Dark radiation in LARGE volume models
PHYSICAL REVIEW D 87:4 (2013) ARTN 043520
Soft supersymmetry breaking in anisotropic LARGE volume compactifications
JOURNAL OF HIGH ENERGY PHYSICS (2013) ARTN 071
Quantum Gravity Constraints on Inflation
ArXiv 1203.5476 (2012)
Abstract:
We study quantum gravity constraints on inflationary model building. Our approach is based on requiring the entropy associated to a given inflationary model to be less than that of the de Sitter entropy. We give two prescriptions for determining the inflationary entropy, based on either `bits per unit area' or entanglement entropy. The existence of transPlanckian flat directions, necessary for large tensor modes in the CMB, correlates with an inflationary entropy greater than that allowed by de Sitter space. Independently these techniques also constrain or exclude de Sitter models with large-rank gauge groups and high UV cutoffs, such as racetrack inflation or the KKLT construction.Brane-Antibrane Backreaction in Axion Monodromy Inflation
ArXiv 1110.6454 (2011)
Abstract:
We calculate the interaction potential between D5 and anti-D5 branes wrapping distant but homologous 2-cycles. The interaction potential is logarithmic in the separation radius and does not decouple at infinity. We show that logarithmic backreaction is generic for 5-branes wrapping distant but homologous 2-cycles, and we argue that this destabilises models of axion monodromy inflation involving NS5 brane-antibrane pairs in separate warped throats towards an uncontrolled region.Scattering and Sequestering of Blow-Up Moduli in Local String Models
ArXiv 1109.4153 (2011)