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- W1721132170 abstract "We investigate in detail the asymptotic properties of tachyon cosmology for a broad class of self-interaction potentials. The present approach relies in an appropriate re-definition of the tachyon field, which, in conjunction with a method formerly applied in the bibliography in a different context, allows 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 $Vproptophi^{-2lambda}$ the late-time attractor is always the de Sitter solution, while for sinh-like potentials $Vproptosinh^{-alpha}(lambdaphi)$, 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." @default.
- W1721132170 created "2016-06-24" @default.
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- W1721132170 date "2009-06-15" @default.
- W1721132170 modified "2023-09-27" @default.
- W1721132170 title "Dirac-Born-Infeld/Tachyon Fields Equivalence And Tachyon Dynamics" @default.
- W1721132170 hasPublicationYear "2009" @default.
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