303 citations · 395 across the 3 of their papers we have counts for
4 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…
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…
Starting the Universe: Stable Violation of the Null Energy Condition and Non-standard Cosmologies
Paolo Creminelli, Markus A. Luty, Alberto Nicolis +1
We present a consistent effective theory that violates the null energy condition (NEC) without developing any instabilities or other pathological features. The model is the ghost c…
Causality, Analyticity and an IR Obstruction to UV Completion
Allan Adams, Nima Arkani-Hamed, Sergei Dubovsky +2
We argue that certain apparently consistent low-energy effective field theories described by local, Lorentz-invariant Lagrangians, secretly exhibit macroscopic non-locality and can…