Entropy Bounds and Dark Energy
Abstract
Description
Entropy bounds render quantum corrections to the cosmological constant $Λ$ finite. Under certain assumptions, the natural value of $Λ$ 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 $w \equiv p / ρ= 0$ over cosmological distances, and is strongly disfavored by observational data. Alternatively, $Λ$ in these scenarios might account for the diffuse dark matter component of the cosmological energy density.
6 pages, Latex. Added discussion of non-cosmological limits on holographic dark energy. Version to appear in Physics Letters B
6 pages, Latex. Added discussion of non-cosmological limits on holographic dark energy. Version to appear in Physics Letters B