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

Cardoso, Vítor; Hopper, Seth; Macedo, Caio F. B.; Palenzuela, Carlos; Pani, Paolo

doi:10.1103/physrevd.94.084031

Cited by 514 publications

(598 citation statements)

References 73 publications

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“…Such detections might eventually rule out exotic alternatives to black holes and test quantum effects at the horizon scale [25]. At the moment, the post-merger signal leaves room for alternative theories of gravity and exotic compact objects, such as gravastars and empty shells [26]. Furthermore, precise measurements of gravitational-wave signals in the earliest stages of the inspiral phase of the orbital evolution, and the subsequent extraction and comparison of the tidal Love numbers with the theoretical predictions can reveal important information about the internal structure of compact objects.…”

Section: Discussionmentioning

confidence: 99%

Testing strong gravity with gravitational waves and Love numbers

Franzin

Cardoso

Pani

et al. 2017

J. Phys.: Conf. Ser.

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Abstract. The LIGO observation of GW150914 has inaugurated the gravitational-wave astronomy era and the possibility of testing gravity in extreme regimes. While distorted black holes are the most convincing sources of gravitational waves, similar signals might be produced also by other compact objects. In particular, we discuss what the gravitational-wave ringdown could tell us about the nature of the emitting object, and how measurements of the tidal Love numbers could help us in understanding the internal structure of compact dark objects.

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Section: Discussionmentioning

confidence: 99%

Testing strong gravity with gravitational waves and Love numbers

Franzin

Cardoso

Pani

et al. 2017

J. Phys.: Conf. Ser.

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“…Firewalls, with an expected R α ∼ L given by a microscopic scale (e.g the Planck length) are probably hard to test with such observations, unless there are reflection effects (see e.g. [8][9][10][11][12]) from the firewall. For fuzzballs, one expects L to be microscopic, but there is no clear prediction for R α .…”

Section: Oct 2017mentioning

confidence: 99%

“…[8][9][10][11][12]) from the firewall. For fuzzballs, one expects L to be microscopic, but there is no clear prediction for R α .…”

mentioning

confidence: 99%

Astronomical tests for quantum black hole structure

Giddings

2017

Nat Astron

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Quantum modifications to black holes on scales comparable to the horizon size, or even more radical physics, are apparently needed to reconcile the existence of black holes with the principles of quantum mechanics. This piece gives an overview of some possible observational tests for such departures from a classical description of black holes, via gravitational wave detection and very long baseline interferometry. (Invited comment for Nature Astronomy.) * giddings@ucsb.edu 1 arXiv:1703.03387v2 [gr-qc] Oct 2017Black holes present a profound challenge to our current foundations of physics, and an exciting era of astronomy is just opening where gravitational wave observation, represented by the recent LIGO detections [1], and very long baseline interferometry (VLBI), which is on the verge of resolving the immediate environs of super-massive black holes [2], may provide important hints about the new principles of physics needed.While the near-horizon region of a black hole is intrinsically interesting and has not been directly probed before, the conventional expectation has been that physics here, for astrophysical black holes, will be governed by classical general relativity (GR), and so the new observations should simply confirm GR's validity. After all, the spacetime curvature near such a horizona basic measure of the local gravity -would be tiny as compared to the values expected to be associated with any quantum behavior of spacetime.However, Hawking's discovery that black holes evaporate [3] has shaken this view to the core, with many quantum physicists now concluding that this result implies significant modifications to spacetime near black holes, and perhaps even further away. In fact, an attempt to give a logically consistent description of the evolution of black holes has lead to a foundational crisis in physics, which is apparently difficult to resolve without modifications to conventional physics not just at very short distance scales, as is expected in quantum gravity, but on macroscopic scales comparable to horizon radii of large black holes.The problem arises when considering information that falls into a black hole. In our most basic framework for currently established physics, quantum field theory, information cannot propagate faster than light, so then cannot escape. Therefore if a black hole evaporates away and disappears, as Hawking predicted, it destroys the information that fell in. This violates a bedrock principle of quantum mechanics, unitarity. Physicists have struggled with this issue for forty years [3], without finding a logically consistent resolution respecting current principles of physics. This problem appears to represent a profound conflict between the principles of relativity, the principles of quantum mechanics, and the principle of locality, which are the foundational principles of quantum field theory -our most fundamental current description of reality.Apparently something must give. Attempts to modify quantum mechanics have led to nonsensical conclusions, so many no...

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“…Further work established that this picture was robust [47] across many different ECO models with many different test particle sources, but breaks down for less compact ECOs, which sometimes have ringdowns consistent with the resonant frequencies of the ECO [48,49]. Price and Khanna conjectured that the echoes can be considered as a superposition of the resonant modes of the ECO [49].…”

Section: Introductionmentioning

confidence: 99%

A recipe for echoes from exotic compact objects

et al. 2017

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Gravitational wave astronomy provides an unprecedented opportunity to test the nature of black holes and search for exotic, compact alternatives. Recent studies have shown that exotic compact objects (ECOs) can ring down in a manner similar to black holes, but can also produce a sequence of distinct pulses resembling the initial ringdown. These "echoes" would provide definite evidence for the existence of ECOs. In this work we study the generation of these echoes in a generic, parametrized model for the ECO, using Green's functions. We show how to reprocess radiation in the near-horizon region of a Schwarzschild black hole into the asymptotic radiation from the corresponding source in an ECO spacetime. Our methods allow us to understand the connection between distinct echoes and ringing at the resonant frequencies of the compact object. We find that the quasinormal mode ringing in the black hole spacetime plays a central role in determining the shape of the first few echoes. We use this observation to develop a simple template for echo waveforms. This template preforms well over a variety of ECO parameters, and with improvements may prove useful in the analysis of gravitational waves.

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

Cited by 514 publications

References 73 publications

Testing strong gravity with gravitational waves and Love numbers

Testing strong gravity with gravitational waves and Love numbers

Astronomical tests for quantum black hole structure

A recipe for echoes from exotic compact objects

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