A Note on the Cardy-Verlinde Formula

Details A Note on the Cardy-Verlinde Formula A Note on the Cardy-Verlinde Formula

2002-01-31

arxiv.org/abs/hep-th/0201268v1

Phys.Lett. B531 (2002) 276-280

Physics

High Energy Physics

High Energy Physics - Theory

9 pages, LaTeX

Scientific paper

10.1016/S0370-2693(02)01497-1

We generalize the results of hep-th/0008140 to the case of the (n+1)-dimensional closed FRW universe satisfying a general equation of state of the form p=w\rho. We find that the entropy of the universe can no longer be expressed in a form similar to the Cardy formula, when w\neq 1/n. As a result, in general the entropy formula does not coincide with the Friedmann equation when the conjectured bound on the Casimir energy is saturated. Furthermore, the conjectured bound on the Casimir energy generally does not lead to the Hubble and the Bekenstein entropy bounds.

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