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Theory-agnostic searches for non-gravitational modes in black hole ringdown

MPS-Authors
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Forteza,  Xisco Jimenez
Observational Relativity and Cosmology, AEI-Hannover, MPI for Gravitational Physics, Max Planck Society;

/persons/resource/persons216224

Westerweck,  Julian
Observational Relativity and Cosmology, AEI-Hannover, MPI for Gravitational Physics, Max Planck Society;

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2408.08956.pdf
(Preprint), 5MB

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Citation

Crescimbeni, F., Forteza, X. J., Bhagwat, S., Westerweck, J., & Pani, P. (in preparation). Theory-agnostic searches for non-gravitational modes in black hole ringdown.


Cite as: https://hdl.handle.net/21.11116/0000-000F-CDE4-9
Abstract
In any extension of General Relativity (GR), extra fundamental degrees of
freedom couple to gravity. Besides deforming GR forecasts in a theory-dependent
way, this coupling generically introduces extra modes in the gravitational-wave
signal. We propose a novel theory-agnostic test of gravity to search for these
nongravitational modes in black hole merger ringdown signals. To leading order
in the GR deviations, their frequencies and damping times match those of a test
scalar or vector field in a Kerr background, with only amplitudes and phases as
free parameters. This test will be highly valuable for future detectors, which
will achieve signal-to-noise ratios higher than 100 (and as high as 1000 for
space-based detectors such as LISA). Such sensitivity will allow measurement of
these modes with amplitude ratios as low as 0.05 for ground-based detectors
(and as low as 0.008 for LISA), relative to the fundamental mode, enabling
stringent agnostic constraints or detection of scalar/vector modes. By applying
this test to GW150914, GW190521, and GW200129, we find that the current
evidence for an extra mode is comparable to that for the first gravitational
overtone, but its inclusion modifies the inferred remnant spin.