Holographic bounce

Nojiri, Shin'ichi; Odintsov, Sergei D.; Saridakis, Emmanuel N.

doi:10.48550/arxiv.1908.00389

Cited by 5 publications

(4 citation statements)

References 77 publications

(99 reference statements)

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“…Various investigations in the past decades have demonstrated that even simple modifications of gravitational Lagrangian with respect to the standard Einstein-Hilbert action, while leaving all other physical assumptions of Einstein's general relativity intact, can prevent the appearance of the big-bang singularity [8][9][10][11][12][13][14][15][16][17][18][19][20][21]. Also, in higher curvature gravity theories some important non-singular investigations have been done in Gauss-Bonnet higher curvature gravity [22][23][24] and in f (R) gravity theories [25][26][27].…”

Section: Introductionmentioning

confidence: 99%

Creation of wormholes during the cosmological bounce

Pavlović

Sossich

2023

Eur. Phys. J. C

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In this work we demonstrate that wormholes can in principle be naturally created during the cosmological bounce without the need for the exotic matter or any kind of additional modifications of the gravitational sector, apart from the one enabling the cosmological bounce. This result is general and does not depend on the details of the modifications of gravitational equations needed to support the bounce. To study the possible existence of wormholes around the cosmological bounce we introduce general modifications of Einstein’s field equations need to support the bouncing solutions. In this regime we show that it is possible to construct a cosmological wormhole solution supported by matter, radiation and vacuum energy, satisfying the Weak Energy Condition (WEC), which asymptotically approaches the Friedmann–Lemaître–Robertson–Walker (FLRW) metric. However, at a specific cosmological time, which depends on the parameters of the bouncing cosmological model, the WEC describing the matter needed to support such wormholes is spontaneously violated. This means that such wormholes could potentially exist in large numbers during some period around the bounce, significantly changing the causal structure of space-time, and then vanish afterwards.

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Section: Introductionmentioning

confidence: 99%

Creation of wormholes during the cosmological bounce

Pavlović

Sossich

2023

Eur. Phys. J. C

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“…However, it inevitably suffers from the initial singularity problem [5]. Due to this concern, bouncing cosmology, which addresses this issue with a non-zero minimal size of universe, has been extensively studied such as in [6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21][22]. As a promising alternative to inflation, it can also resolve the horizon and flatness problems and generate a nearly scale-invariant curvature spectrum [23][24][25].…”

Section: Introductionmentioning

confidence: 99%

Warm and Cold Dark Matter in Bouncing Universe

2020

Preprint

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Being free from the initial singularity, bouncing cosmology serves as a promising alternative to inflation. However, the entropy production during the post-bounce phase is still unclear. In this work, we use a newly unveiled DM candidate (EQFIDM), which can directly freeze in thermal equilibrium shortly after bounce, to trace the entropy-producing decay process of residual bouncing field (RBF). Specifically, we present a modelindependent formalism to obtain all nine possible types of the entropy-producing decay of RBF within a generic bouncing universe, and show that, due to the entropy productions in different types, the particle mass of this new candidate can range from sub-keV scale to super-TeV scale. With current Lyman-α forest observation on linear matter spectrum, we find that, although four types have been excluded, the rest five types, which suggest warm and cold EQFIDM candidates with effective entropy productions, are accommodated with current observation. Then we illustrate how the nature of RBF can be constrained by current observation and investigate the potential of EQFIDM on alleviating small-scale crisis.

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“…Further investigations with application to holographic dark energy in the late-time cosmology were presented in several papers [4][5][6][7][8][9][10][11][12][13]. The holographic principle can be realized also in the early universe, obtaining inflation [14], and a cosmological bounce [15], having a holographic origin. It has been shown that the application of the theory of holographic dark energy in the late-time universe is consistent with astronomical observations [16][17][18][19][20].…”

Section: Introductionmentioning

confidence: 99%

Rip brane cosmology from a viscous holographic dark fluid

Brevik,

Timoshkin

2020

Preprint

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This article is devoted to the application of the holographic principle to describe Rip brane cosmological models in the presence of a bulk viscosity. We make use of the generalized infraredcutoff holographic dark energy, introduced by Nojiri and Odintsov. We consider various examples: Rip brane cosmology corresponding to the Little Rip case, asymptotic de Sitter theory, and the so-called Big Freeze theory leading to a singularity. Analytical expressions for infrared cutoffs, as well as the particle and the future horizons at the brane, are obtained. The equations for energy conservation on the brane within the holographic theory are obtained in each case. The correspondence between viscous cosmology and holographic cosmology on the brane is shown.

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Holographic bounce

Cited by 5 publications

References 77 publications

Creation of wormholes during the cosmological bounce

Creation of wormholes during the cosmological bounce

Warm and Cold Dark Matter in Bouncing Universe

Rip brane cosmology from a viscous holographic dark fluid

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