非表示:
キーワード:
High Energy Physics - Theory, hep-th,General Relativity and Quantum Cosmology, gr-qc
要旨:
We revisit the classical theory of ten-dimensional two-derivative gravity
coupled to fluxes, scalar fields, D-branes, anti D-branes and
Orientifold-planes. We show that such set-ups do not give rise to a
four-dimensional positive curvature spacetime with the isometries of de Sitter
spacetime. We further argue that a de Sitter solution in type IIB theory may
still be achieved if the higher-order curvature corrections are carefully
controlled. Our analysis relies on the derivation of the de Sitter condition
from an explicit background solution by going beyond the supergravity limit of
type IIB theory. As such this also tells us how the background supersymmetry
should be broken and under what conditions D-term uplifting can be realized
with non self-dual fluxes.
