Entropy Bounds and Dark Energy

Details Entropy Bounds and Dark Energy Entropy Bounds and Dark Energy

2004-03-03

arxiv.org/abs/hep-th/0403052v2

Phys.Lett.B594:13-16,2004

Physics

High Energy Physics

High Energy Physics - Theory

6 pages, Latex. Added discussion of non-cosmological limits on holographic dark energy. Version to appear in Physics Letters B

Scientific paper

10.1016/j.physletb.2004.05.020

Entropy bounds render quantum corrections to the cosmological constant $\Lambda$ finite. Under certain assumptions, the natural value of $\Lambda$ is of order the observed dark energy density $\sim 10^{-10} {\rm eV}^4$, thereby resolving the cosmological constant problem. We note that the dark energy equation of state in these scenarios is $w \equiv p / \rho = 0$ over cosmological distances, and is strongly disfavored by observational data. Alternatively, $\Lambda$ in these scenarios might account for the diffuse dark matter component of the cosmological energy density.

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