Tachyon Field in Cosmology
| dc.creator | Jassal, H. K. | |
| dc.date | 2003-03-18 | |
| dc.date.accessioned | 2026-07-07T11:08:11Z | |
| dc.date.available | 2026-07-07T11:08:11Z | |
| dc.description | We study cosmological effects of homogeneous tachyon field as dark energy. We concentrate on two different scalar field potentials, the inverse square potential and the exponential potential. These models have a unique feature that the matter density parameter and the density parameter for tachyons remain comparable for a large range in redshift. It is shown that there exists a range of parameters for which the universe undergoes an accelerated expansion and the evolution is consistent with structure formation requirements. For a viable model we require fine tuning of parameters comparable to that in LCDM or in quintessence models. For the exponential potential, the accelerated phase is followed by a phase with a(t)~ t^{2/3} thus eliminating a future horizon. | |
| dc.description | 3 pages, based on talk at PASCOS'03. To appear in special issue of Pramana | |
| dc.identifier | https://arxiv.org/abs/astro-ph/0303406 | |
| dc.identifier | http://arxiv.org/abs/astro-ph/0303406 | |
| dc.identifier | Pramana62:757-760,2004 | |
| dc.identifier | doi:10.1007/BF02705364 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/190053 | |
| dc.subject | Astrophysics | |
| dc.subject | General Relativity and Quantum Cosmology | |
| dc.subject | High Energy Physics - Theory | |
| dc.title | Tachyon Field in Cosmology | |
| dc.type | text |