Entropy, black holes, and the new cyclic universe

Anna Ijjas; Paul J. Steinhardt

doi:10.1016/j.physletb.2021.136823

Entropy, black holes, and the new cyclic universe

Anna Ijjas, Paul J. Steinhardt

Research output: Contribution to journal › Article › peer-review

13 Scopus citations

Abstract

We track the evolution of entropy and black holes in a cyclic universe that undergoes repeated intervals of expansion followed by slow contraction and a smooth (non-singular) bounce. In this kind of cyclic scenario, there is no big crunch and no chaotic mixmaster behavior. We explain why the entropy following each bounce is naturally partitioned into near-maximal entropy in the matter-radiation sector and near-minimal in the gravitational sector, satisfying the Weyl curvature conditions conjectured to be essential for a cosmology consistent with observations. As a result, this kind of cyclic universe can undergo an unbounded number of cycles in the past and/or the future.

Original language	English (US)
Article number	136823
Journal	Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Volume	824
DOIs	https://doi.org/10.1016/j.physletb.2021.136823
State	Published - Jan 10 2022

All Science Journal Classification (ASJC) codes

Nuclear and High Energy Physics

Keywords

Black hole
Bouncing cosmology
Cosmological bounce
Cyclic universe
Slow contraction

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10.1016/j.physletb.2021.136823

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title = "Entropy, black holes, and the new cyclic universe",

abstract = "We track the evolution of entropy and black holes in a cyclic universe that undergoes repeated intervals of expansion followed by slow contraction and a smooth (non-singular) bounce. In this kind of cyclic scenario, there is no big crunch and no chaotic mixmaster behavior. We explain why the entropy following each bounce is naturally partitioned into near-maximal entropy in the matter-radiation sector and near-minimal in the gravitational sector, satisfying the Weyl curvature conditions conjectured to be essential for a cosmology consistent with observations. As a result, this kind of cyclic universe can undergo an unbounded number of cycles in the past and/or the future.",

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AU - Ijjas, Anna

AU - Steinhardt, Paul J.

PY - 2022/1/10

Y1 - 2022/1/10

N2 - We track the evolution of entropy and black holes in a cyclic universe that undergoes repeated intervals of expansion followed by slow contraction and a smooth (non-singular) bounce. In this kind of cyclic scenario, there is no big crunch and no chaotic mixmaster behavior. We explain why the entropy following each bounce is naturally partitioned into near-maximal entropy in the matter-radiation sector and near-minimal in the gravitational sector, satisfying the Weyl curvature conditions conjectured to be essential for a cosmology consistent with observations. As a result, this kind of cyclic universe can undergo an unbounded number of cycles in the past and/or the future.

AB - We track the evolution of entropy and black holes in a cyclic universe that undergoes repeated intervals of expansion followed by slow contraction and a smooth (non-singular) bounce. In this kind of cyclic scenario, there is no big crunch and no chaotic mixmaster behavior. We explain why the entropy following each bounce is naturally partitioned into near-maximal entropy in the matter-radiation sector and near-minimal in the gravitational sector, satisfying the Weyl curvature conditions conjectured to be essential for a cosmology consistent with observations. As a result, this kind of cyclic universe can undergo an unbounded number of cycles in the past and/or the future.

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KW - Bouncing cosmology

KW - Cosmological bounce

KW - Cyclic universe

KW - Slow contraction

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ER -

Entropy, black holes, and the new cyclic universe

Abstract

All Science Journal Classification (ASJC) codes

Keywords

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