Facta universitatis - series: Physics, Chemistry and Technology 2019 Volume 17, Issue 1, spec.issue, Pages: 79-87
https://doi.org/10.2298/FUPCT1901079S
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Inflationary RSII model with a matter in the bulk and exponential potential of tachyon field
Stojanović Marko 
(Faculty of Medicine, University of Niš, Niš, Serbia)
Bilić Neven (Division of Theoretical Physics, Rudjer Bošković Institute, Zagreb, Croatia)
Dimitrijević Dragoljub D. (Department of Physics, Faculty of Science and Mathematics, University of Niš, Niš, Serbia)
Đorđević Goran S. (Department of Physics, Faculty of Science and Mathematics, University of Niš, Niš, Serbia)
Milošević Milan (Department of Physics, Faculty of Science and Mathematics, University of Niš, Niš, Serbia)
In this paper, we study a tachyon cosmological model based on the dynamics
of a 3-brane in the second Randall-Sundrum (RSII) model extended to include
matter in the bulk. The presence of matter in the bulk changes the warp
factor which leads to the modification of inflationary dynamics. The
additional brane behaves effectively as a tachyon. We calculate numerically
observation parameters of inflation: the scalar spectral index (ns) and the
tensor-to-scalar ratio (r) for the exponential potential of the tachyon
field.
Keywords: DBI Lagrangians, tachyonic inflation, generalized RSII model
Project of the Serbian Ministry of Education, Science and
Technological Development, Grant no. 176021, Grant no. 174020 and Grant no.
176003