Analytical model for gravitational-wave echoes from spinning remnants

  title={Analytical model for gravitational-wave echoes from spinning remnants},
  author={Elisa Maggio and Adriano Testa and Swetha Bhagwat and Paolo Pani},
  journal={Physical Review D},
Gravitational-wave echoes in the post-merger signal of a binary coalescence are predicted in various scenarios, including near-horizon quantum structures, exotic states of matter in ultracompact stars, and certain deviations from general relativity. The amplitude and frequency of each echo is modulated by the photon-sphere barrier of the remnant, which acts as a spin- and frequency-dependent high-pass filter, decreasing the frequency content of each subsequent echo. Furthermore, a major… 

Figures and Tables from this paper

Echoes from backreacting exotic compact objects

The possible detection of echoes in late gravitational-wave signals is the most promising way to test horizonless alternatives to general relativistic black holes, and probe the physics of these

Gravitational wave echoes induced by a point mass plunging into a black hole

Recently, the possibility of detecting gravitational wave echoes in the data stream subsequent to the binary black hole mergers observed by LIGO was suggested. Motivated by this suggestion, we

Gravitational wave echo spectra

Exotic compact objects may resemble black holes very closely while remaining horizonless. They may be distinguished from black holes because they effectively give rise to a resonant cavity for the

Fredholm approach to characterize gravitational wave echoes

Gravitational waves are a sensitive probe into the structure of compact astronomical objects and the nature of gravity in the strong regime. Modifications of near-horizon physics can imprint on the

Gravitational Waves, Holography, and Black Hole Microstates

Gravitational wave observations of the near-horizon region of black holes lend insight into the quantum nature of gravity. In particular, gravitational wave echoes have been identified as a potential

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

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

Oscillations in the extreme mass-ratio inspiral gravitational wave phase correction as a probe of a reflective boundary of the central black hole

We discuss the energy loss due to gravitational radiation of binaries composed of exotic objects whose horizon boundary conditions are replaced with reflective ones. Our focus is on the extreme

Modeling and detecting resonant tides of exotic compact objects

The event horizon of a black hole in general relativity absorbs all infalling radiation. Any observation of the contrary would immediately challenge the expectation that astrophysical black holes are

How loud are echoes from exotic compact objects?

The first direct observations of gravitational waves by the LIGO collaboration have motivated different tests of general relativity (GR), including the search for extra pulses following the GR

Tidal heating as a discriminator for horizons in extreme mass ratio inspirals

The defining feature of a classical black hole is being a perfect absorber. Any evidence showing otherwise would indicate a departure from the standard black-hole picture. Energy and angular momentum



Analytical template for gravitational-wave echoes: Signal characterization and prospects of detection with current and future interferometers

Gravitational-wave echoes in the post-merger ringdown phase are under intense scrutiny as probes of near-horizon quantum structures and as signatures of exotic states of matter in ultracompact stars.

Parameter estimation of gravitational wave echoes from exotic compact objects

Relativistic ultracompact objects without an event horizon may be able to form in nature and merge as binary systems, mimicking the coalescence of ordinary black holes. The postmerger phase of such

On gravitational-wave echoes from neutron-star binary coalescences

A tentative detection of gravitational-wave echoes in the post-merger signal of GW170817 has been recently claimed at significance level. It has been speculated that the signal might provide evidence

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

Gravitational waves from binary coalescences provide one of the cleanest signatures of the nature of compact objects. It has been recently argued that the postmerger ringdown waveform of exotic

Echoes from quantum black holes

One of the most triumphant predictions of the theory if general relativity was the recent LIGO-Virgo detection of gravitational wave (GW) signals produced in binary black hole (BH) mergers. However,

Characterization of echoes: A Dyson-series representation of individual pulses

The ability to detect and scrutinize gravitational waves from the merger and coalescence of compact binaries opens up the possibility to perform tests of fundamental physics. One such test concerns

Echoes of Kerr-like wormholes

Structure at the horizon scale of black holes would give rise to echoes of the gravitational wave signal associated with the post-merger ringdown phase in binary coalescences. We study the waveform

Echoes from the abyss: a highly spinning black hole remnant for the binary neutron star merger GW170817

The first direct observation of a binary neutron star (BNS) merger was a watershed moment in multi-messenger astronomy. However, gravitational waves from GW170817 have only been observed prior to the

Gravitational wave echoes through new windows

There has been a striking realization that physics underlying the black hole information paradox could imply post-merger gravitational wave echoes. We here report on evidence for echoes in the form

Gravitational wave echo spectra

Exotic compact objects may resemble black holes very closely while remaining horizonless. They may be distinguished from black holes because they effectively give rise to a resonant cavity for the