Bianchi Type V Magnetized String Dust Universe with Variable Magnetic Permeability
|
|
- Georgiana Brooks
- 5 years ago
- Views:
Transcription
1 EJTP 5, No. 19 (008) Electronic Journal of Theoretical Physics Bianchi Type V Magnetized String Dust Universe with Variable Magnetic Permeability Raj Bali Department of Mathematics, University of Rajasthan, Jaipur-30004, India Received 18 August 008, Accepted 0 September 008, Published 10 October 008 Abstract: Bianchi Type V magnetized string dust universe with variable magnetic permeability is investigated. The magnetic field is due to an electric current produced along x-axis. Thus F 3 is the only non-vanishing component of electro-magnetic field tensor F ij. Maxwell s equations F [ij;k] =0,F ij ;j = 0 are satisfied by F 3 = constant. The physical and geometrical aspects of the model with singularity in the model are discussed.the physical implications of the model are also explained. c Electronic Journal of Theoretical Physics. All rights reserved. Keywords: Bianchi V, Magnetized, String Dust, Variable Magnetic Permeability PACS (008): z; Cq, q; k 1. Introduction Bianchi Type V universes are the natural generalization of FRW (Friedmann-Robertson- Walker) models with negative curvature. These open models are favoured by the available evidences for low density universes (Gott et al [1]). Bianchi Type V cosmological model where matter moves orthogonally to the hyper surface of homogeneity, has been studied by Heckmann and Schucking[]. Exact tilted solutions for the Bianchi Type V space-time are obtained by Hawking[3], Grishchuk et al. [4]. Ftaclas and Cohen[5] have investigated LRS (Locally Rotationally Symmetric) Bianchi Type V universes containing stiff matter with electromagnetic field. Lorentz[6] has investigated LRS Bianchi Type V tilted models with stiff perfect fluid and electromagnetic field. Roy and Singh [7] have investigated a Bianchi Type V universe with stiff fluid and a source free electromagnetic field. Banerjee and Sanyal [8] have investigated Bianchi Type V cosmological models with viscosity and heat flow. Coley [9] has investigated Biachi type V imperfect fluid cosmological models in General Relativity. Nayak and Sahoo [10] have investigated Bianchi type V models with balir5@yahoo.co.in
2 106 Electronic Journal of Theoretical Physics 5, No. 19 (008) matter distribution admitting anisotropic pressure and heat flow. Bali and Meena[11] have investigated Bianchi Type V tilted cosmological model for stiff perfect fluid distribution. Cosmic string play a significant role in the study of the early universe. These strings arise during the phase transitions after the big-bang explosion. Linde [1]conjectured that universe might have experienced a number of phase transitions after the big-bang explosions. The phase transitions produce vacuum domain structure such as domain walls, strings and monopoles(kibble[13], Zel dovich[14]). Cosmic strings create a considerable interest as these act as a gravitational lenses and give rise to density perturbations leading to the formation of galaxies (Vilekin[15]). These strings have stress energy and they can be classified as massive and geometrical strings. Each massive string is formed by geometric string with particles attached along its extension. This is the interesting situations wherein we have particles and strings together. The pioneering work in the formulation of the energy-momentum tensor for classical massive strings is due to Letelier[16] Who explained that the massive strings are formed by geometric string(stachel[17]) with particles attached along its extension. Letelier[18] first used this idea in finding some cosmological solutions for massive strings for Bianchi Type I and Kantowski-Sachs spacetime. Melvin[19] in his cosmological solution for dust and electromagnetic field suggested that during the evolution of the universe, the matter was in a highly ionized state and is smoothly coupled with the field. Hence the presence of magnetic field in string dust universe is not unrealistic. Banerjee et al.[0] have investigated an axially symmetric Bianchi Type I string dust cosmological model in presence and absence of magnetic field. A class of cosmological solutions of massive strings has been derived by Chakraborty[1] for Bianchi Type VI 0 space-time. Tikekar and Patel [,3]have investigated cosmological models in Biachi Type III and VI 0 space-times in presence and absence of magnetic field. Patel and Maharaj[4] investigated stationary rotating world model with magnetic field. Singh and Singh [5] have investigated string cosmological models with magnetic field in the context of space-time with G3 symmetry. Wang [6] has investigated massive string cosmological model in presence of magnetic field in the context of Bianchi Type III space-time.bali and Upadhaya [7]have investigated LRS(Locally Rotationally Symmetric)Bianchi Type I string dust magnetized cosmological models using the condition that σ (shear) is proportional to the expansion (θ). Bali and Anjali [8]have investigated Bianchi Type I magnetized string dust cosmological model using supplementary condition between metric potentials A, B, Cas A =(BC) n, n being a constant. Recently Bali et al.[9]have investigated Bianchi Type I massive string cosmological model with magnetic field for Barotropic perfect fluid distribution. In the above mentioned studies, the magnetic permeability where it is considered, is assumed as constant quantity. In this paper, we have investigated Bianchi Type V string dust universe in the presence of magnetic field with variable magnetic permeability. To get the deterministic model, we have assumed thatf 3 is the only non-vanishing component off ij. The physical implications of the model are also discussed.
3 Electronic Journal of Theoretical Physics 5, No. 19 (008) Formation of Field Equations We consider Bianchi Type V space-time in the form ds = dt + A dx + B e x dy + C e x dz (1) where A, B,C are functions of t. The energy-momentum tensor (T j i ) for a cloud of string is given by Letelier[16] T j i = ρv i v j λx i x j + E j i () where v i and x i satisfy the conditions v i v i = x i x i = 1,v i x i =0, x 1 0,x = x 3 = x 4 (3) ρ being the proper energy density for a cloud of string with particles attached to them,λ the string tension density, v i the four-velocity of the particles and x i is a unit space-like vector representing the direction of string. If the particle density of the configuration is denoted by ρ p then we have ρ = ρ p + λ (4) In a comoving coordinate system, we have E is electromagnetic field given by Lichnerowicz [30] as v i =(0, 0, 0, 1),x i =(1/A, 0, 0, 0) (5) E j i = μ [ h ( v i v j +1/g j i ) hi h j] (6) with g h i = μ ɛ ijklf kl v j (7) Where h i is the magnetic flux vector, ɛ ijkl the Levi-Civita tensor, F kl the electromagnetic field tensor, μ the magnetic permeability and h = h l h l, g ij the metric tensor. We assume that magnetic field is due to an electric current produced along x-axis. Thus F 3 is the only non-vanishing component of electromagnetic field tensorf ij and h 1 0,h =0=h 3 = h 4. Maxwell s equations F ij;k + F jk;i + F ki;j = o and F ij ;j = 0 are satisfied by F 3 = H(constant) (8) We also find that F 14 = 0 = F 4 = F 34 due to the assumption of infinite electrical conductivity(roy Maartens[31]). From equation (7), we find that h 1 = AHe x μbc (9)
4 108 Electronic Journal of Theoretical Physics 5, No. 19 (008) Using equation (9) in (6), we have The Einstein s field equations E 1 1 = H e 4x μb C = E = E 3 3 = E 4 4 (10) R j i 1/Rgj i = 8πT j i (11) for the line-element (1) with equations (), (5) and (10) lead to the following system of equations B 44 B + C 44 C + B 4C 4 BC 1 ( ) H A =8π B C + λ (1) A 44 A + C 44 C + A 4C 4 AC 1 ( ) H A = 8π (13) B C A 44 A + B 44 B + A 4B 4 AB 1 ( ) H A = 8π (14) B C A 4 B 4 AB + A 4C 4 AC + B 4C 4 BC 3 ) (ρ A =8π + H (15) B C A 4 A B 4 B C 4 C = 0 (16) where we have assumed that magnetic permeability is a variable quantity and assumed as μ = e 4x (17) Thus μ 0asx and μ = 1 when x 0, Zel dovich[14] in his investigation has explained that ρ s /ρ c where ρ s is the mass density and ρ c the critical density then strings frozen in plasma would change their density like a i.e. like t 1 in the radiation dominated universe where a is the radius of the universe. In this approximation, the strings would soon be dominant and the tension along the string (λ) is equal to its energy density (ρ) per unit length and the particle density (ρ p ) of the configuration is zero. Thus from equation (4) we have string dust condition as ρ = λ 3. Solution of Field Equations Equations (1) and (15) after using string dust condition ρ = λ lead to B 44 B + C 44 C A ( 4 B4 A B + C ) 4 + C A = 0 (18) Equation (16) leads to A 4 A = 1 ( B4 B + C ) 4 C (19)
5 Electronic Journal of Theoretical Physics 5, No. 19 (008) which on integration leads to where L is the constant of integration. Equation (19) leads to where A 44 A = B 44 B + C 44 C 1 From equations (13) and (14), we have A 44 A + B 44 B + C 44 C + A 4 A Using equations (0) and (1) in (), we have A = L BC (0) B 4 C 4 B 1 C + B 4C 4 BC ( B4 B + C 4 C (1) ) A = K () B C K =8πH (3) Let us assume B 44 B + C 44 C + B 4C 4 BC 1 L BC = K (4) B C BC = μ, B C = ν (5) Using equation (5)in (18)and (4), we have μ 44 μ μ 4 μ + ν 4 4ν + 1 L μ = 0 (6) and μ 44 μ μ 4 4μ + ν 4 4ν 1 L μ = K (7) μ Equations (6) and (7) lead to μ 44 +1/4μ 4 = 8 L K μ (8) which leads to f =( dμ dt ) = 4 L μ K + N μ where μ 4 = f(μ), μ 44 = ff, f = df dμ and N is the constant of integration. From equations (13), (14) and (19), we have B 44 B C 44 C + 1 ( B4 B + C 4 C which after using the condition (5)leads to ν 4 ν = (9) )( B4 B C ) 4 = 0 (30) C l Lμ 3/ (31)
6 110 Electronic Journal of Theoretical Physics 5, No. 19 (008) which again leads to dν ν = l dt dμ Lμ 3/ dμ (3) where l is the constant of integration. Equation (3) after using (9) leads to [ ] α + tan θ/ 4γ l/l αk L ν = M K α tan θ/+ 4γ L K (33) where tan θ/ is determined by (4T L K) tan θ/ = +(L 4 K +4NL ) 1 (4T L K) (34) and K = 1 L (35) Hence the metric (1) reduces to the form ( ) dt ds = dμ + L μdx + μνe x dy + μ dμ ν ex dz dt = + TdX + Tνe X 4T K + N L dy + T ν e X L dz L T where Lx = X, y = Y,z = Z, μ = T and ν is given by (33). In the absence of magnetic field i.e. when K 0 then the metric (36) reduces to the form ds = dt 4T L + N T + TdX + Tνe X L dy + T ν e X L dz where ν is determined by (33)in absence of magnetic field as [ ] l/α α + tan θ/ 4γ ν = M (38) α tan θ/+4γ and tan θ/ in the absence of magnetic field is given by (34) as 16T +4NL tan θ/ = 1 (39) 4T The energy density (ρ), the string tension density (λ),the scalar of expansion(θ) and the shear (σ) for the model (36) in the presence of magnetic field, are given by ( 3N 8πρ = 4 M ) 1 4 T K 3 T =8πλ (40) θ = A 4 A + B 4 B + C 4 C 4 =3 L T + N T K (41) 3 T l σ = (4) LT 3/ (36) (37)
7 Electronic Journal of Theoretical Physics 5, No. 19 (008) The energy condition ρ 0 leads to 0 <T 3N M 64πK Conclusions The model (36) starts with a big-bang at T = 0 and the expansion in the model decreases as time increases. When T 0 then ρ and when T then ρ 0. Since σ 0 when T then the model isotropizes for large values of T. There is a Point type singularity in the model (36) at T = 0 (MacCallum[3]). The scale factor R is given by R 3 = ABCe x = Le x T 3/ Thus R increases as T increases. The deceleration parameter (q) is given by q = R/R Ṙ /R ( ) K 4N T = ( 4T ) (43) K + N L T The decelaration parameter approaches the value -1 as in de-sitter universe when 5N + 4T =4K T L In the absence of magnetic field i.e. when K 0,The energy density (ρ), the string tension density (λ),the scalar of expansion (θ) and the shear (σ) for the model (37), are given by ( 3N 8πρ = 4 M ) 1 4 T 3 =8πλ (44) 4 θ =3 L T + N (45) T 3 l σ = (46) LT 3/ The energy condition ρ 0 leads to 3N M. The model (37) in the absence of magnetic field, starts with a big-bang at T =0 and the expansion in the model decreases as time increases. Since σ 0 when T. Therefore the model isotropizes for large values of T.The scale factor R is given by R 3 = Le x T 3/ Thus R increases as T increases. The deceleration parameter (q) in the absence of magnetic field is given by q = R/R Ṙ /R = 4N/T 4T L + N T Thus the decelaration parameter approaches the value -1 as in de-sitter universe if 5NL + 4T =0.
8 11 Electronic Journal of Theoretical Physics 5, No. 19 (008) Acknowledgement The author is thankful to the Inter-University Center for Astronomy and Astrophysics (IUCAA), Pune, India for providing facility and support where this work was carried out. References [1] Gott, J.R., Gunn, J.E., Schramn, D.N. and Tinsley,B.M Astrophys. J [] Heckmann,O. and Schucking, E.196, In Gravitation:An Introduction to Current Research ed.witten,l.(john Wiley, NewYork) [3] Hawking, S.W Mon. Not. R. Astron. Soc [4] Grishchuk, L.P., Doroshkevich, A.G. and Novikov, I.D Sov.Phys. JETP [5] Ftaclas, C. and Cohen, J.M Phys. Rev D [6] Lorentz, D Gen. Relat. Gravit. 13, 795 [7] Roy, S.R. and Singh, J.P Aust. J. Phys [8] Banerjee, A. and Sanyal,A.K Gen.Relati. Grav [9] Coley,A.A Gen.Relati.Grav. 3 [10] Nayak, B.K. and Sahoo, B.K Gen.Relati.Grav.8 51 [11] Bali, R. and Meena, B.L. 005 Proc. Nat. Acad. Sci. India, 75(A) IV 73 [1] Linde,A.B Rep.Prog.Phys. 4 5 [13] Kibble, T.W.B J. Phys. A.:Math. Gen [14] Zel dovich, Ya.B Mon.Not.Roy.Astron.Soc [15] Velenkin, A. 198 Phys. Rev D 4 08 [16] Letelier, P.S Phys. Rev D [17] Stachel, J Phys. Rev D [18] Letelier, P.S Phys. Rev D [19] Melvin, M.A Ann. New York Acad.Sci 6 53 [0] Banerjee, A.,Sanyal, A.K. and Chakravorty,S Pamana - J. Phys [1] Chakravorty, S Ind. J. Pure and Applied Phys [] Tikekar, R. and Patel, L.K. 199 Gen. Rel. Grav [3] Tikekar, R. and Patel, L.K Pramana - J. Phys [4] Patel, L.K. and Maharaj, S.D Pramana - J. Phys [5] Singh, G.P. and Singh, T Gen. Rel. Grav [6] Wang, X.X. 006 Chin. Phys. Lett [7] Bali,R. and Upadhaya, R.D. 003 Astrophys. and Space-Science 83 97
9 Electronic Journal of Theoretical Physics 5, No. 19 (008) [8] Bali, R. and Anjali 006 Astrophys. and Space-Science [9] Bali, R., Pareek, U.K. and Pradhan, A. 007 Chin.Phys. Lett [30] Lichnerowicz,A Relativistic Hydrodynamics and Magneto Hydrodynamics, Benjamin, NewYork, p.13 [31] Roy, Maartens 000 Pramana-J.Phys [3] MacCallum, M.A.H Comm. Math.Phys
10
Bianchi Type-VI Bulk Viscous Fluid String Cosmological Model in General Relativity
Bulg. J. Phys. 38 2011 14 14 Bianchi Type-VI Bulk Viscous Fluid String Cosmological Model in General Relativity S.P. Kandalkar 1, P.P. Khade 2, S.P. Gawande 1 1 Department of Mathematics, Government Vidarbha
More informationInternational Journal of Applied and Universal Research E-ISSN No: Volume III, Issue V, Sept-Oct Available online at:
COSMOLOGICAL MODELS BIANCHI TYPE II WITH BULK VISCOSITY IN GENERAL THEORY OF RELATIVITY R.K. Dubey 1, Shishir Kumar Srivastava 2, Dhirendra Tripathi 3 1 Department of Mathematics Govt. S.K.N.P.G. College,
More informationInternational Journal of Applied and Universal Research ISSN No: Volume III, Issue II, Mar-Apr Available online at:
BIANCHI TYPE III ELECTRO MAGNETIZED COSMOLOGICAL MODEL WITH NAMBU STRINGS IN GENERAL THEORY OF RELATIVITY R.K.Dubey 1, Anil Saini 2, Neelam Yadav 3 1 Department of Mathematics, Govt. SKN PG College Mauganj
More informationBianchi Type VI0 Inflationary Universe with Constant Deceleration Parameter and Flat Potential in General Relativity
Advances in Astrophysics, Vol., No., May 7 https://dx.doi.org/.66/adap.7. 67 Bianchi ype VI Inflationary Universe with Constant Deceleration Parameter and Flat Potential in General Relativity Raj Bali
More informationMagnetized Anisotropic Bianchi Type-VI Cosmological Model Containing Dark Energy
IOSR Journal of pplied Physics (IOSR-JP) e-issn: 78-486Volume 0, Issue Ver II (Jan eb 08), PP 3-35 wwwiosrjournalsorg Magnetized nisotropic Bianchi Type-VI Cosmological Model Containing Dark Energy Mukunda
More informationResearch Article LRS Bianchi Type II Massive String Cosmological Models with Magnetic Field in Lyra s Geometry
Advances in Mathematical Physics Volume 201, Article ID 89261, 5 pages http://dx.doi.org/10.1155/201/89261 Research Article LR Bianchi Type II Massive tring Cosmological Models with Magnetic Field in Lyra
More informationSome LRS Bianchi Type VI 0 Cosmological Models with Special Free Gravitational Fields
EJTP 6, No. 21 (2009 165 174 Electronic Journal of Theoretical Physics Some LRS ianchi Type VI 0 Cosmological Models with Special Free Gravitational Fields Raj ali 1, Ratna anerjee 2 and S.K.anerjee 3
More informationBianchi-IX string cosmological model in Lyra geometry
PRAMANA cfl Indian Academy of Sciences Vol. 60, No. 6 journal of June 200 physics pp. 115 1159 Bianchi-IX string cosmological model in Lyra geometry F RAHAMAN 1;2, S CHAKRABORTY 2, N BEGUM 1, M HOSSAIN
More informationA Magnetized Kantowski-Sachs Inflationary Universe in General Relativity
Bulg. J. Phys. 37 (2010) 144 151 A Magnetized Kantowski-Sachs Inflationary Universe in General Relativity S.D. Katore PG Department of Mathematics, SGB Amravati University, Amravati, India Received 10
More informationBianchi Type VIII Inflationary Universe with Massless Scalar Field in General Relativity
August 05 Volume 6 Issue 8 pp. 679-68 Bali,. & Swati, Bianchi Type VIII Inflationary Universe with Massless Scalar Field in General elativity Bianchi Type VIII Inflationary Universe with Massless Scalar
More informationString Fluid Cosmological Model with Magnetic Field in Bimetric Theory of Gravitation
Available at http://pvamu.edu/aam Appl. Appl. Math. ISSN: 1932-9466 Vol. 9, Issue 1 (June 2014), pp. 246-259 Applications and Applied Mathematics: An International Journal (AAM) String Fluid Cosmological
More informationLocally-rotationally-symmetric Bianchi type-v cosmology in general relativity
PRAMANA c Indian Academy of Sciences Vol. 72, No. 2 journal of February 2009 physics pp. 429 443 Locally-rotationally-symmetric Bianchi type-v cosmology in general relativity C P SINGH Department of Applied
More informationBianchi Type-VI0Dark Energy Cosmological Models in General Relativity
Global Journal of Science Frontier Research Mathematics and Decision Sciences Volume 12 Issue 12 Version 1.0 Type : Double Blind Peer Reviewed International Research Journal Publisher: Global Journals
More informationNEW EXACT SOLUTION OF BIANCHI TYPE V COSMOLOGICAL STIFF FLUID MODEL IN LYRA S GEOMETRY
ASTROPHYSICS NEW EXACT SOLUTION OF BIANCHI TYPE V COSMOLOGICAL STIFF FLUID MODEL IN LYRA S GEOMETRY VINEET K. YADAV 1,, LALLAN YADAV 2, ANIL KUMAR YADAV 3 1,2 Department of Physics, D. D. U. Gorahpur University,
More informationSOME LRS BIANCHI TYPE-I COSMOLOGICAL MODELS WITH ZERO-MASS SCALAR FIELD
SOME LRS BIANCHI TYPE-I COSMOLOGICAL MODELS WITH ZERO-MASS SCALAR FIELD By Purushottam R.B.S. Yadav Manish Kumar Deptt. of Mathematics P.G. Deptt. of Mathematics P.G. Deptt. of Mathematics Nalanda College
More informationTheoretical Models of the Brans-Dicke Parameter for Time Independent Deceleration Parameters
Theoretical Models of the Brans-Dicke Parameter for Time Independent Deceleration Parameters Sudipto Roy 1, Soumyadip Chowdhury 2 1 Assistant Professor, Department of Physics, St. Xavier s College, Kolkata,
More informationSTRING COSMOLOGICAL MODELS IN BIANCHI TYPE-III SPACE-TIME WITH BULK VISCOSITY AND Λ TERM
Jan. 05. Vol. 6. No. 0 0-05 ES & F. ll rights reserved ISSN05-869 STIN OSMOLOIL MODELS IN BINHI TYPE-III SPE-TIME WITH BULK VISOSITY ND Λ TEM PEETI SONI SPN SHIMLI search Scholar Department of Mathematics
More informationBianchi Type-III Inflationary Universe with Constant Deceleration Parameter in General Relativity
Bulg. J. Phys. 38 2011 139 1 Bianchi Type-III Inflationary Universe with Constant Deceleration Parameter in General Relativity S.D. Katore Department of Mathematics, S.G.B. Amravati University, Amravati
More informationUniformity of the Universe
Outline Universe is homogenous and isotropic Spacetime metrics Friedmann-Walker-Robertson metric Number of numbers needed to specify a physical quantity. Energy-momentum tensor Energy-momentum tensor of
More informationBianchi Type-VI Inflationary Universe in General Relativity
March 01 Vol. 3 Issue 5 pp. 7-79 Katore S. D. & Chopade B. B. Bianchi Type-VI Inflationary Universe in General Relativity Bianchi Type-VI Inflationary Universe in General Relativity 7 Article Shivdas.
More informationHypersurface-homogeneous cosmological models with anisotropic dark energy in Saez Ballester theory of gravitation
Pramana J. Phys. (207) 88: 8 DOI 0.007/s204-06-7-4 c Indian Academy of Sciences Hypersurface-homogeneous cosmological models with anisotropic dark energy in Saez Ballester theory of gravitation MVERMA,
More informationA higher-dimensional Bianchi type-i inflationary Universe in general relativity
PRAMANA c Indian Academy of Sciences Vol. 78, No. 1 journal of January 01 physics pp. 101 107 A higher-dimensional Bianchi type-i inflationary Universe in general relativity SDKATORE 1,, K S ADHAV 1, V
More informationA PLANE-SYMMETRIC MAGNETIZED INHOMOGENEOUS COSMOLOGICAL MODEL OF PERFECT FLUID DISTRIBUTION WITH VARIABLE MAGNETIC PERMEABILITY
PLNE-SYMMETRIC MGNETIZED INHOMOGENEOUS COSMOLOGICL MODEL OF PERFECT FLUID DISTRIBUTION WITH VRIBLE MGNETIC PERMEBILITY NIRUDH PRDHN, RCHN SINGH, R. S. SINGH Department of Mathematics, Hindu Post-graduate
More informationAnisotropic Lyra cosmology
PRAMANA c Indian Academy of Sciences Vol. 62, No. 6 journal of June 2004 physics pp. 87 99 B B BHOWMIK and A RAJPUT 2 Netaji Subhas Vidyaniketan Higher Secondary School, Basugaon 783 372, Dist. Kokrajhar,
More informationInflationary Universe Scenario in Bianchi Type VI 0 Space Time with Flat Potential and Bulk Viscosity in General Relativity
IOS Journal of pplied Physics (IOS-JP) e-issn: 78-86.Volume 9, Issue Ver. I (Jan. Feb. 07), PP -0 www.iosrjournals.org Inflationary Universe Scenario in ianchi Type VI 0 Space Time with Flat Potential
More informationarxiv:gr-qc/ v1 20 May 2005
EMERGENT UNIVERSE IN STAROBINSKY MODEL arxiv:gr-qc/0505103v1 20 May 2005 S. Mukherjee and B.C. Paul Physics Department, North Bengal University Dist : Darjeeling, PIN : 734 430, India. S. D. Maharaj Astrophysics
More informationAnisotropic Bianchi Type-I Magnetized String Cosmological Models with Decaying Vacuum Energy Density Λ(t)
Commun. Theor. Phys. 55 011 931 941 Vol. 55, No. 5, May 15, 011 Anisotropic Bianchi Type-I Magnetized String Cosmological Models with Decaying Vacuum Energy Density Λt Anirudh Pradhan Department of Mathematics,
More informationNew Non-Diagonal Singularity-Free Cosmological Perfect-Fluid Solution
New Non-Diagonal Singularity-Free Cosmological Perfect-Fluid Solution arxiv:gr-qc/0201078v1 23 Jan 2002 Marc Mars Departament de Física Fonamental, Universitat de Barcelona, Diagonal 647, 08028 Barcelona,
More informationSELF-SIMILAR PERFECT FLUIDS
SELF-SIMILAR PERFECT FLUIDS J. CAROT and A.M. SINTES Departament de Física, Universitat de les Illes Balears, E-07071 Palma de Mallorca, Spain Space-times admitting an r-parameter Lie group of homotheties
More informationBIANCHI TYPE I ANISOTROPIC UNIVERSE WITHOUT BIG SMASH DRIVEN BY LAW OF VARIATION OF HUBBLE S PARAMETER ANIL KUMAR YADAV
BIANCHI TYPE I ANISOTROPIC UNIVERSE WITHOUT BIG SMASH DRIVEN BY LAW OF VARIATION OF HUBBLE S PARAMETER ANIL KUMAR YADAV Department of Physics, Anand Engineering College, Keetham, Agra -282 007, India E-mail:
More informationGeneral Relativity and Cosmology Mock exam
Physikalisches Institut Mock Exam Universität Bonn 29. June 2011 Theoretische Physik SS 2011 General Relativity and Cosmology Mock exam Priv. Doz. Dr. S. Förste Exercise 1: Overview Give short answers
More informationAnisotropic Dark Energy Bianchi Type III Cosmological Models in Brans Dicke Theory of Gravity
arxiv:106.0391v1 [gr-qc] Jun 01 Anisotropic Dark Energy Bianchi Type III Cosmological Models in Brans Dicke Theory of Gravity M. Farasat Shamir and Akhlaq Ahmad Bhatti Department of Sciences and Humanities,
More informationExact Solution of an Ekpyrotic Fluid and a Primordial Magnetic Field in an Anisotropic Cosmological Space-Time of Petrov D
Advanced Studies in Theoretical Physics Vol. 11, 2017, no. 12, 601-608 HIKARI Ltd, www.m-hikari.com https://doi.org/10.12988/astp.2017.7835 Exact Solution of an Ekpyrotic Fluid and a Primordial Magnetic
More informationGeometrical Behaviuors of LRS Bianchi Type-I Cosmological Model
EJTP 6, No. 22 (2009) 79 84 Electronic Journal of Theoretical Physics Geometrical Behaviuors of LRS Bianchi Type-I Cosmological Model Hassan Amirhashchi 1, Hishamuddin Zainuddin 2 and Hamid Nil Saz Dezfouli
More informationBianchi Type IX Magnetized Bulk Viscous String Cosmological Model in General Relativity
4 Theoretical Physics, Vol., No., March 07 htts://dx.doi.org/0.606/t.07.003 ianchi Tye IX Magnetized ulk Viscous String Cosmological Model in General Relativity V. G. Mete, V. D. Elkar, V.S. Deshmukh 3
More informationThermodynamics and emergent universe
Thermodynamics and emergent universe Saumya Ghosh a, Sunandan Gangopadhyay a,b a Indian Institute of Science Education and Research Kolkata Mohanpur 741246, Nadia, West Bengal, India b Visiting Associate
More informationResearch Article Bianchi Types II, VIII, and IX String Cosmological Models with Bulk Viscosity in a Theory of Gravitation
International cholarly Research Network IRN Mathematical Physics Volume 2012, Article ID 341612, 15 pages doi:10.5402/2012/341612 Research Article Bianchi Types II, VIII, and IX tring Cosmological Models
More informationPLANE SYMMETRIC UNIVERSE WITH COSMIC STRING AND BULK VISCOSITY IN SCALAR TENSOR THEORY OF GRAVITATION 1. INTRODUCTION
PLANE SYMMETRIC UNIVERSE WITH COSMIC STRING AND BULK VISCOSITY IN SCALAR TENSOR THEORY OF GRAVITATION S.D. KATORE, A.Y. SHAIKH Department of Mathematics, S.G.B. Amravati University, Amravati-60, India
More informationInternational Journal of Emerging Technologies in Computational and Applied Sciences (IJETCAS)
International Association of Scientific Innovation and Research (IASIR) (An Association Unifying the Sciences, Engineering, and Applied Research) International Journal of Emerging Technologies in Computational
More informationAn introduction to General Relativity and the positive mass theorem
An introduction to General Relativity and the positive mass theorem National Center for Theoretical Sciences, Mathematics Division March 2 nd, 2007 Wen-ling Huang Department of Mathematics University of
More informationHypersurface-homogeneous Universe filled with perfect fluid in f(r, T) theory of gravity
Pramana J. Phys. (6) 87: 83 DOI.7/s43-6-99- c Indian Academy of Sciences Hypersurface-homogeneous Universe filled with perfect fluid in f(r, T) theory of gravity A Y SHAIKH, and S D KATORE Department of
More informationElectromagnetic spikes
Electromagnetic spikes Ernesto Nungesser (joint work with Woei Chet Lim) Trinity College Dublin ANZAMP, 29th of November, 2013 Overview Heuristic picture of initial singularity What is a Bianchi spacetime?
More informationGravitational collapse and the vacuum energy
Journal of Physics: Conference Series OPEN ACCESS Gravitational collapse and the vacuum energy To cite this article: M Campos 2014 J. Phys.: Conf. Ser. 496 012021 View the article online for updates and
More informationAre naked singularities forbidden by the second law of thermodynamics?
Are naked singularities forbidden by the second law of thermodynamics? Sukratu Barve and T. P. Singh Theoretical Astrophysics Group Tata Institute of Fundamental Research Homi Bhabha Road, Bombay 400 005,
More informationarxiv:gr-qc/ v1 5 Oct 1999
TOTAL ENERGY OF THE BIANCHI TYPE I UNIVERSES S. S. Xulu Department of Applied Mathematics, University of Zululand, Private Bag X1001, 3886 Kwa-Dlangezwa, South Africa Abstract arxiv:gr-qc/9910015v1 5 Oct
More informationarxiv:gr-qc/ v1 17 Dec 1996
Classes of Anisotropic Cosmologies of Scalar-Tensor Gravitation Diego F. Torres Departamento de Física - Universidad Nacional de La Plata C.C. 67, C. P. 1900, La Plata, Buenos Aires, Argentina arxiv:gr-qc/9612048v1
More informationDynamics of Bianchi type-vi 0 holographic dark energy models in general relativity and Lyra s geometry
Pramana J. Phys. (2017) 88: 0 DOI 10.1007/s1204-016-18-z c Indian Academy of Sciences Dynamics of Bianchi type-vi 0 holographic dark energy models in general relativity and Lyra s geometry S D KATORE and
More informationAstronomy, Astrophysics, and Cosmology
Astronomy, Astrophysics, and Cosmology Luis A. Anchordoqui Department of Physics and Astronomy Lehman College, City University of New York Lesson VI March 15, 2016 arxiv:0706.1988 L. A. Anchordoqui (CUNY)
More informationGeometrical models for spheroidal cosmological voids
Geometrical models for spheroidal cosmological voids talk by: Osvaldo M. Moreschi collaborator: Ezequiel Boero FaMAF, Universidad Nacional de Córdoba, Instituto de Física Enrique Gaviola (IFEG), CONICET,
More informationLRS Bianchi Type I Cosmological Model with Bulk Viscosity in Lyra Geometry
Bulg. J. Phys. 4 (5 4 5 LRS Bianchi Type I Cosmological Model with Bulk Viscosity in Lyra Geometry S.P. Kandalkar, S. Samdurkar Department of Mathematics, Govt. Vidarbha Institute of Science & Humanities,
More informationSome Bianchi Type Cosmological Models in f(r) Gravity
arxiv:1006.4249v1 [gr-qc] 22 Jun 2010 Some Bianchi Type Cosmological Models in f(r) Gravity M. arasat Shamir Department of Mathematics, University of the Punjab, Quaid-e-Azam Campus, Lahore-54590, Pakistan.
More informationCosmology: An Introduction. Eung Jin Chun
Cosmology: An Introduction Eung Jin Chun Cosmology Hot Big Bang + Inflation. Theory of the evolution of the Universe described by General relativity (spacetime) Thermodynamics, Particle/nuclear physics
More informationModified generalized Chaplygin gas model in Bianchi type-v space-time geometry with dynamical G and
Journal of Physics: Conference Series PAPER OPEN ACCESS Modified generalized Chaplygin gas model in Bianchi type-v space-time geometry with dynamical G and To cite this article: S Kotambkar et al 015 J.
More informationThird Year: General Relativity and Cosmology. 1 Problem Sheet 1 - Newtonian Gravity and the Equivalence Principle
Third Year: General Relativity and Cosmology 2011/2012 Problem Sheets (Version 2) Prof. Pedro Ferreira: p.ferreira1@physics.ox.ac.uk 1 Problem Sheet 1 - Newtonian Gravity and the Equivalence Principle
More informationDYNAMIC COSMOLOGICAL CONSTANT IN BRANS DICKE THEORY
DYNAMIC COSMOLOGICAL CONSTANT IN BRANS DICKE THEORY G P SINGH, AY KALE, J TRIPATHI 3 Department of Mathematics, Visvesvaraya National Institute of Technology, Nagpur - 44, India Department of Mathematics,
More informationPHYM432 Relativity and Cosmology 17. Cosmology Robertson Walker Metric
PHYM432 Relativity and Cosmology 17. Cosmology Robertson Walker Metric Cosmology applies physics to the universe as a whole, describing it s origin, nature evolution and ultimate fate. While these questions
More informationFRW UNIVERSE WITH VARIABLE G AND Λ TERM IN f(r,t ) GRAVITY
FRW UNIVERSE WITH VARIABLE G AND Λ TERM IN f(r,t ) GRAVITY G. P. SINGH a, BINAYA K. BISHI b Department of Mathematics, Visvesvaraya National Institute of Technology Nagpur, Nagpur-440010, India E-mail:
More informationarxiv:gr-qc/ v1 22 May 2006
1 Can inhomogeneities accelerate the cosmic volume expansion? 1 Tomohiro Kai, 1 Hiroshi Kozaki, 1 Ken-ichi Nakao, 2 Yasusada Nambu and 1 Chul-Moon Yoo arxiv:gr-qc/0605120v1 22 May 2006 1 Department of
More informationGravitation: Cosmology
An Introduction to General Relativity Center for Relativistic Astrophysics School of Physics Georgia Institute of Technology Notes based on textbook: Spacetime and Geometry by S.M. Carroll Spring 2013
More informationAstr 2320 Tues. May 2, 2017 Today s Topics Chapter 23: Cosmology: The Big Bang and Beyond Introduction Newtonian Cosmology Solutions to Einstein s
Astr 0 Tues. May, 07 Today s Topics Chapter : Cosmology: The Big Bang and Beyond Introduction Newtonian Cosmology Solutions to Einstein s Field Equations The Primeval Fireball Standard Big Bang Model Chapter
More informationOn the Geometry of Planar Domain Walls. F. M. Paiva and Anzhong Wang y. Abstract. The Geometry of planar domain walls is studied.
On the Geometry of Planar Domain Walls F. M. Paiva and Anzhong Wang y Departmento de Astrofsica, Observatorio Nacional { CNPq, Rua General Jose Cristino 77, 091-400 Rio de Janeiro { RJ, Brazil Abstract
More informationarxiv:gr-qc/ v2 7 Sep 2005
Energy of the Universe in Bianchi-type I Models in Møller s Tetrad Theory of Gravity arxiv:gr-qc/0505079v2 7 Sep 2005 1. Introduction Oktay Aydoğdu 1 and Mustafa Saltı 2 Department of Physics, Faculty
More informationOn the occasion of the first author s seventieth birthday
METHODS AND APPLICATIONS OF ANALYSIS. c 2005 International Press Vol. 12, No. 4, pp. 451 464, December 2005 006 HOW INFLATIONARY SPACETIMES MIGHT EVOLVE INTO SPACETIMES OF FINITE TOTAL MASS JOEL SMOLLER
More informationarxiv:gr-qc/ v2 28 Nov 2005
Derivation of the Raychaudhuri Equation arxiv:gr-qc/0511123v2 28 Nov 2005 Naresh Dadhich Inter-University Centre for Astronomy & Astrophysics, Post Bag 4, Pune 411 007, India E-mail: nkd@iucaa.ernet.in
More informationDynamics of a Charged Spherically Symmetric Thick Shell
EJTP 3, No. 12 (2006) 145 150 Electronic Journal of Theoretical Physics Dynamics of a Charged Spherically Symmetric Thick Shell A. Eid Department of Astronomy, Faculty of Science, Cairo University, Egypt
More informationBlack Hole Universe with Rotation Chan Park KAIST
Black Hole Universe with Rotation 2016.01.02. Chan Park KAIST Motivation FLRW cosmology Highly symmetric assumption : spatial homogeneity and isotropy Metric ds 2 = dt 2 + a 2 t a t : scale factor Friedmann
More informationIntroduction to Inflation
Introduction to Inflation Miguel Campos MPI für Kernphysik & Heidelberg Universität September 23, 2014 Index (Brief) historic background The Cosmological Principle Big-bang puzzles Flatness Horizons Monopoles
More informationIn the expanding Universe, a comoving volume element expands along with the cosmological flow, getting physically larger over time.
Cosmological models In the expanding Universe, a comoving volume element expands along with the cosmological flow, getting physically larger over time. The expansion is described by the scale factor R(t).
More informationOddities of the Universe
Oddities of the Universe Koushik Dutta Theory Division, Saha Institute Physics Department, IISER, Kolkata 4th November, 2016 1 Outline - Basics of General Relativity - Expanding FRW Universe - Problems
More informationarxiv: v3 [gr-qc] 23 Sep 2015
On the viability of the truncated Israel-Stewart theory in cosmology Dmitry Shogin, Per Amund Amundsen, and Sigbjørn Hervik Faculty of Science and Technology, University of Stavanger, N-4036 Stavanger,
More information1. De Sitter Space. (b) Show that the line element for a positively curved FRW model (k = +1) with only vacuum energy (P = ) is
1. De Sitter Space (a) Show in the context of expanding FRW models that if the combination +3P is always positive, then there was a Big Bang singularity in the past. [A sketch of a(t) vs.t may be helpful.]
More informationCMB Tensor Anisotropies in Metric f (R) Gravity
CMB Tensor Anisotropies in Metric f (R) Gravity Hassan Bourhrous,, Álvaro de la Cruz-Dombriz, and Peter Dunsby, Astrophysics, Cosmology and Gravity Centre (ACGC), University of Cape Town, 7701 Rondebosch,
More informationSOME EXACT BIANCHI TYPE-I COSMOLOGICAL MODELS IN SCALAR-TENSOR THEORY OF GRAVITATION WITH TIME DEPENDENT DECELERATION PARAMETER
SOME EXACT BIANCHI TYPE-I COSMOLOGICAL MODELS IN SCALAR-TENSOR THEORY OF GRAVITATION WITH TIME DEPENDENT DECELERATION PARAMETER ANIRUDH PRADHAN 1, ANAND SHANKAR DUBEY 2, RAJEEV KUMAR KHARE 3 1 Department
More informationA Study of the Variable Equation-of-State Parameter in the Framework of Brans-Dicke Theory
International Journal of Pure and Applied Physics. ISSN 0973-1776 Volume 13, Number 3 (2017), pp. 279-288 Research India Publications http://www.ripublication.com A Study of the Variable Equation-of-State
More informationCanadian Journal of Physics. Anisotropic solution in phantom cosmology via Noether symmetry approach
Anisotropic solution in phantom cosmology via Noether symmetry approach Journal: Canadian Journal of Physics Manuscript ID cjp-2017-0765.r2 Manuscript Type: Article Date Submitted by the Author: 07-Dec-2017
More informationRelativity, Gravitation, and Cosmology
Relativity, Gravitation, and Cosmology A basic introduction TA-PEI CHENG University of Missouri St. Louis OXFORD UNIVERSITY PRESS Contents Parti RELATIVITY Metric Description of Spacetime 1 Introduction
More informationarxiv:gr-qc/ v1 9 Mar 2000
CAN A KASNER UNIVERSE WITH A VISCOUS COSMOLOGICAL FLUID BE ANISOTROPIC? I. Brevik 1 arxiv:gr-qc/0003039v1 9 Mar 2000 Division of Applied Mechanics, Norwegian University of Science and Technology, N-7491
More informationCosmology. April 13, 2015
Cosmology April 3, 205 The cosmological principle Cosmology is based on the principle that on large scales, space (not spacetime) is homogeneous and isotropic that there is no preferred location or direction
More informationPhysics 133: Extragalactic Astronomy ad Cosmology
Physics 133: Extragalactic Astronomy ad Cosmology Lecture 4; January 15 2014 Previously The dominant force on the scale of the Universe is gravity Gravity is accurately described by the theory of general
More informationNature of Singularities in (n+2)-dimensional Gravitational Collapse of Vaidya Space-time in presence of monopole field.
Nature of Singularities in (n+2)-dimensional Gravitational Collapse of Vaidya Space-time in presence of monopole field. 1 C. S. Khodre, 2 K. D.Patil, 3 S. D.Kohale and 3 P. B.Jikar 1 Department of Mathematics,
More informationIntroduction to Cosmology
Introduction to Cosmology João G. Rosa joao.rosa@ua.pt http://gravitation.web.ua.pt/cosmo LECTURE 2 - Newtonian cosmology I As a first approach to the Hot Big Bang model, in this lecture we will consider
More informationA873: Cosmology Course Notes. II. General Relativity
II. General Relativity Suggested Readings on this Section (All Optional) For a quick mathematical introduction to GR, try Chapter 1 of Peacock. For a brilliant historical treatment of relativity (special
More informationIs Matter an emergent property of Space-Time?
Is Matter an emergent property of Space-Time? C. Chevalier and F. Debbasch Université Pierre et Marie Curie-Paris6, UMR 8112, ERGA-LERMA, 3 rue Galilée, 94200 Ivry, France. chevalier claire@yahoo.fr, fabrice.debbasch@gmail.com
More informationExamining the Viability of Phantom Dark Energy
Examining the Viability of Phantom Dark Energy Kevin J. Ludwick LaGrange College 12/20/15 (11:00-11:30) Kevin J. Ludwick (LaGrange College) Examining the Viability of Phantom Dark Energy 12/20/15 (11:00-11:30)
More informationSize of a hydrogen atom in the expanding universe
Class. Quantum Grav. 16 (1999) 1313 131. Printed in the UK PII: S064-9381(99)977-1 Size of a hydrogen atom in the expanding universe W B Bonnor Queen Mary and Westfield College, London E1 4NS Received
More informationarxiv:gr-qc/ v1 6 Nov 2006
Different faces of the phantom K.A. Bronnikov, J.C. Fabris and S.V.B. Gonçalves Departamento de Física, Universidade Federal do Espírito Santo, Vitória, ES, Brazil arxiv:gr-qc/0611038v1 6 Nov 2006 1. Introduction
More informationMATHEMATICAL TRIPOS Part III PAPER 53 COSMOLOGY
MATHEMATICAL TRIPOS Part III Wednesday, 8 June, 2011 9:00 am to 12:00 pm PAPER 53 COSMOLOGY Attempt no more than THREE questions. There are FOUR questions in total. The questions carry equal weight. STATIONERY
More informationInflation and Cosmic Strings in Heterotic M-theory
Inflation and Cosmic Strings in Heterotic M-theory Melanie Becker Texas A&M July 31st, 2006 Talk at the Fourth Simons Workshop in Mathematics and Physics Stony Brook University, July 24 - August 25, 2006
More informationPropagation of Gravitational Waves in a FRW Universe. What a Cosmological Gravitational Wave may look like
Propagation of Gravitational Waves in a FRW Universe in other words What a Cosmological Gravitational Wave may look like by Kostas Kleidis (kleidis@astro.auth.gr) INTRODUCTION & MOTIVATION What are we
More informationGeneral relativity and the Einstein equations
April 23, 2013 Special relativity 1905 Let S and S be two observers moving with velocity v relative to each other along the x-axis and let (t, x) and (t, x ) be the coordinate systems used by these observers.
More informationarxiv:gr-qc/ v1 9 Aug 2006
Nonlinear spinor field in Bianchi type-i cosmology: accelerated regimes Bijan Saha arxiv:gr-qc/0608047v1 9 Aug 2006 Laboratory of Information Technologies Joint Institute for Nuclear Research, Dubna 141980
More informationSCIENTIFIC UNDERSTANDING OF THE ANISOTROPIC UNIVERSE IN THE WARPED PRODUCTS SPACETIME FOR AEROSPACE POWER. Jaedong Choi
Korean J. Math. 23 (2015) No. 3 pp. 479 489 http://dx.doi.org/10.11568/kjm.2015.23.3.479 SCIENTIFIC UNDERSTANDING OF THE ANISOTROPIC UNIVERSE IN THE WARPED PRODUCTS SPACETIME FOR AEROSPACE POWER Jaedong
More informationBIANCHI TYPE-III COSMOLOGICAL MODEL WITH VARIABLE G AND Λ-TERM IN GENERAL RELATIVITY
BIANCHI TYPE-III COSMOLOGICAL MODEL WITH VARIABLE G AND Λ-TERM IN GENERAL RELATIVITY HASSAN AMIRHASHCHI 1, H. ZAINUDDIN 2,a, ANIRUDH PRADHAN 2,3 1 Young Researchers Club, Mahshahr Branch, Islamic Azad
More informationarxiv: v1 [gr-qc] 22 Jul 2015
Spinor Field with Polynomial Nonlinearity in LRS Bianchi type-i spacetime Bijan Saha arxiv:1507.06236v1 [gr-qc] 22 Jul 2015 Laboratory of Information Technologies Joint Institute for Nuclear Research 141980
More informationarxiv: v2 [gr-qc] 25 Jan 2010
Astrophysics and Space Science DOI 10.1007/s - - - de Sitter expansion with anisotropic fluid in Bianchi type-i space-time Özgür Akarsu 1 Can Battal Kılınç arxiv:1001.0550v [gr-qc] 5 Jan 010 c Springer-Verlag
More informationCosmological Implications of Spinor-Torsion Coupling
Cosmological Implications of Spinor-Torsion Coupling Nikodem J. Popławski Department of Physics, Indiana University, Bloomington, IN Astrophysics-Relativity Seminar Department of Physics and Astronomy
More informationAddendum: Symmetries of the. energy-momentum tensor
Addendum: Symmetries of the arxiv:gr-qc/0410136v1 28 Oct 2004 energy-momentum tensor M. Sharif Department of Mathematics, University of the Punjab, Quaid-e-Azam Campus Lahore-54590, PAKISTAN. Abstract
More informationNon-static local string in Brans Dicke theory
PRAMANA cfl Indian Academy of Sciences Vol. 55, No. 3 journal of September 2 physics pp. 369 374 Non-static local string in Brans Dicke theory AASEN Λ Relativity and Cosmology Research Centre, Department
More informationNumber-Flux Vector and Stress-Energy Tensor
Massachusetts Institute of Technology Department of Physics Physics 8.962 Spring 2002 Number-Flux Vector and Stress-Energy Tensor c 2000, 2002 Edmund Bertschinger. All rights reserved. 1 Introduction These
More informationBianchiTypeVICosmologicalModelwithQuadraticformofTimeDependentTerminGeneralRelativity
Global Journal of Science Frontier Research: A Physics and Space Science Volume 16 Issue 6 Version 1.0 Year 2016 Type : Double Blind Peer Reviewed International Research Journal Publisher: Global Journals
More information