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- Brookhaven National LaboratoryUS159 papers
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5 papers · 2 filters
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…
The "in-in" Formalism and Cosmological Perturbations
Peter Adshead, Richard Easther, Eugene A. Lim
We describe an efficient scheme for evaluating higher order contributions to primordial cosmological perturbations using the "in-in" formalism, which is the basis of modern calcula…
Stochastic trailing string and Langevin dynamics from AdS/CFT
G. C. Giecold, E. Iancu, A. H. Mueller
Using the gauge/string duality, we derive a set of Langevin equations describing the dynamics of a relativistic heavy quark moving with constant average speed through the strongly-…
Interactions of massless monopole clouds
Christopher M. Miller, Erick J. Weinberg
Some spontaneously broken gauge theories with unbroken non-Abelian gauge groups contain massless magnetic monopoles that are realized classically as clouds of non-Abelian field sur…
Eternal Inflation, Bubble Collisions, and the Disintegration of the Persistence of Memory
Ben Freivogel, Matthew Kleban, Alberto Nicolis +1
We compute the probability distribution for bubble collisions in an inflating false vacuum which decays by bubble nucleation. Our analysis generalizes previous work of Guth, Garrig…