Are quantum corrections on horizon scale physically motivated?

Compère, Geoffrey

doi:10.1142/s0218271819300192

Cited by 10 publications

(12 citation statements)

References 71 publications

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“…In this case, Eq. (25) takes the form a = 2πc T dS , i.e we find the same equation as in (26) valid for black holes, with T dS replacing the black holes temperature T . For the dS universe, Eq.…”

Section: The De Sitter Universesupporting

confidence: 56%

“…For example, in the corpuscular gravity scenario black holes and the de Sitter universe may be explained as quantum coherent states of a large number of gravitons [11,12,13,14,15,16,17,18,19,20,21,22,23]. Recent investigations on the topic have also suggested that quantum gravity corrections may also be relevant at the horizon of astrophysical black holes [26,27,25].…”

Section: Introductionmentioning

confidence: 99%

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Galactic dynamics and long-range quantum gravity

Cadoni

Tuveri

2019

Phys. Rev. D

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We explore in a systematic way the possibility that long-range quantum gravity effects could play a role at galactic scales and could be responsible for the phenomenology commonly attributed to dark matter. We argue that the presence of baryonic matter breaks the scale symmetry of the de Sitter (dS) spacetime generating an IR scale r0, corresponding to the scale at which the typical dark matter effects we observe in galaxies arise. It also generates a huge number of bosonic excitations with wavelength larger than the size of the cosmological horizon and in thermal equilibrium with dS spacetime. We show that for r r0 these excitations produce a new component for the radial acceleration of stars in galaxies which leads to the result found by McGaugh et al. by fitting a large amount of observational data and with the MOND theory. We also propose a generalized thermal equivalence principle and use it to give another independent derivation of our result. Finally, we show that our result can be also derived as the weak field limit of Einstein's general relativity sourced by an anisotropic fluid. *

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Section: The De Sitter Universesupporting

confidence: 56%

Section: Introductionmentioning

confidence: 99%

Galactic dynamics and long-range quantum gravity

Cadoni

Tuveri

2019

Phys. Rev. D

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“…Yet, the possibility of quantum-gravity effects at the horizon has been raised, e.g. in [6,44,75,76,84]. In particular, for extended objects like black-hole horizons, a simple power-counting argument based on the local curvature might be misleading.…”

Section: Motivationmentioning

confidence: 99%

Asymptotic safety casts its shadow

Held

Gold

Eichhorn

2019

J. Cosmol. Astropart. Phys.

123

138

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We set out to bridge the gap between regular black-hole spacetimes and observations of a black-hole shadow by the Event Horizon Telescope. We explore modifications of spinning and non-spinning black-hole spacetimes inspired by asymptotically safe quantum gravity which features a scale dependence of the Newton coupling. As a consequence, the predictions of our model, such as the shadow shape and size, depend on one free parameter determining the curvature scale at which deviations from General Relativity set in. In more general new-physics settings, it can also depart substantially from the Planck scale. In this case, the free parameter is constrained by observations, since the corresponding curvature scale is significantly below the Planck-scale. The leading new-physics effect can be recast as a scale-dependent black-hole mass, resulting in distinct observational signatures of our model. As a concrete example, we show that two mass-measurements, extracted from the size of the shadow and from Keplerian orbital motion of stars, allow to distinguish the classical from the modified, regular black-hole spacetime, yielding a bound on the free parameter. For spinning black holes, we further find that the singularity-resolving new physics puts a characteristic dent in the shadow. Finally, we argue, based on the underlying physical mechanism, that the effects we derive could be generic consequences of a large class of quantum-gravity theories.

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“…A sharp way to state a paradox is as a set of hypotheses that are all assumed to be true, but which are in logical contradiction. The paradox is resolved if one can prove one of the hypothesis wrong [82,83,84,85,86]. For the information paradox these hypothesis are basically unitary quantum mechanics, and the assumptions that go into the Hawking calculation [80].…”

Section: Information Paradoxmentioning

confidence: 99%

Clocks and rods in Jackiw-Teitelboim quantum gravity

Blommaert

Mertens

Verschelde

2019

J. High Energ. Phys.

131

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We specify bulk coordinates in Jackiw-Teitelboim (JT) gravity using a boundaryintrinsic radar definition. This allows us to study and calculate exactly diff-invariant bulk correlation functions of matter-coupled JT gravity, which are found to satisfy microcausality. We observe that quantum gravity effects dominate near-horizon matter correlation functions. This shows that quantum matter in classical curved spacetime is not a sensible model for near-horizon matter-coupled JT gravity. This is how JT gravity, given our choice of bulk frame, evades an information paradox. This echoes into the quantum expectation value of the near-horizon metric, whose analysis is extended from the disk model to the recently proposed topological completion of JT gravity [1]. Due to quantum effects, at distances of order the Planck length to the horizon, a dramatic breakdown of Rindler geometry is observed.

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Are quantum corrections on horizon scale physically motivated?

Cited by 10 publications

References 71 publications

Galactic dynamics and long-range quantum gravity

Galactic dynamics and long-range quantum gravity

Asymptotic safety casts its shadow

Clocks and rods in Jackiw-Teitelboim quantum gravity

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