England's Fortress

Hopper, Andrew D; Major, Philip

doi:10.4324/9781315579689

Cited by 1 publication

(1 citation statement)

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“…In particular, the time derivative of the Zerilli function has a source which falls off as r −3 p at large distance, making it far more efficient than the Zerilli variable. In an upcoming work [56] the relation between all these master functions will be explored and the specific details of their sources will be given.…”

Section: Thin-shell Gravastarsmentioning

confidence: 99%

Gravitational-wave signatures of exotic compact objects and of quantum corrections at the horizon scale

et al. 2016

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Gravitational waves from binary coalescences provide one of the cleanest signatures of the nature of compact objects. It has been recently argued that the post-merger ringdown waveform of exotic ultracompact objects is initially identical to that of a black-hole, and that putative corrections at the horizon scale will appear as secondary pulses after the main burst of radiation. Here we extend this analysis in three important directions: (i) we show that this result applies to a large class of exotic compact objects with a photon sphere for generic orbits in the test-particle limit; (ii) we investigate the late-time ringdown in more detail, showing that it is universally characterized by a modulated and distorted train of "echoes"of the modes of vibration associated with the photon sphere; (iii) we study for the first time equal-mass, head-on collisions of two ultracompact boson stars and compare their gravitational-wave signal to that produced by a pair of black-holes. If the initial objects are compact enough as to mimic a binary black-hole collision up to the merger, the final object exceeds the maximum mass for boson stars and collapses to a black-hole. This suggests that -in some configurations -the coalescence of compact boson stars might be almost indistinguishable from that of black-holes. On the other hand, generic configurations display peculiar signatures that can be searched for in gravitational-wave data as smoking guns of exotic compact objects. arXiv:1608.08637v2 [gr-qc]

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Section: Thin-shell Gravastarsmentioning

confidence: 99%