Quantum infrared fluctuations of the conformal mode screen g=G_N H^2/pi with beta(g)=-(1/2)g^2, predicting logarithmic decay of dark energy and a UV fixed point at minimal entropy S=2.
Dark Energy and String Theory
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abstract
A radiatively stable de Sitter spacetime is constructed by considering an intrinsically non-commutative and generalized-geometric formulation of string theory, which is related to a family of F-theory models endowed with non-trivial anisotropic axion-dilaton backgrounds. In particular, the curvature of the canonically conjugate dual space provides for a positive cosmological constant to leading order, that satisfies a radiatively stable see-saw-like formula, which in turn induces the dark energy in the observed spacetime. We also comment on the non-commutative phase of the non-perturbative formulations of string theory/quantum gravity implied by this approach.
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de Sitter duality and logarithmic decay of dark energy
Quantum infrared fluctuations of the conformal mode screen g=G_N H^2/pi with beta(g)=-(1/2)g^2, predicting logarithmic decay of dark energy and a UV fixed point at minimal entropy S=2.