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24 papers · 2 filters
Effective Field Theories and Matching for Codimension-2 Branes
C. P. Burgess, D. Hoover, C. de Rham +1
It is generic for the bulk fields sourced by branes having codimension two and higher to diverge at the brane position, much as does the Coulomb potential at the position of its so…
1/N Effects in Non-Relativistic Gauge-Gravity Duality
Allan Adams, Alexander Maloney, Aninda Sinha +1
We argue that higher-curvature terms in the gravitational Lagrangian lead, via non-relativistic gauge-gravity duality, to finite renormalization of the dynamical exponent of the du…
Axionic D3-D7 Inflation
C. P. Burgess, J. M. Cline, M. Postma
We study the motion of a D3 brane moving within a Type IIB string vacuum compactified to 4D on K3 x T_2/Z_2 in the presence of D7 and O7 planes. We work within the effective 4D sup…
A Nonsingular Cosmology with a Scale-Invariant Spectrum of Cosmological Perturbations from Lee-Wick Theory
Yi-Fu Cai, Taotao Qiu, Robert Brandenberger +1
We study the cosmology of a Lee-Wick type scalar field theory. First, we consider homogeneous and isotropic background solutions and find that they are nonsingular, leading to cosm…
Minimal Simple de Sitter Solutions
Sheikh Shajidul Haque, Gary Shiu, Bret Underwood +1
We show that the minimal set of necessary ingredients to construct explicit, four-dimensional de Sitter solutions from IIA string theory at tree-level are O6-planes, non-zero Roman…
Gravitational Radiation by Cosmic Strings in a Junction
Robert Brandenberger, Hassan Firouzjahi, Johanna Karouby +1
The formalism for computing the gravitational power radiation from excitations on cosmic strings forming a junction is presented and applied to the simple case of co-planar strings…