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Anisotropic cosmology and inflation from a tilted Bianchi IX model
KTH, Centres, Nordic Institute for Theoretical Physics NORDITA. Turku Center for Quantum Physics, Department of Physics and Astronomy, University of Turku, Turku, Finland.
KTH, Centres, Nordic Institute for Theoretical Physics NORDITA.ORCID iD: 0000-0002-9403-8565
2015 (English)In: Physical Review D, ISSN 1550-7998, E-ISSN 1550-2368, Vol. 92, no 12, 123529Article in journal (Refereed) PublishedText
Abstract [en]

The dynamics of the tilted axisymmetric Bianchi IX cosmological models are explored allowing energy flux in the source fluid. The Einstein equations and the continuity equation are presented treating the equation of state w and the tilt angle of the fluid lambda as time-dependent functions, but when analyzing the phase space w and lambda are considered free parameters and the shear, the vorticity and the curvature of the spacetime span a three-dimensional phase space that contains seven fixed points. One of them is an attractor that inflates the universe anisotropically, thus providing a counterexample to the cosmic no-hair conjecture. Also, examples of realistic though fine-tuned cosmologies are presented wherein the rotation can become significant towards the present epoch but the shear stays within the observational bounds. The examples suggest that the model used here can explain the parity-violating anomalies of the cosmic microwave background. The result significantly differs from an earlier study, where a nonaxisymmetric Bianchi IX type model with a tilted perfect dust source was found to induce too much shear for observationally significant vorticity.

Place, publisher, year, edition, pages
American Physical Society , 2015. Vol. 92, no 12, 123529
Keyword [en]
National Category
Physical Sciences
URN: urn:nbn:se:kth:diva-180595DOI: 10.1103/PhysRevD.92.123529ISI: 000367078600006ScopusID: 2-s2.0-84953272708OAI: diva2:898614

QC 20160128

Available from: 2016-01-28 Created: 2016-01-19 Last updated: 2016-02-05Bibliographically approved

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Sundell, PeterKoivisto, Tomi Sebastian
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