Cosmological bounce and the cosmological constant problem

Pavlović, Petar; Sossich, Marko

doi:10.1016/j.dark.2022.101161

Physics of the Dark Universe

2023

DOI: 10.1016/j.dark.2022.101161

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Cosmological bounce and the cosmological constant problem

Petar Pavlović

Marko Sossich

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Cited by 2 publications

References 35 publications

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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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Creation of wormholes during the cosmological bounce

Pavlović

Sossich

2023

Eur. Phys. J. C

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Geodesically complete cyclic cosmologies and entropy

Pavlović,

Sossich

2024

Eur. Phys. J. C

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We demonstrate that there exists a class of cyclic cosmological models, such that these models can in principle solve the problem of the entropy growth, and are at the same time geodesically complete. We thus show that some recently stated conclusions, according to which cyclic cosmologies solving the problem of entropy growth can not be geodesically complete due to the Borde–Guth–Vilenkin (BGV) theorem, are not justified. We also add a short conceptual discussion on entropy and cyclic cosmology, and present a detailed analysis of entropy density growth during periodic and non-periodic evolution for cyclic cosmologies.

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Cosmological bounce and the cosmological constant problem

Cited by 2 publications

References 35 publications

Creation of wormholes during the cosmological bounce

Creation of wormholes during the cosmological bounce

Geodesically complete cyclic cosmologies and entropy

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