Gravitation: theory and recent experiments in Hungary

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1 Gravitation: theory and recent experiments in Hungary Astroparticle physics at the RMKI Budapest Theory (gravitation) and Experiment (the VIRGO participation) M. Vasúth Department of Theoretical Physics, RMKI

2 Organization and research RMKI (director: Prof. Z. Szıkefalvi-Nagy) Department of Theoretical Physics (head: Prof. G. Wolf) Group members Gyula Fodor (staff) Péter Forgács (staff) István Rácz (staff) László B. Szabados (staff) Mátyás Vasúth (staff) Tamás Herpay (postdoc) Péter Kovács (postdoc) János Majár (postdoc, university lecturer) Merse E. Gáspár (PhD student) Árpád Lukács (PhD student) Balázs Mikóczi (PhD student) Projects in theory - Mathematical relativity and physics of black holes - Perturbations around black holes - Gravitational radiation (compact binaries, parameter estimation) - Dynamics of extended objects and defects (e.g. cosmic strings) - Physics near magnetars

3 Organization and research RMKI participation in the VIRGO experiment Group leader: István Rácz Group members Gergely Debreczeni (RFFO, VESF postdoc) Mátyás Vasúth (staff) Merse E. Gáspár (PhD student) Gergely Kovács (PhD student) Gábor Endrıczi (staff, engineer) Tamás Ilkei (mechanical engineer) Botond Mézsáros (mechanical engineer) VIRGO activity The VIRGO experiment - Computational tools and algorithms - Gravitational wave templates - Cascina, Italy - Arm length: 3 km m 3, mbar vacuum

4 Organization and research National collaborations National collaborations Eötvös Loránd University University of Szeged Dept. of Atomic Physics Dept. of Theoretical Physics Grants - Hungarian Scientific Research Fund (OTKA) No.: NI K IN VESF post-doctoral fellowship Application of G. Debreczeni

5 VIRGO activity Computational tools and algorithms As a worldwide network of gravitational wave detectors LIGO and VIRGO experiments are working together and share and exchange e.g. software, data and computing resources. Participation in the development of the interconnectivity between different Grid infrastructures: EGI Grid OSG LDG - The recorded scientific data (160 TB/year/IF) of the Interferometers has to be transferred, processed, analyzed, etc. Development and implementation of search algorithms on GPUs (Graphical Processing Units, many core computing), which can be parallelized and/or independent calculations can be performed at the same time. Projects: - Compact binary coalescence search algorithms, - Continuous wave searches (F-statistics, Hough method)

6 VIRGO activity GW templates GridRipper A 4 th order precision Adaptive Mesh Refinement code for solving hyperbolic systems of partial differential equations, e.g. Einstein equations numerically. The following problems are currently investigated: - Gravitational collapse of fluid or scalar field in spherical symmetry - Creation of baby universes - Cosmic inflation - Einstein-Klein-Gordon system in 3D scenarios (multipole expansion) Integration of the (post-newtonian) equations of motion for compact binaries (with eccentricity and rotating components), generation of inspiral waveforms.

7 Theoretical projects Gravitational wave research Motion of spinning compact binaries (as promising sources of gravitational waves) Gravitational waveforms emitted by binaries (on parabolic and hyperbolic orbits) Parameter estimation of (eccentric) binaries (Fisher matrix analysis) for massive black holes (as sources for LISA) Mathematical properties of General Relativity Energy, linear and angular momentum in GR (quasi-local quantities) Higher dimensional black holes Motion and dynamics of relativistic shells Slowly rotating stars in GR circular elliptic δm M

8 Theoretical projects Extended localized objects Dynamics of extended objects (cosmic strings, domain walls) and their interaction with incoming radiation. Applications in cosmology and condensed matter physics (laboratory experiments for the formation of defects) Gravitational effects: - CMB fluctuations (10%) - GW background - Structure formation (voids, filaments) Time dependent, spatially localized states in massive scalar field theories (oscillons) coupled to gravity (oscillaton). Possible candidates for Dark Matter (solutions with lifetimes comparable to that of the Universe)

9 Theoretical projects Physics near magnetars Detecting high energy neutrinos, reaching the Earth in their original form, can give us a chance to test the different models e.g. for dark matter, supernovas, gamma ray burst, neutron stars, magnetars. As a possible source for present neutrino observations (IceCube, South Pole) we study pion (subsequent neutrino) radiation by protons accelerated in the strong electromagnetic field of magnetars. IceCube detector can detect neutrinos up to ev Magnetars: Neutron stars with strong (B G) magnetic field Casey Reed, Pennstate University

10 Thank you for your attention!

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