Duality linking standard and tachyon scalar field cosmologies

作者：Avelino P P^*; Bazeia D; Losano L; Oliveira J C R E; Pavan A B

来源：Physical Review D - Particles, Fields, Gravitation and Cosmology, 2010, 82(6): 063534.

DOI：10.1103/PhysRevD.82.063534

In this work we investigate the duality linking standard and tachyon scalar field homogeneous and isotropic cosmologies in N + 1 dimensions. We determine the transformation between standard and tachyon scalar fields and between their associated potentials, corresponding to the same background evolution. We show that, in general, the duality is broken at a perturbative level, when deviations from a homogeneous and isotropic background are taken into account. However, we find that for slow-rolling fields the duality is still preserved at a linear level. We illustrate our results with specific examples of cosmological relevance, where the correspondence between scalar and tachyon scalar field models can be calculated explicitly.

• 出版日期2010-9-30