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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Spicing up the recipe for echoes from exotic compact objects: Orbital differences and corrections in rotating backgrounds

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Micchi, Luis Felipe Longo [1] ; Chirenti, Cecilia [2, 3, 4]
Total Authors: 2
[1] Univ Fed ABC, Ctr Ciencias Nat & Humanas, BR-09210170 Santo Andre, SP - Brazil
[2] Univ Maryland, Dept Astron, College Pk, MD 20742 - USA
[3] Univ Fed ABC, Ctr Matemat Comp & Cognicao, BR-09210170 Santo Andre, SP - Brazil
[4] NASA, Ctr Res & Explorat Space Sci & Technol, GSFC, Greenbelt, MD 20771 - USA
Total Affiliations: 4
Document type: Journal article
Source: Physical Review D; v. 101, n. 8 APR 3 2020.
Web of Science Citations: 0

Recently, it has been argued that near-horizon modifications of the standard (classical) black hole spacetime could lead to observable alterations of the gravitational waveform generated by a binary black hole coalescence. Such modifications can be inspired by quantum gravity considerations, resulting in speculative horizonless exotic compact objects (ECOs) with no singularities, which may be an alternative to the classical black hole solution. A largely model-independent description of these objects proposed in the literature relies on the introduction of a partially reflective wall at some small distance away from the ``would-be{''} horizon. The inspiral-merger ringdown of a pair of such objects would be subject to possibly detectable deviations from the black hole case due to matter effects. In particular, the ringdown phase would be modified by the late emergence of so-called ``echoes{''} in the waveform, but most studies so far have considered spherically symmetric backgrounds. We use an in-falling scalar charge as an initial perturbation to simulate the excitation of the echoes of a rotating ECO, and we explore both the corotating and counterrotating cases, which provide distinct signals. In particular, rotation breaks the symmetry between positive and negative frequencies and introduces a subdominant frequency contribution in each echo, which we examine here for the first time. Our results follow consistently from the solution of the Teukolsky equation using the MST method developed by Mano, Suzuki, and Takasugi and the construction of the complex Green's function integrated over different particle geodesics. (AU)

FAPESP's process: 17/24919-4 - Tests of general relativity with new detections of gravitational waves
Grantee:Luis Felipe Longo Micchi
Support type: Scholarships in Brazil - Doctorate