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Brief history of curvature

Author(s): Caldwell, Robert R; Gubser, Steven S

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Abstract: The trace of the stress-energy tensor of the cosmological fluid, proportional to the Ricci scalar curvature in general relativity, is determined on cosmic scales for times ranging from the inflationary epoch to the present day in the expanding Universe. The post-inflationary epoch and the thermal history of the relativistic fluid, in particular the QCD transition from asymptotic freedom to confinement and the electroweak phase transition, leave significant imprints on the scalar curvature. These imprints can be of either sign and are orders of magnitude larger than the values that would be obtained by naively extrapolating the pressureless matter of the present epoch back into the radiation-dominated epoch.
Publication Date: Mar-2013
Electronic Publication Date: 22-Mar-2013
Citation: Caldwell, Robert R, Gubser, Steven S. (2013). Brief history of curvature. Physical Review D, 87 (6), 10.1103/PhysRevD.87.063523
DOI: doi:10.1103/PhysRevD.87.063523
ISSN: 1550-7998
EISSN: 1550-2368
Pages: 063523-1 to 063523-11
Type of Material: Journal Article
Journal/Proceeding Title: Physical Review D
Version: Final published version. Article is made available in OAR by the publisher's permission or policy.

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