Perturbations in a holographic universe and in other stiff fluid cosmologies

T. J. Battefeld, D. A. Easson

Research output: Contribution to journalArticlepeer-review

15 Scopus citations


We examine the generation and evolution of perturbations in a universe dominated by a fluid with stiff equation of state p = ρ. The recently proposed holographic universe is an example of such a model. We compute the spectrum of scalar and tensor perturbations, without relying on a microphysical description of the p = ρ fluid. The spectrum is scale invariant deep inside the Hubble horizon. In contrast, infrared perturbations that enter the Hubble horizon during the stiff fluid dominated (holographic) phase yield oscillatory and logarithmic terms in the power spectrum. We show that vector perturbations grow during the stiff fluid dominated epoch and may result in a turbulent and anisotropic universe at the end of the holographic phase. Therefore, the required period of inflation following the holographic phase cannot be much shorter than that required in standard inflationary models.

Original languageEnglish (US)
Article number103516
Pages (from-to)103516-1-103516-7
JournalPhysical Review D - Particles, Fields, Gravitation and Cosmology
Issue number10
StatePublished - Nov 2004
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)


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