Kent Yagi BLACK HOLE SOLUTION AND BINARY GRAVITATIONAL WAVES IN DYNAMICAL CHERN-SIMONS GRAVITY. (Montana State University)
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1 BLACK HOLE SOLUTION AND BINARY GRAVITATIONAL WAVES IN DYNAMICAL CHERN-SIMONS GRAVITY University of Tokyo November 13 th 2012 Kent Yagi (Montana State University) Collaborators: Nicolas Yunes (Montana State Univ.) Takahiro Tanaka (YITP)
2 Contents 1 Introduction 2 Black Hole Solutions 3 Gravitational Waves from BH Binaries 4 Summary & Future Work
3 Contents 1 Introduction 2 Black Hole Solutions 3 Gravitational Waves from BH Binaries 4 Summary & Future Work
4 Probing alternative theories of gravity using compact binaries Why modifications of gravity? (I) Problems within GR can be naturally solved. (II) Classical gravitational theory as a low-energy effective theory of a more fundamental theory e.g. superstring theory Chern-Simons, Gauss-Bonnet, Scalar-tensor theories
5 Testing GR (I) Weak field, non-dynamical regime: Solar System Binary Pulsar (II) Strong field, dynamical regime: Gravitational Waves
6 Dynamical Chern-Simons Gravity -Standard Model -Superstring Theory -Loop Quantum Gravity -Inflation
7 Action: Dynamical Chern-Simons Gravity -Standard Model -Superstring Theory -Loop Quantum Gravity -Inflation
8 Action: Dynamical Chern-Simons Gravity -Standard Model -Superstring Theory -Loop Quantum Gravity -Inflation Field Eqs.:
9 Action: Dynamical Chern-Simons Gravity -Standard Model -Superstring Theory -Loop Quantum Gravity -Inflation Field Eqs.: Characteristic Length Scale:
10 -Standard Model -Superstring Theory Action: Dynamical Chern-Simons Gravity -Loop Quantum Gravity -Inflation Field Eqs.: Characteristic Length Scale: Small coupling approximation Dimensionless coupling constant: For simplicity, we set
11 Corrections to GWs from BH Binaries (I) Dissipative Scalar & Gravitational Radiation Modifies the orbital evolution (II) Conservative Modified BH Solution Modifies the binding energy Modifies the binary orbit
12 Dissipative Corrections in DCS Gravity Non-Spinning BH Pert. PN 7PN effect For the spinning case, the correction is 2PN! Now, we need to compute the conservative one. [KY+ (2012)]
13 Contents 1 Introduction 2 Black Hole Solutions 3 Gravitational Waves from BH Binaries 4 Summary & Future Work
14 (I) Non-Spinning Spherical Symmetry No CS correction Schwarzschild BH
15 (I) Non-Spinning Spherical Symmetry GPB (II) Spinning No CS correction Schwarzschild BH -Exact Solution unknown. -Linear order in spin [Yunes & Pretorius (2009), Konno et al. (2009)] frame-dragging effect Gravity Probe B [Ali-Haimoud & Chen (2011)]
16 BH Solution at Quadratic Order in Spin Metric Perturbation: GR CS
17 BH Solution at Quadratic Order in Spin Metric Perturbation: Expansion in spin: GR CS
18 BH Solution at Quadratic Order in Spin Metric Perturbation: Expansion in spin: GR CS
19 BH Solution at Quadratic Order in Spin Metric Perturbation: Expansion in spin: GR CS
20 BH Solution at Quadratic Order in Spin Metric Perturbation: Expansion in spin: GR CS Yunes & Pretorius, Konno et al.
21 BH Solution at Quadratic Order in Spin Metric Perturbation: Expansion in spin: GR CS v Yunes & Pretorius, Konno et al. New!!
22 BH Solution at Quadratic Order in Spin Metric Perturbation: Expansion in spin: GR CS v Yunes & Pretorius, Konno et al. New!! Field Eqs.: at order (2,2)
23 BH Solution at Quadratic Order in Spin Metric Perturbation: Expansion in spin: GR CS v Yunes & Pretorius, Konno et al. New!! Field Eqs.: at order (2,2) Known functions
24 BH Solution at Quadratic Order in Spin Metric Perturbation: Expansion in spin: GR CS v Yunes & Pretorius, Konno et al. New!! Field Eqs.: at order (2,2) v Perturbation under Schw. BH Known functions
25 BH Solution at Quadratic Order in Spin Metric Perturbation: Expansion in spin: GR CS v Yunes & Pretorius, Konno et al. New!! Field Eqs.: at order (2,2) v Perturbation under Schw. BH Known functions Spherical harmonic decomposition decouples
26 The New Metric [KY+ (2012)]
27 Contents 1 Introduction 2 Black Hole Solutions 3 Gravitational Waves from BH Binaries 4 Summary & Future Work
28 GWs from BH Binaries in CS Gravity parameterized post-einsteinian waveform: Yunes & Pretorius (2009)
29 GWs from BH Binaries in CS Gravity parameterized post-einsteinian waveform: Yunes & Pretorius (2009) CS Gravity: 2PN correction Amplitude 加速膨張による補正 GR CS Binary GW time
30 GW DETECTORS amplitude SMBH IMBH stellar-mass BH LISA DECIGO/BBO adv. LIGO KAGRA ET
31 Results: Adv. LIGO, KAGRA Constraints on Spins are known a priori Colored Region: total mass [KY+ (2012)]
32 Results: Adv. LIGO, KAGRA Constraints on Spins are known a priori Colored Region: total mass [KY+ (2012)]
33 Results: Adv. LIGO, KAGRA Constraints on Spins are known a priori Colored Region: The bound roughly corresponds to the BH horizon size. total mass [KY+ (2012)]
34 Results: Adv. LIGO, KAGRA Constraints on Spins are known a priori Colored Region: The bound roughly corresponds to the BH horizon size. Solar system: total mass [KY+ (2012)]
35 Results: Adv. LIGO, KAGRA Constraints on Spins are known a priori Colored Region: The bound roughly corresponds to the BH horizon size. Solar system: total mass [KY+ (2012)] 7 orders of magnitude stronger constraint than the solar system bound!!
36 Results: Other Detectors spin (anti-)aligned binaries (Spins are included into parameters.)
37 Contents 1 Introduction 2 Black Hole Solutions 3 Gravitational Waves from BH Binaries 4 Summary & Future Work
38 -New BH Solution to quadratic order in spin 2PN Conservative Correction -PN Scheme 2PN Dissipative Correction First self-consistent BH Binary gravitational waveforms 2 nd generation ground-based interferometers 7 orders of magnitude stronger constraint than the solar system bound!! Future Work - Precessing BH binaries - Bayesian analysis, more realistic detector noises - Modeling NSs in dynamical CS gravity Current constraints from double binary pulsar obs.
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