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A pipeline to search for signatures of line-of-sight acceleration in gravitational wave signals produced by compact binary coalescences

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arxiv 2506.22272 v3 pith:FNXDFP5Q submitted 2025-06-27 astro-ph.HE gr-qc

Avinash Tiwari , Aditya Vijaykumar , Shasvath J. Kapadia , Shrobana Ghosh , Alex B. Nielsen This is my paper
classification astro-ph.HEgr-qc
keywords binarysignaturesgravitationalorderaccelerationbinariesblackcoalescences
verification ladder T0 review T1 audit T2 compute T3 formal
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abstract

Compact binary coalescences (CBCs), such as merging binary black holes (BBHs), binary neutron stars (BNSs), or neutron star black holes (NSBHs), hosted by dense stellar environments, could produce gravitational waves (GWs) that contain signatures of line-of-sight acceleration (LOSA) imparted by the environment's gravitational potential. We calculate the Post-Newtonian (PN) corrections to the $(2,\,2)$ mode GW phase due to a finite LOSA, starting from the leading order at -4 PN below the quadrupole order, up to 3.5 PN above the leading order correction. We do so for binaries whose component spins are aligned with the orbital angular momentum, as well as for binaries with non-zero tidal deformation. We implement these corrections into the LIGO-Virgo-Kagra (LVK) collaboration's flagship parameter estimation (PE) software Bilby_tgr. We study the systematics associated with recovering LOSAs. We find that, when the injection and recovery waveform models are identical, LOSAs are recovered as expected. We test the robustness of the pipeline against waveforms with strong higher-mode signatures or signatures of beyond-general-relativistic (beyond-GR) effects, to delimit the range of applicability of our GR-consistent quasi-circular LOSA-corrected waveforms.

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Cited by 6 Pith papers

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

  1. Joint inference of line-of-sight acceleration and orbital eccentricity in neutron-star--black-hole binaries

    gr-qc 2026-06 unverdicted novelty 7.0 of 10

    All five NSBH events are consistent with zero line-of-sight acceleration; the joint posterior for GW200105_162426 disfavors both zero LOSA and zero eccentricity at 90% credibility.

  2. Line-of-sight acceleration in compact binaries with higher harmonics and eccentricity

    gr-qc 2026-06 unverdicted novelty 5.0 of 10

    Implements consistent line-of-sight acceleration corrections in quasi-circular and eccentric GW waveform models, applies them to GWTC-3 events, and reports no substantial evidence for acceleration while warning of bia...

  3. Testing the nature of GW200105 by probing the frequency evolution of eccentricity

    astro-ph.HE 2025-09 conditional novelty 5.0 of 10

    GW200105's recovered eccentricity as a function of frequency is consistent with the general-relativistic decay law at 68% confidence, supporting the eccentric-orbit interpretation.

  4. GWTC-4.0: Tests of General Relativity. II. Parameterized Tests

    gr-qc 2026-03 accept novelty 4.0 of 10

    Analysis of GWTC-4.0 events finds no evidence for deviations from General Relativity and improves bounds on parameterized post-Newtonian coefficients by factors of 1.2-5.5 plus graviton mass limit to 1.92e-23 eV/c2.

  5. GWTC-4.0: Tests of General Relativity. II. Parameterized Tests

    gr-qc 2026-03 conditional novelty 4.0 of 10

    Across 91 compact-binary mergers, eight parameterized tests of general relativity return null results, with a new 90% upper bound on the graviton mass of 1.92×10^-23 eV/c².

  6. On the Presence of a Tertiary Compact Object in GW190814

    gr-qc 2026-05 accept novelty 3.0 of 10

    Extended-data Bayesian reanalysis of GW190814 finds no evidence for tertiary-induced line-of-sight acceleration or residual eccentricity due to strong degeneracy between the two effects.

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