A1 Refereed original research article in a scientific journal
Gravitational particle creation in a stiff matter dominated universe
Authors: Lankinen J, Vilja I
Publisher: IOP PUBLISHING LTD
Publishing place: BRISTOL
Publication year: 2017
Journal: Journal of Cosmology and Astroparticle Physics
Journal name in source: JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
Journal acronym: J COSMOL ASTROPART P
Article number: ARTN 025
Issue: 8
Number of pages: 12
ISSN: 1475-7516
eISSN: 1475-7516
DOI: https://doi.org/10.1088/1475-7516/2017/08/025
Web address : 10.1088/1475-7516/2017/08/025
Abstract
A scenario for gravitational particle creation in a stiff matter dominated flat Friedmann-Robertson-Walker universe is presented. The primary creation of scalar particles is calculated using quantum field theory in curved spacetime and it is found to be strongly dependent on the scalar mass and the expansion parameter of the universe. The particle creation is most effective for a very massive scalar field and large expansion parameter. We demonstrate the phenomenon by applying it to cosmological toy model scenario, where secondary particles are created by the scalar field decay.
A scenario for gravitational particle creation in a stiff matter dominated flat Friedmann-Robertson-Walker universe is presented. The primary creation of scalar particles is calculated using quantum field theory in curved spacetime and it is found to be strongly dependent on the scalar mass and the expansion parameter of the universe. The particle creation is most effective for a very massive scalar field and large expansion parameter. We demonstrate the phenomenon by applying it to cosmological toy model scenario, where secondary particles are created by the scalar field decay.
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