New solutions with accelerated expansion in string theory

DODELSON, MATTHEW; DONG, XI; SILVERSTEIN, EVA; TORROBA, GONZALO

JOURNAL OF HIGH ENERGY PHYSICS

SPRINGER

Año: 2014 vol. 2014

1126-6708

Abstract: We present concrete solutions with accelerated expansion in string theory, requiring a small, tractable list of stress energy sources. We explain how this construction (and others in progress) evades previous no go theorems for simple accelerating solutions. Our solutions respect an approximate scaling symmetry and realize discrete sequences of values for the equation of state, including one with an accumulation point at w = −1 and another accumulating near w = −1/3 from below. In another class of models, a density of defects generates scaling solutions with accelerated expansion. We briefly discuss potential applications to dark energy phenomenology, and to holography for cosmology.