Duality linking standard and tachyon scalar field cosmologies

Details Duality linking standard and tachyon scalar field cosmologies Duality linking standard and tachyon scalar field cosmologies

2010-06-10

arxiv.org/abs/1006.2110v1

Phys.Rev.D82:063534,2010

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

8 pages

Scientific paper

10.1103/PhysRevD.82.063534

In this work we investigate the duality linking standard and tachyon scalar field cosmologies. 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.

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