Accelerating universes from compactification on a warped conifold.
We find a cosmological solution corresponding to the compactification of 10D supergravity on a warped conifold that easily circumvents the "no-go" theorem given for a warped or flux compactification, providing new perspectives for the study of supergravity or superstring theory in cosmological backgrounds. With fixed volume moduli of the internal space, the model can explain a physical Universe undergoing an accelerated expansion in the 4D Einstein frame, for a sufficiently long time. The solution found in the limit that the warp factor dependent on the radial coordinate y is extremized (giving a constant warping) is smooth and it supports a flat four-dimensional Friedmann-Robertson-Walker cosmology undergoing a period of accelerated expansion with slowly rolling or stabilized volume moduli.
Neupane
Ishwaree P
IP
Department of Physics and Astronomy, University of Canterbury, Private Bag 4800, Christchurch 8020, New Zealand.