DBI analog of a decaying vacuum cosmology

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2013-07-10
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Bessada, Dennis [UNIFESP]
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In this work I discuss the dynamical and thermodynamical equivalence between a general k-essence scalar field cosmology and an arbitrary cosmological model with a decaying vacuum, thus generalizing the approach proposed by Maia and Lima [Phys. Rev. D 65, 083513 (2002)]. the formalism obtained is quite general and holds for any noncanonical scalar field model. As a special case I derive a Dirac-Born-Infeld model with an exponential potential and constant speed of sound, and show that it is equivalent to a cosmological model with decay law Lambda(H) = 3 beta H-2.
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Physical Review D. College Pk: Amer Physical Soc, v. 88, n. 2, 8 p., 2013.
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