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arXiv · 1203.1750

De Sitter String Vacua from Dilaton-dependent Non-perturbative Effects

Michele Cicoli·Anshuman Maharana·F. Quevedo·C. P. Burgess
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Abstract

We consider a novel scenario for modulus stabilisation in IIB string compactifications in which the Kahler moduli are stabilised by a general set-up with two kinds of non-perturbative effects: (i) standard Kahler moduli-dependent non-perturbative effects from gaugino condensation on D7-branes or E3-instantons wrapping four-cycles in the geometric regime; (ii) dilaton-dependent non-perturbative effects from gaugino condensation on space-time filling D3-branes or E(-1)-instantons at singularities. For the LARGE Volume Scenario (LVS), the new dilaton-dependent non-perturbative effects provide a positive definite contribution to the scalar potential that can be arbitrarily tuned from fluxes to give rise to de Sitter vacua. Contrary to anti D3-branes at warped throats, this term arises from a manifestly supersymmetric effective action. In this new scenario the "uplifting" term comes from F-terms of blow-up modes resolving the singularity of the non-perturbative quiver. We discuss phenomenological and cosmological implications of this mechanism. This set-up also allows a realisation of the LVS for manifolds with zero or positive Euler number.

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Michele Cicoli, Anshuman Maharana, F. Quevedo, C. P. Burgess. 2012-03-08. De Sitter String Vacua from Dilaton-dependent Non-perturbative Effects. https://doi.org/10.1007/jhep06(2012)011

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