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Energy's and amplitudes' positivity
Alberto Nicolis, Riccardo Rattazzi, Enrico Trincherini
In QFT, the null energy condition (NEC) for a classical field configuration is usually associated with that configuration's stability against small perturbations, and with the sub-…
Equivalence Principle Implications of Modified Gravity Models
Lam Hui, Alberto Nicolis, Christopher Stubbs
Theories that attempt to explain the observed cosmic acceleration by modifying general relativity all introduce a new scalar degree of freedom that is active on large scales, but i…
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 Origin of the Universe as Revealed Through the Polarization of the Cosmic Microwave Background
S. Dodelson, R. Easther, S. Hanany +61
Modern cosmology has sharpened questions posed for millennia about the origin of our cosmic habitat. The age-old questions have been transformed into two pressing issues primed for…
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…