Three thermodynamically based parametrizations of the deceleration parameter

Sergio Del Campo, Ivan Duran, Ramón Herrera, Diego Pavón

Research output: Contribution to journalArticleResearchpeer-review

79 Citations (Scopus)


We propose and constrain with the latest observational data, three model-independent parametrizations of the cosmic deceleration parameter q(z). They are well behaved and stay finite at all redshifts. We construct them by fixing the value of q at high redshift, q(z1)=1/2 (as demanded by cosmic structure formation), and at the far future q(z=-1)=-1, and smoothly interpolating q(z) between them. The fixed point at z=-1 is not arbitrarily chosen; it readily follows from the second law of thermodynamics. This fairly reduces the ample latitude in parametrizing q(z). © 2012 American Physical Society.
Original languageEnglish
Article number083509
JournalPhysical Review D - Particles, Fields, Gravitation and Cosmology
Issue number8
Publication statusPublished - 8 Oct 2012


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