Browsing by Author "Parameswaran, Susha L."

Now showing 1 - 3 of 3
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    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.
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    Gauge Fields, Fermions and Mass Gaps in 6D Brane Worlds
    (2006-09-07T11:33:08Z) Parameswaran, Susha L.; Randjbar-Daemi, S.; Salvio, Alberto; Physics; Elementary Particle Theory
    We study fluctuations about axisymmetric warped brane solutions in 6D minimal gauged supergravity. Much of our analysis is general and could be applied to other scenarios. We focus on bulk sectors that could give rise to Standard Model gauge fields and charged matter. We reduce the dynamics to Schroedinger type equations plus physical boundary conditions, and obtain exact solutions for the Kaluza-Klein wave functions and discrete mass spectra. The power-law warping, as opposed to exponential in 5D, means that zero mode wave functions can be peaked on negative tension branes, but only at the price of localizing the whole Kaluza-Klein tower there. However, remarkably, the codimension two defects allow the Kaluza-Klein mass gap to remain finite even in the infinite volume limit. In principle, not only gravity, but Standard Model fields could `feel' the extent of large extra dimensions, and still be described by an effective 4D theory.
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    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.