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15 papers · 2 filters
Mass Screening in Modified Gravity
Gregory Gabadadze, Alberto Iglesias
Models of modified gravity introduce extra degrees of freedom, which for consistency with the data, should be suppressed at observable scales. In the models that share properties o…
Strong CP Problem with 10^{32} Standard Model Copies
Gia Dvali, Glennys R. Farrar
We show that a recently proposed solution to the Hierarchy Problem simultaneously solves the Strong CP Problem, without requiring an axion or any further new physics. Consistency o…
Spectral Flow in AdS(3)/CFT(2)
Gaston Giribet, Ari Pakman, Leonardo Rastelli
We study the spectral flowed sectors of the H3 WZW model in the context of the holographic duality between type IIB string theory in AdS(3)x S^3 x T^4 with NSNS flux and the symmet…
When Worlds Collide
Spencer Chang, Matthew Kleban, Thomas S. Levi
We analyze the cosmological signatures visible to an observer in a Coleman-de Luccia bubble when another such bubble collides with it. We use a gluing procedure to generalize the r…
Cascading DGP
Claudia de Rham, Gia Dvali, Stefan Hofmann +4
We present a higher codimension generalization of the DGP scenario which, unlike previous attempts, is free of ghost instabilities. The 4D propagator is made regular by embedding o…
Dressed Domain Walls and Holography
Luca Grisa, Oriol Pujolas
The cutoff version of the AdS/CFT correspondence states that the Randall Sundrum scenario is dual to a Conformal Field Theory (CFT) coupled to gravity in four dimensions. The gravi…