Affiliation:
1. Faculty of Science and Mathematics, Niš
Abstract
The role tachyon fields may play in evolution of early universe is discussed
in this paper. We consider the evolution of a flat and homogeneous universe
governed by a tachyon scalar field with the DBI-type action and calculate the
slow-roll parameters of inflation, scalar spectral index (n), and
tensor-scalar ratio (r) for the given potentials. We pay special attention to
the inverse power potential, first of all to V (x) ~ x?4, and compare the
available results obtained by analytical and numerical methods with those
obtained by observation. It is shown that the computed values of the
observational parameters and the observed ones are in a good agreement for
the high values of the constant X0. The possibility that influence of the
radion field can extend a range of the acceptable values of the constant X0
to the string theory motivated sector of its values is briefly considered.
Funder
Ministry of Education, Science and Technological Development of the Republic of Serbia
Publisher
National Library of Serbia
Subject
Astronomy and Astrophysics
Cited by
4 articles.
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