Bouncing cosmology made simple

We introduce the 'wedge diagram', an intuitive way to illustrate how cosmological models with a classical (non-singular) bounce generically resolve fundamental problems in cosmology. These include the well-known horizon, flatness, and inhomogeneity problems; the small tensor-to-scalar rati...

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Bibliographic Details
Published in:Classical and quantum gravity 2018-06, Vol.35 (13), p.135004
Main Authors: Ijjas, Anna, Steinhardt, Paul J
Format: Article
Language:English
Subjects:
Astronomy & Astrophysics
bouncing cosmology
ekyprotic universe
flatness problem
homogeneity problem
Physics
singularity problem
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Summary:We introduce the 'wedge diagram', an intuitive way to illustrate how cosmological models with a classical (non-singular) bounce generically resolve fundamental problems in cosmology. These include the well-known horizon, flatness, and inhomogeneity problems; the small tensor-to-scalar ratio observed in the cosmic microwave background; the low entropy at the beginning of a hot, expanding phase; and the avoidance of quantum runaway. The same diagrammatic approach can be used to compare with other cosmological scenarios.
ISSN:0264-9381
1361-6382
DOI:10.1088/1361-6382/aac482