Physics – High Energy Physics – High Energy Physics - Theory
Scientific paper
2010-09-15
Physics
High Energy Physics
High Energy Physics - Theory
21 pages, 6 figures. In the new version, sections I, IV and VI have been improved, and two words have been added at the beginn
Scientific paper
We study some problems arising from the introduction of a complex scalar field in cosmology, modelling its possible behaviors in both the inflationary and dark energy stages of the universe. Such examples contribute to show that, while the complex nature of the scalar field can be indeed important during inflation, it loses its meaning in the later dark-energy dominated era of cosmology, when the phase of the complex field is practically constant, and there is indeed a transition from complex to real scalar field. In our considerations, the Noether symmetry approach turns out to be a useful tool once again. We arrive eventually at a potential containing the sixth and fourth powers of the scalar field, and the resulting semiclassical quantum cosmology is studied to gain a better understanding of the inflationary stage.
Esposito Giampiero
Roychowdhury Raju
Rubano Claudio
Scudellaro Paolo
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