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Scalar-tensor mixed polarization search of gravitational waves

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arxiv 2105.00253 v2 pith:2HPN3Y36 submitted 2021-05-01 gr-qc

Hiroki Takeda , Soichiro Morisaki , Atsushi Nishizawa This is my paper · ORCID
classification gr-qc
keywords gravityamplitudegravitationalbinaryconstraintsgw170814gw170817lesssim
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abstract

An additional scalar degree of freedom for a gravitational wave is often predicted in theories of gravity beyond general relativity and can be used for a model-agnostic test of gravity. In this letter, we report the direct search for the scalar-tensor mixed polarization modes of gravitational waves from compact binaries in a strong regime of gravity by analyzing the data of GW170814 and GW170817, which are the merger events of binary black holes and binary neutron stars, respectively. Consequently, we obtain the constraints on the ratio of scalar-mode amplitude to tensor-mode amplitude: $\lesssim 0.20$ for GW170814 and $\lesssim 0.068$ for GW170817, which are the tightest constraints on the scalar amplitude in a strong regime of gravity before merger.

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Cited by 4 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. Full citation record

  1. Gravitational waves in Cubic Metric-Affine Gravity

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    New exact pp-wave solutions in cubic metric-affine gravity have dynamical torsion and nonmetricity and cause a scalar polarization mode in gravitational waves.

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    gr-qc 2025-01 conditional novelty 6.0 of 10

    A backward search in time from known gravitational wave detections could detect or constrain superluminal non-tensor polarizations, and the authors argue this is feasible with current detectors.

  3. Statistical biases in parametrized searches for gravitational-wave polarizations

    gr-qc 2025-01 conditional novelty 6.0 of 10

    In simulated LIGO/Virgo analyses, high-SNR event selection biases the inferred inclination angle and, for nonzero true values, inflates the estimated scalar dipole amplitude Ab1.

  4. Hawking area law in quantum gravity

    gr-qc 2026-04 unverdicted novelty 5.0 of 10

    If Hawking's area law is taken as exact, nonlocal and Stelle quantum-gravity theories are forced to drop R^2 and (Riemann)^2 terms (or use singular Ricci-flat black holes), and the standard entropy-area law follows as...

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