Details
| Original language | English |
|---|---|
| Article number | 136823 |
| Journal | Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics |
| Volume | 824 |
| Early online date | 8 Dec 2021 |
| Publication status | Published - 10 Jan 2022 |
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.
Keywords
- Black hole, Bouncing cosmology, Cosmological bounce, Cyclic universe, Slow contraction
ASJC Scopus subject areas
- Physics and Astronomy(all)
- Nuclear and High Energy Physics
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In: Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, Vol. 824, 136823, 10.01.2022.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Entropy, black holes, and the new cyclic universe
AU - Ijjas, Anna
AU - Steinhardt, Paul J.
N1 - Funding Information: We thank R. Penrose, V. Mukhanov, L. Page and M. Chitoto for useful discussions. The work of A.I. is supported by the Simons Foundation grant number 663083 . P.J.S. is supported in part by the DOE grant number DEFG02-91ER40671 and by the Simons Foundation grant number 654561 .
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.
KW - Black hole
KW - Bouncing cosmology
KW - Cosmological bounce
KW - Cyclic universe
KW - Slow contraction
UR - http://www.scopus.com/inward/record.url?scp=85120990885&partnerID=8YFLogxK
U2 - 10.1016/j.physletb.2021.136823
DO - 10.1016/j.physletb.2021.136823
M3 - Article
AN - SCOPUS:85120990885
VL - 824
JO - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
JF - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
SN - 0370-2693
M1 - 136823
ER -