A study of tachyon dynamics for broad classes of potentials

Israel Quiros, Tame Gonzalez, Dania Gonzalez, Yunelsy Napoles, Ricardo García-Salcedo, Claudia Moreno

Resultado de la investigación: Contribución a una revistaArtículo

25 Citas (Scopus)

Resumen

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-∝ (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.

Idioma originalInglés
Número de artículo215021
PublicaciónClassical and Quantum Gravity
Volumen27
N.º21
DOI
EstadoPublicada - 7 nov 2010

Huella dactilar

cosmology
scaling
asymptotic properties
bibliographies
saddles
dynamical systems
critical point
interactions
scalars

Citar esto

Quiros, Israel ; Gonzalez, Tame ; Gonzalez, Dania ; Napoles, Yunelsy ; García-Salcedo, Ricardo ; Moreno, Claudia. / A study of tachyon dynamics for broad classes of potentials. En: Classical and Quantum Gravity. 2010 ; Vol. 27, N.º 21.
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A study of tachyon dynamics for broad classes of potentials. / Quiros, Israel; Gonzalez, Tame; Gonzalez, Dania; Napoles, Yunelsy; García-Salcedo, Ricardo; Moreno, Claudia.

En: Classical and Quantum Gravity, Vol. 27, N.º 21, 215021, 07.11.2010.

Resultado de la investigación: Contribución a una revistaArtículo

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