Abstract
A long‐standing problem of theoretical physics is the exceptionally small value of the cosmological constant Λ ∼ 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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