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13 papers · 1 filter
Superluminality in DGP
Kurt Hinterbichler, Alberto Nicolis, Massimo Porrati
We reconsider the issue of superluminal propagation in the DGP model of infrared modified gravity. Superluminality was argued to exist in certain otherwise physical backgrounds by…
On the exact solution of the accelerating string in space
Bo-Wen Xiao
In this letter, the exact accelerating string solution of a heavy quark-antiquark pair is found in space. On the accelerating string, there is a particular scale which sepa…
Instabilities of chromodyons in SO(5) gauge theory
Huidong Guo, Erick J. Weinberg
Attempts to construct chromodyons - objects with both magnetic charge and non-Abelian electric charge - in the context of spontaneously broken gauge theories have been thwarted in…
Simple Bounds from the Perturbative Regime of Inflation
Louis Leblond, Sarah Shandera
We examine the conditions under which a perturbative expansion around an inflating background is valid. When inflation is driven by a single field with a general sound speed, we fi…
Pseudo-redundant vacuum energy
Puneet Batra, Kurt Hinterbichler, Lam Hui +1
We discuss models that can account for today's dark energy. The underlying cosmological constant may be Planck scale but starts as a redundant coupling which can be eliminated by a…
Two-Loop Superstrings VII, Cohomology of Chiral Amplitudes
Eric D'Hoker, D. H. Phong
The relation between superholomorphicity and holomorphicity of chiral superstring N-point amplitudes for NS bosons on a genus 2 Riemann surface is shown to be encoded in a hybrid c…