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http://repositoriodigital.ipn.mx/handle/123456789/11448| Título : | A STUDY OF TACHYON DYNAMICS FOR BROAD CLASSES OF POTENTIALS |
| Fecha de publicación : | 16-ene-2013 |
| Editorial : | CLASSICAL AND QUANTUM GRAVITY |
| Descripción : | We investigate in detail the asymptotic properties of tachyon cosmology for a broad class of self-interaction potentials. The present approach relies on an appropriate re-definition of the tachyon field, which, in conjunction with a method formerly applied in the bibliography in a different context allows us to generalize the dynamical systems study of tachyon cosmology to a wider class of self-interaction potentials beyond the (inverse) square-law one. It is revealed that independent of the functional form of the potential, the matter-dominated solution and the ultra-relativistic (also matter-dominated) solution are always associated with equilibrium points in the phase space of the tachyon models. The latter is always the past attractor, while the former is a saddle critical point. For inverse power-law potentials V ∝ φ−2λ the late-time attractor is always the de Sitter solution, while for sinh-like potentials V ∝ sinh−α(λφ), depending on the region of parameter space, the late-time attractor can be either the inflationary tachyon-dominated solution or the matter-scaling (also inflationary) phase. In general, for most part of known quintessential potentials, the late-time dynamics will be associated either with de Sitter inflation, or with matter-scaling, or with scalar field-dominated solutions. |
| URI : | http://www.repositoriodigital.ipn.mx/handle/123456789/11448 |
| Otros identificadores : | 1361-6382 http://hdl.handle.net/123456789/975 |
| Aparece en las colecciones: | Doctorado |
Ficheros en este ítem:
| Fichero | Descripción | Tamaño | Formato | |
|---|---|---|---|---|
| 13Quiros_2010.pdf | 40.4 kB | Adobe PDF | Visualizar/Abrir |
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