Corpuscular slow-roll inflation

Casadio, Roberto; Giugno, Andrea; Giusti, Andrea

doi:10.1103/physrevd.97.024041

Cited by 20 publications

(26 citation statements)

References 35 publications

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“…The length L therefore satisfies a relation exactly like the Schwarzschild radius for a black hole of ADM mass E L , which supports the conjecture that the de Sitter spacetime could likewise be described as a condensate [13]. One can roughly describe the corpuscular model by assuming that the graviton self-interaction gives rise to a condensate of N (soft virtual) gravitons of typical Compton length of the order of L, so that E L N p m p /L and the usual consistency conditions…”

Section: Quantum Primordial Black Holessupporting

confidence: 71%

“…The corpuscular picture of gravity [11] was first introduced for describing black holes, but it also applies to * A.Giugno@physik.uni-muenchen.de cosmology and inflation in particular [12,13]. In order to have the de Sitter space-time in general relativity, one must assume the existence of a cosmological constant Λ, or vacuum energy density ρ L , so that the Friedman equation reads 1…”

Section: Quantum Primordial Black Holesmentioning

confidence: 99%

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Quantum formation of primordial black holes

et al. 2019

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We provide a (simplified) quantum description of primordial black holes at the time of their formation. Specifically, we employ the horizon quantum mechanics to compute the probability of black hole formation starting from a simple quantum mechanical characterization of primordial density fluctuations given by a Planckian spectrum. We then estimate the initial number of primordial black holes in the early universe as a function of their typical mass, spatial width and temperature of the fluctuation.

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Section: Quantum Primordial Black Holessupporting

confidence: 71%

Section: Quantum Primordial Black Holesmentioning

confidence: 99%

Quantum formation of primordial black holes

et al. 2019

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“…The corpuscular description of gravity was first put forward in order to address some of the fundamental issues which arise when considering quantum effects in black hole space-times [1], and was subsequently applied to gravitation in the whole Universe [2][3][4][5][6]. Dvali and Gomez [1] have proposed a new perspective in which black holes are viewed as Bose-Einstein condensates (BEC) made of a very large number of soft (self-bound) gravitons.…”

Section: Introductionmentioning

confidence: 99%

Lower-dimensional corpuscular gravity and the end of black hole evaporation

2019

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Black holes in d < 3 spatial dimensions are studied from the perspective of the corpuscular model of gravitation, in which black holes are described as Bose-Einstein condensates of (virtual soft) gravitons. In particular, since the energy of these gravitons should increase as the black hole evaporates, eventually approaching the Planck scale, the lower dimensional cases could provide important insight into the late stages and end of Hawking evaporation. We show that the occupation number of gravitons in the condensate scales holographically in all dimensions as N d ∼ (L d /ℓp) d−1 , where L d is the relevant length for the system in the (1 + d)-dimensional space-time. In particular, this analysis shows that black holes cannot contain more than a few gravitons in d = 1. Since dimensional reduction is a common feature of many models of quantum gravity, this result can shed light on the end of the Hawking evaporation. We also consider (1 + 1)-dimensional cosmology in the context of corpuscular gravity, and show that the Friedmann equation reproduces the expected holographic scaling as in higher dimensions.

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“…In particular, it was shown in Refs. [25,26] that Starobinsky's inflation is naturally embedded in this framework.…”

Section: Introductionmentioning

confidence: 99%