Isotropization in Bianchi type-I cosmological model with fermions and bosons interacting via Yukawa potential

In this work we investigate a model for the early Universe in a Bianchi type-I metric, where the sources of the gravitational field are a fermionic and a bosonic field, interacting through a Yukawa potential, following the standard model of elementary particles. It is shown that the fermionic field...

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Bibliographic Details
Published in:Physica scripta 2015-10, Vol.90 (10), p.105001-6
Main Authors: Ribas, M O, Samojeden, L L, Devecchi, F P, Kremer, G M
Format: Article
Language:English
Subjects:
Bianchi
Bosons
Constants
Cosmology
Deceleration
Elementary particles
fermions
Gravitational fields
Universe
Yukawa potential
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Summary:In this work we investigate a model for the early Universe in a Bianchi type-I metric, where the sources of the gravitational field are a fermionic and a bosonic field, interacting through a Yukawa potential, following the standard model of elementary particles. It is shown that the fermionic field has a negative pressure, while the boson has a small positive pressure. The fermionic field is the responsible for an accelerated regime at early times, but since the total pressure tends to zero for large times, a transition to a decelerated regime occurs. Here the Yukawa potential answers for the duration of the accelerated regime, since by decreasing the value of its coupling constant the transition accelerated-decelerated occurs in later times. The isotropization which occurs for late times is due to the presence of the fermionic field as one of the sources of the gravitational field.
ISSN:0031-8949
1402-4896
DOI:10.1088/0031-8949/90/10/105001