Journal
PHYSICAL REVIEW D
Volume 82, Issue 6, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevD.82.063534
Keywords
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Funding
- CAPES
- CNPq
- FAPESP, Brazil
- FCT, Portugal
- STFC [PP/F000057/1, PP/D000955/1, ST/G002355/1] Funding Source: UKRI
- Science and Technology Facilities Council [PP/F000057/1, PP/D000955/1, ST/G002355/1] Funding Source: researchfish
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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.
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