Accelerating cosmological expansion from shear and bulk viscosity

• Verfasst von: Flörchinger, Stefan [VerfasserIn]
• Verfasst von: Tetradis, Nikolaos [VerfasserIn]
• Verfasst von: Wiedemann, Urs Achim [VerfasserIn]
• Titel: Accelerating cosmological expansion from shear and bulk viscosity
• Verf.angabe: Stefan Floerchinger, Nikolaos Tetradis, and Urs Achim Wiedemann
• E-Jahr: 2015
• Jahr: 3 March 2015
• Umfang: 5 S.
• Fussnoten: Gesehen am 24.11.2017
• Titel Quelle: Enthalten in: Physical review letters
• Ort Quelle: College Park, Md. : APS, 1958
• Jahr Quelle: 2015
• Band/Heft Quelle: 114(2015,9) Artikel-Nummer 091301, 5 Seiten
• ISSN Quelle: 1079-7114
• DOI: doi:10.1103/PhysRevLett.114.091301
• Datenträger: Online-Ressource
• Sprache: eng
• K10plus-PPN: 1565713419

Abstract

The dissipation of energy from local velocity perturbations in the cosmological fluid affects the time evolution of spatially averaged fluid dynamic fields and the cosmological solution of Einstein’s field equations. We show how this backreaction effect depends on shear and bulk viscosity and other material properties of the dark sector, as well as the spectrum of perturbations. If sufficiently large, this effect could account for the acceleration of the cosmological expansion.