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Cosmic no-hair theorems for viscous contracting Universes
- Publication Year :
- 2021
- Publisher :
- Apollo - University of Cambridge Repository, 2021.
-
Abstract
- A cosmic no-hair theorem for all initially contracting, spatially homogeneous, orthogonal Bianchi Cosmologies is derived - which shows that all such Universes asymptote to a spatially flat, isotropic Universe with the inclusion of a shear viscous stress. This establishes a new mechanism of isotropisation in a contracting Universe, which does not take recourse to an ekpyrosis-like mechanism using an effective ultra-stiff equation of state fluid, that is, one in which the pressure is much greater than the energy density.<br />9 pages
- Subjects :
- Physics
High Energy Physics - Theory
COSMIC cancer database
Cosmology and Nongalactic Astrophysics (astro-ph.CO)
Equation of state (cosmology)
cosmic singularity
media_common.quotation_subject
paper
Isotropy
FOS: Physical sciences
Astronomy and Astrophysics
General Relativity and Quantum Cosmology (gr-qc)
alternatives to inflation
Universe
General Relativity and Quantum Cosmology
Shear (sheet metal)
Classical mechanics
High Energy Physics - Theory (hep-th)
Homogeneous
physics of the early universe
Asymptote
Viscous stress tensor
media_common
Astrophysics - Cosmology and Nongalactic Astrophysics
Subjects
Details
- Database :
- OpenAIRE
- Accession number :
- edsair.doi.dedup.....31b9dafbb6518934d65fdf25a43792ca
- Full Text :
- https://doi.org/10.17863/cam.72902