Information loss

Unruh, W. G.; Wald, Robert M.

doi:10.1088/1361-6633/aa778e

Cited by 242 publications

(188 citation statements)

References 27 publications

(50 reference statements)

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“…While black holes are consistent with all electromagnetic and gravitational wave observations to date [4,5,[8][9][10], no experiment has been able probe spacetime near the event horizon [11][12][13]. Moreover, the event horizon is at the heart of the BH information paradox [14], and the role of black holes in a quantum theory of gravity is an open question.…”

Section: Introductionmentioning

confidence: 92%

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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Section: Introductionmentioning

confidence: 92%

A recipe for echoes from exotic compact objects

et al. 2017

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“…The impact of the multipolar structure on the GW phase will allow one to estimate and constrain possible deviations from the Kerr geometry [185]. Thomson's atomic model was carefully constructed, and tested theoretically for inconsistencies 9 . Rutherford's incursion into scattering of α particles were not meant to disprove the model, they were aimed at testing its accuracy.…”

Section: Precision Physicsmentioning

confidence: 99%

“…The resolution of such problems could include changing the endstate of collapse [4][5][6][7][8] (perhaps as-yet-unknown physics can prevent the formation of horizons), or altering drastically the near-horizon region [9]. The fact of the matter is that there is no tested nor fully satisfactory theory of quantum gravity, in much the same way that one did not have a quantum theory of point particles at the beginning of the 20th century.…”

Section: Introductionmentioning

confidence: 99%

Tests for the existence of black holes through gravitational wave echoes

2017

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The existence of black holes and of spacetime singularities is a fundamental issue in science. Despite this, observations supporting their existence are scarce, and their interpretation unclear. We overview how strong a case for black holes has been made in the last few decades, and how well observations adjust to this paradigm. Unsurprisingly, we conclude that observational proof for black holes is impossible to come by. However, just like Popper's black swan, alternatives can be ruled out or confirmed to exist with a single observation. These observations are within reach. In the next few years and decades, we will enter the era of precision gravitational-wave physics with more sensitive detectors. Just as accelerators require larger and larger energies to probe smaller and smaller scales, more sensitive gravitational-wave detectors will be probing regions closer and closer to the horizon, potentially reaching Planck scales and beyond. What may be there, lurking? 1 arXiv:1707.03021v4 [gr-qc]

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“…It is only in the last stages of the evaporation that the existence of singularities cannot be ignored. However, these very last stages do play a crucial role in determining the answer to important questions about the compatibility of general relativity and quantum mechanics -as in the information loss problem [3][4][5][6][7] or simply in determining the final fate of black holes.…”

Section: Introductionmentioning

confidence: 99%

On the viability of regular black holes

Carballo-Rubio

Filippo

Liberati

et al. 2018

J. High Energ. Phys.

176

146

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The evaporation of black holes raises a number of conceptual issues, most of them related to the final stages of evaporation, where the interplay between the central singularity and Hawking radiation cannot be ignored. Regular models of black holes replace the central singularity with a nonsingular spacetime region, in which an effective classical geometric description is available. It has been argued that these models provide an effective, but complete, description of the evaporation of black holes at all times up to their eventual disappearance. However, here we point out that known models fail to be self-consistent: the regular core is exponentially unstable against perturbations with a finite timescale, while the evaporation time is infinite, therefore making the instability impossible to prevent. We also discuss how to overcome these difficulties, highlighting that this can be done only at the price of accepting that these models cannot be fully predictive regarding the final stages of evaporation.

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Information loss

Cited by 242 publications

References 27 publications

A recipe for echoes from exotic compact objects

A recipe for echoes from exotic compact objects

Tests for the existence of black holes through gravitational wave echoes

On the viability of regular black holes

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