Dark Energy from Strings

Details Dark Energy from Strings Dark Energy from Strings

2002-02-10

arxiv.org/abs/hep-th/0202063v1

Physics

High Energy Physics

High Energy Physics - Theory

10 pages LaTeX. Talk at Coral Gables Conference, December 12-16, 2001

Scientific paper

10.1063/1.1492154

A long-standing problem of theoretical physics is the exceptionally small value of the cosmological constant $\Lambda \sim 10^{-120}$ measured in natural Planckian units. Here we derive this tiny number from a toroidal string cosmology based on closed strings. In this picture the dark energy arises from the correlation between momentum and winding modes that for short distances has an exponential fall-off with increasing values of the momenta. The freeze-out by the expansion of the background universe for these transplanckian modes may be interpreted as a frozen condensate of the closed-string modes in the three non-compactified spatial dimensions.

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