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25 papers · 2 filters
Geometric Transitions, Flops and Non-Kahler Manifolds: II
Melanie Becker, Keshav Dasgupta, Sheldon Katz +2
We continue our study of geometric transitions in type II and heterotic theories. In type IIB theory we discuss an F-theory setup which clarifies many of our earlier assumptions an…
Bulk Singularities and the Effective Cosmological Constant for Higher Co-dimension Branes
Andrew J. Tolley, C. P. Burgess, D. Hoover +1
We study a general configuration of parallel branes having co-dimension >2 situated inside a compact d-dimensional bulk space within the framework of a scalar and flux field couple…
Producing a Scale-Invariant Spectrum of Perturbations in a Hagedorn Phase of String Cosmology
Ali Nayeri, Robert H. Brandenberger, Cumrun Vafa
We study the generation of cosmological perturbations during the Hagedorn phase of string gas cosmology. Using tools of string thermodynamics we provide indications that it may be…
Brane gas-driven bulk expansion as a precursor stage to brane inflation
Natalia Shuhmaher, Robert Brandenberger
We propose a new way of obtaining slow-roll inflation in the context of higher dimensional models motivated by string and M theory. In our model, all extra spatial dimensions are o…
Gravitational Waves in a Codimension Two Braneworld
Claudia de Rham, Andrew J. Tolley
We consider the propagation of gravitational waves in six dimensions induced by sources living on 3-branes in the context of a recent exact solution hep-th/0506050. The brane geome…
Aspects of brane-antibrane inflation
James M. Cline
I describe a dynamical mechanism for solving the fine-tuning problem of brane-antibrane inflation. By inflating with stacks of branes and antibranes, the branes can naturally be tr…