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Isotropization in Bianchi type-I cosmological model with fermions and bosons interacting via Yukawa potential | | M. O. Ribas
; L. L. Samojeden
; F. P. Devecchi
; G. M. Kremer
; | | Date: |
5 Oct 2015 | | Abstract: | 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. | | Source: | arXiv, 1510.1345 | | Services: | Forum | Review | PDF | Favorites | |
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