Entropy, Black holes, and the New Cyclic Universe

Ijjas, Anna; Steinhardt, Paul J.

doi:10.1016/j.physletb.2021.136823

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Entropy, Black holes, and the New Cyclic Universe

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Ijjas, Anna
Lise Meitner Excellence Group: Gravitational Theory and Cosmology, AEI-Hannover, MPI for Gravitational Physics, Max Planck Society;

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Citation

Ijjas, A., & Steinhardt, P. J. (2022). Entropy, Black holes, and the New Cyclic Universe. Physics Letters B, 824: 136823. doi:10.1016/j.physletb.2021.136823.

Cite as: https://hdl.handle.net/21.11116/0000-0009-05B9-1

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.