Dynamics of tachyon fields and inflation - comparison of analytical and numerical results with observation
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)...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
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Astronomical Observatory, Department of Astronomy, Belgrade
2016-01-01
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| Series: | Serbian Astronomical Journal |
| Subjects: | |
| Online Access: | http://www.doiserbia.nb.rs/img/doi/1450-698X/2016/1450-698X1600003M.pdf |
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| author | Milošević M. Dimitrijević D.D. Đorđević G.S. Stojanović M.D. |
| author_facet | Milošević M. Dimitrijević D.D. Đorđević G.S. Stojanović M.D. |
| author_sort | Milošević M. |
| collection | DOAJ |
| description | 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.
[Projekat Ministarstva nauke Republike Srbije, br. 176021, br. 174020 i br.
43011] |
| first_indexed | 2024-12-12T19:03:50Z |
| format | Article |
| id | doaj.art-3e85b719a70d413d8cadd18925393d8b |
| institution | Directory Open Access Journal |
| issn | 1450-698X 1820-9289 |
| language | English |
| last_indexed | 2024-12-12T19:03:50Z |
| publishDate | 2016-01-01 |
| publisher | Astronomical Observatory, Department of Astronomy, Belgrade |
| record_format | Article |
| series | Serbian Astronomical Journal |
| spelling | doaj.art-3e85b719a70d413d8cadd18925393d8b2022-12-22T00:15:00ZengAstronomical Observatory, Department of Astronomy, BelgradeSerbian Astronomical Journal1450-698X1820-92892016-01-0120161921810.2298/SAJ160312003M1450-698X1600003MDynamics of tachyon fields and inflation - comparison of analytical and numerical results with observationMilošević M.0Dimitrijević D.D.1Đorđević G.S.2Stojanović M.D.3Faculty of Science and Mathematics, NišFaculty of Science and Mathematics, NišFaculty of Science and Mathematics, NišFaculty of Science and Mathematics, NišThe 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. [Projekat Ministarstva nauke Republike Srbije, br. 176021, br. 174020 i br. 43011]http://www.doiserbia.nb.rs/img/doi/1450-698X/2016/1450-698X1600003M.pdfcosmology: theorycosmological parametersearly Universe |
| spellingShingle | Milošević M. Dimitrijević D.D. Đorđević G.S. Stojanović M.D. Dynamics of tachyon fields and inflation - comparison of analytical and numerical results with observation Serbian Astronomical Journal cosmology: theory cosmological parameters early Universe |
| title | Dynamics of tachyon fields and inflation - comparison of analytical and numerical results with observation |
| title_full | Dynamics of tachyon fields and inflation - comparison of analytical and numerical results with observation |
| title_fullStr | Dynamics of tachyon fields and inflation - comparison of analytical and numerical results with observation |
| title_full_unstemmed | Dynamics of tachyon fields and inflation - comparison of analytical and numerical results with observation |
| title_short | Dynamics of tachyon fields and inflation - comparison of analytical and numerical results with observation |
| title_sort | dynamics of tachyon fields and inflation comparison of analytical and numerical results with observation |
| topic | cosmology: theory cosmological parameters early Universe |
| url | http://www.doiserbia.nb.rs/img/doi/1450-698X/2016/1450-698X1600003M.pdf |
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