Mergers of hairy black holes: Constraining topological couplings from entropy
arXiv:2405.10127 · doi:10.1103/PhysRevD.110.064032
Abstract
Hairy black-holes are a unique prediction of certain theories that extend General Relativity (GR) with a scalar field. The presence of scalar hair is reflected non-trivially in the entropy of the black hole along with any topological coupling that may be present in the action. Demanding that a system of two merging black holes obeys the global second law of thermodynamics imposes a bound on this topological coupling coefficient. In this work we study how this bound is pushed from its GR value by the presence of scalar hair by considering estimates of binary black-hole merger parameters through inference studies of both mock and real gravitational-wave (GW) events. Although the scalar charge may produce a statistically significant deviation of the change in entropy over the GR prediction, we find no evidence of this happening in the data from real GW events taken from GWTC-1. We also find the entropy change to be susceptible to biases arising out of GW inferences which ends up being two orders of magnitude larger, therefore overwhelming any change, if at all, induced by the scalar hair.
arXiv comment11 pages, 6 figures. Published version
References in corpus (29)
- Observation of Gravitational Waves from a Binary Black Hole Merger
- GWTC-1: A Gravitational-Wave Transient Catalog of Compact Binary Mergers Observed by LIGO and Virgo during the First and Second Observing Runs
- Black Hole Entropy is Noether Charge
- Some Properties of Noether Charge and a Proposal for Dynamical Black Hole Entropy
- GWTC-3: Compact Binary Coalescences Observed by LIGO and Virgo During the Second Part of the Third Observing Run
- Bilby: A user-friendly Bayesian inference library for gravitational-wave astronomy
- Properties of the Binary Black Hole Merger GW150914
- On Renormalization Group Flows in Four Dimensions
- Frequency-domain gravitational waves from non-precessing black-hole binaries. I. New numerical waveforms and anatomy of the signal
- Theoretical Physics Implications of the Binary Black-Hole Mergers GW150914 and GW151226
- Spontaneous scalarization of black holes and compact stars from a Gauss-Bonnet coupling
- New Gauss-Bonnet black holes with curvature induced scalarization in the extended scalar-tensor theories
- Black hole hair in generalized scalar-tensor gravity
- Black hole hair in generalized scalar-tensor gravity: An explicit example
- A no-hair theorem for the galileon
- Spin-induced black hole spontaneous scalarization
- Slowly-Rotating Black Holes in Einstein-Dilaton-Gauss-Bonnet Gravity: Quadratic Order in Spin Solutions
- Testing the black-hole area law with GW150914
- Challenging the Presence of Scalar Charge and Dipolar Radiation in Binary Pulsars
- Constraints on Einstein-dilaton-Gauss-Bonnet gravity from Black Hole-Neutron Star Gravitational Wave Events
- Topological deformation of isolated horizons
- Second Law Violations in Lovelock Gravity for Black Hole Mergers
- Black Hole Thermodynamics: General Relativity and Beyond
- The Second Law in 4D Einstein-Gauss-Bonnet Gravity
- Probing string-inspired gravity with the inspiral-merger-ringdown consistency tests of gravitational waves
- Enhanced Instability of de Sitter Space in Einstein-Gauss-Bonnet Gravity
- Systematic effects from black hole-neutron star waveform model uncertainties on the neutron star equation of state
- Constraining the topological Gauss-Bonnet coupling from GW150914
- No logarithmic corrections to entropy in shift-symmetric Gauss-Bonnet gravity