Browsing by Author "Westphal, Alexander"

Now showing 1 - 3 of 3
  • Thumbnail Image
    Item
    Consistent de Sitter String Vacua from Kahler Stabilization and D-term uplifting
    (2007-03-02T12:33:41Z) Parameswaran, Susha L.; Westphal, Alexander; Physics; Elementary Particle Theory
    In this note, we review our construction of de Sitter vacua in type IIB flux compactifications, in which moduli stabilization and D-term uplifting can be combined consistently with the supergravity constraints. Here, the closed string fluxes fix the dilaton and the complex structure moduli while perturbative quantum corrections to the K\"ahler potential stabilize the volume Kahler modulus in an AdS_4-vacuum. Then, magnetized D7-branes provide consistent supersymmetric D-term uplifting towards dS_4. Based on hep-th/0602253.
  • Thumbnail Image
    Item
    de Sitter String Vacua from Kahler Uplifting
    (2006-12-11T09:59:04Z) Westphal, Alexander; Physics; Elementary Particle Theory
    We present a new way to construct de Sitter vacua in type IIB flux compactifications, in which the interplay of the leading perturbative and non-perturbative effects stabilize all moduli in dS vacua at parametrically large volume. Here, the closed string fluxes fix the dilaton and the complex structure moduli while the universal leading perturbative quantum correction to the Kahler potential together with non-perturbative effects stabilize the volume Kahler modulus in a dS_4-vacuum. Since the quantum correction is known exactly and can be kept parametrically small, this construction leads to calculable and explicitly realized de Sitter vacua of string theory with spontaneously broken supersymmetry.
  • Thumbnail Image
    Item
    de Sitter String Vacua from Perturbative Kahler Corrections and Consistent D-terms
    (2006-04-12T11:53:13Z) Parameswaran, Susha L.; Westphal, Alexander; Physics; Elementary Particle Theory
    We present a new way to construct de Sitter vacua in type IIB flux compactifications, in which moduli stabilization and D-term uplifting can be combined in a manner consistent with the supergravity constraints. Here, the closed string fluxes fix the dilaton and the complex structure moduli while perturbative quantum corrections to the Kahler potential stabilize the volume Kahler modulus in an AdS_4-vacuum. Then, the presence of magnetized D7-branes in this setup provide supersymmetric D-terms in a fully consistent way which uplift the AdS_4-vacuum to a metastable dS-minimum.