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Title: Effective field theory of black hole quasinormal modes in scalar-tensor theories

Journal Article · · Journal of High Energy Physics (Online)
 [1];  [2];  [3]; ORCiD logo [4];  [5]
  1. Center for Astroparticle Physics (CAP), Geneva (Switzerland)
  2. Columbia Univ., New York, NY (United States)
  3. Carnegie Mellon Univ., Pittsburgh, PA (United States)
  4. Univ. of Utrecht (Netherlands)
  5. Scuola Normale Superiore, Pisa (Italy); Istituto Nazionale di Fisica Nucleare (INFN), Pisa (Italy)

The final ringdown phase in a coalescence process is a valuable laboratory to test General Relativity and potentially constrain additional degrees of freedom in the gravitational sector. We introduce here an effective description for perturbations around spherically symmetric spacetimes in the context of scalar-tensor theories, which we apply to study quasi-normal modes for black holes with scalar hair. We derive the equations of motion governing the dynamics of both the polar and the axial modes in terms of the coefficients of the effective theory. Assuming the deviation of the background from Schwarzschild is small, we use the WKB method to introduce the notion of “light ring expansion”. This approximation is analogous to the slow-roll expansion used for inflation, and it allows us to express the quasinormal mode spectrum in terms of a small number of parameters. This work is a first step in describing, in a model independent way, how the scalar hair can affect the ringdown stage and leave signatures on the emitted gravitational wave signal. Potential signatures include the shifting of the quasi-normal spectrum, the breaking of isospectrality between polar and axial modes, and the existence of scalar radiation.

Research Organization:
Univ. of Pennsylvania, Philadelphia, PA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), High Energy Physics (HEP); Netherlands organization for scientifi c research (NWO); National Aeronautics and Space Administration (NASA)
Grant/Contract Number:
SC0013528; NXX16AB27G; SC0011941
OSTI ID:
1612000
Journal Information:
Journal of High Energy Physics (Online), Vol. 2019, Issue 2; ISSN 1029-8479
Publisher:
Springer BerlinCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 41 works
Citation information provided by
Web of Science

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Cited By (16)

Testing gravity with the two-body problem preprint January 2020
Stealth black holes in shift symmetric kinetic gravity braiding journal January 2020
Perturbations of a rotating black hole in DHOST theories text January 2019
Effective field theory of hairy black holes and their flat and de Sitter limits journal September 2019
Equivalence principle on cosmological backgrounds in scalar–tensor theories journal October 2019
Equivalence Principle on Cosmological Backgrounds in Scalar-Tensor Theories text January 2019
Spontaneous scalarization of black holes in the Horndeski theory journal May 2019
Black Hole Ringdown as a Probe for Dark Energy text January 2019
Parametrized ringdown spin expansion coefficients: a data-analysis framework for black-hole spectroscopy with multiple events text January 2019
Forecasts for low spin black hole spectroscopy in Horndeski gravity journal May 2019
Parametrized black hole quasinormal ringdown. II. Coupled equations and quadratic corrections for nonrotating black holes text January 2019
Stealth black hole perturbations in kinetic gravity braiding journal July 2021
Forecasts for Low Spin Black Hole Spectroscopy in Horndeski Gravity text January 2019
Perturbations of a rotating black hole in DHOST theories journal November 2019
Quantum sensor networks as exotic field telescopes for multi-messenger astronomy text January 2020
Spontaneous scalarization of black holes in the Horndeski theory text January 2019

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