Islands in Closed and Open Universes

Bousso, Raphael; Wildenhain, Elizabeth

doi:10.48550/arxiv.2202.05278

Cited by 3 publications

(3 citation statements)

References 30 publications

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“…Although the island formula is derived from Jackiw-Teitelboim (JT) black holes, its application is beyond the context of Anti-de Sitter (AdS) spacetime. It can be applied to other spacetime backgrounds, such as the other AdS 2 black hole [10][11][12][13][14][15][16][17], the two-dimensional (2D) dilaton gravity [18][19][20][21][22][23][24], the higher-dimensional spacetime [25][26][27][28][29][30][31][32][33][34], the cosmology [35][36][37][38][39][40][41][42], the boundary conformal field theory (BCFT) [43][44][45][46][47][48][49]. Interestingly, there are also some related works for the Sachdev-Ye-Kitaev (SYK) model [50][51][52][53][54][55].…”

Section: Introductionmentioning

confidence: 99%

Page curve and phase transition in deformed Jackiw–Teitelboim gravity

et al. 2023

Eur. Phys. J. C

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We consider the entanglement island in a deformed Jackiw–Teitelboim black hole in the presence of the phase transition. This black hole has the van der Waals–Maxwell-like phase structure as it is coupled with a Maxwell field. We study the behavior of the Page curve of this black hole by using the island paradigm. In the fixed charge ensemble, we discuss different situations with different charges that influence the system’s phase structure. There is only a Hawking–Page phase transition in the absence of charges, which leads to an unstable small black hole. Hence, the related Page curve does not exist. However, a van der Waals–Maxwell-like phase transition occurs in the presence of charges. This yields three black hole solutions. The Page curve of the middle size black hole does not exist. For the extremal black hole, the Page time approaches zero in the phase transition situation but becomes divergent without the phase transition. In a word, we study the Page curve and the island paradigm for different black hole phases and in different phase transition situations.

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Section: Introductionmentioning

confidence: 99%

Page curve and phase transition in deformed Jackiw–Teitelboim gravity

et al. 2023

Eur. Phys. J. C

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“…Recently there have been several investigations regarding the island proposal in cosmological setups (see for example [18,19,20,21,22,23,24]). Amongst them some have focused on the experience of the static observer in pure de Sitter background.…”

Section: Introductionmentioning

confidence: 99%

Islands in Kerr-de Sitter spacetime and their flat limit

Azarnia,

Fareghbal

2022

Preprint

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We use quantum extremal island method to study the information paradox on certain cosmological setups known as three dimensional Kerr-de Sitter spacetimes. To do so, we couple an auxiliary flat bath system to this spacetime in timelike singularity and measure entropy of hawking radiation in its asymptotic regions where the gravity is weak. We show that adding island regions to the entanglement wedge of radiation causes its entropy to obey Page curve. The boundary of island i.e. quantum extremal surface is located outside the cosmological horizon in the region connected directly to the bath. Taking the flat-space limit from the location of island and its related calculation in the Kerr-de Sitter sapcetime results in the flat-space cosmology (FSC) island, scrambling time and also Page time that were obtained in our previous paper. We repeat the same calculation for the pure de Sitter spacetime and show that our setup which neglects the effect of backreaction, leads also to a quantum extremal surface outside the cosmological horizon. We calculate the scrambling time and confirm the idea that pure de Sitter spacetime is a fast scrambler.

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“…This remarkable progress in black hole physics motivates the application of the 'island rule' to other quantum gravity systems. Among possible backgrounds composing the quantum gravity system, de Sitter (dS) space has drawn considerable interest [11][12][13][14][15][16][17][18][19][20][21] since an observer in dS space can access the finite portion of spacetime surrounded by the event horizon only. The observer cannot receive signals from the region beyond the horizon due to the accelerating expansion, which leads to the production of thermal radiation near the horizon [22].…”

Section: Introductionmentioning

confidence: 99%

Information paradox and island in quasi-de Sitter space

Seo

2022

Eur. Phys. J. C

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Whereas a static observer in de Sitter (dS) space detects thermal radiation emitted by the horizon, the dS isometries impose that the radiation is in equilibrium with the background. This implies that for the static observer to find the information paradox, the background must be deformed to quasi-dS space in which the dS isometries are spontaneously broken. We study the condition that the information paradox arises in quasi-dS space with the monotonically increasing horizon size which is used to describe the inflationary cosmology. For this purpose, the dimensional reduction of three-dimensional dS space with thermal radiation modelled by the JT gravity coupled to CFT is considered. We argue that when the central charge monotonically increases in time, the information paradox arises but the conditions for the existence of the island become more restrictive. As the central charge can be interpreted as the number of degrees of freedom, the absence of the island in quasi-dS space supports the entropy argument for the dS swampland conjecture.

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Islands in Closed and Open Universes

Cited by 3 publications

References 30 publications

Page curve and phase transition in deformed Jackiw–Teitelboim gravity

Page curve and phase transition in deformed Jackiw–Teitelboim gravity

Islands in Kerr-de Sitter spacetime and their flat limit

Information paradox and island in quasi-de Sitter space

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