ECO signatures from the Weyl-induced gravitational waveform injection

TL;DR

This paper models gravitational waves from oscillating stars in a Weyl background, revealing curvature effects that could produce detectable signals in LIGO data, suggesting possible signatures of exotic compact objects.

Contribution

It introduces a novel Weyl-based model for gravitational wave emission from oscillating stars, incorporating curvature-induced redshifts and waveform trapping effects.

Findings

Waveforms exhibit primary components due to wave trapping.

Injected signals are near LIGO's detection threshold.

Results are consistent with signatures of exotic compact objects.

Abstract

We investigate gravitational wave emission from an oscillating star modeled in a static Weyl background using a modulated waveform ansatz. First, we revisit the Weyl metric and obtain a Bessel-type curvature solution with regularity and asymptotic flatness conditions compatible for an astrophysical compact object. Second, we model an oscillating star-like object with a perfect fluid as a source of gravitational radiation. A modified wave equation with curvature-induced redshifts is solved numerically leading to a waveform that produces primary components due to wave trapping. This signal is injected into real LIGO data for GW150914 and compared across detectors allowing the detectability of curvature-induced gravitational waveform in the threshold of LIGO's sensitivity, consistent with an exotic compact object (ECO).