Showing 2008 · hep-thShow all

16 papers · 2 filters

hep-th2008★ 12 cited

Micro Black Holes and the Democratic Transition

Gia Dvali, Oriol Pujolas

Unitarity implies that the evaporation of microscopic quasi-classical black holes cannot be universal in different particle species. This creates a puzzle, since it conflicts with…

hep-th2008★ 89 cited

Quantum Information and Gravity Cutoff in Theories with Species

Gia Dvali, Cesar Gomez

We show that lowering of the gravitational cutoff relative to the Planck mass, imposed by black hole physics in theories with N species, has an independent justification from quant…

hep-th2008★ 53 cited

A Model Independent Ultraviolet Cutoff for Theories with Charged Massive Higher Spin Fields

Massimo Porrati, Rakibur Rahman

We argue that the theory of a massive higher spin field coupled to electromagnetism in flat space possesses an intrinsic, model independent, finite upper bound on its UV cutoff. By…

hep-th2008★ 61 cited

Watching Worlds Collide: Effects on the CMB from Cosmological Bubble Collisions

Spencer Chang, Matthew Kleban, Thomas S. Levi

We extend our previous work on the cosmology of Coleman-de Luccia bubble collisions. Within a set of approximations we calculate the effects on the cosmic microwave background (CMB…

hep-th2008★ 12 cited

General Massive Spin-2 on de Sitter Background

Gregory Gabadadze, Alberto Iglesias, Yanwen Shang

We study linearized massive gravity on the de Sitter background. With a small-enough graviton mass this may have had relevance to inflation, or the present-day cosmic acceleration.…

hep-th2008★ 75 cited

Topologically Massive Gravity at the Chiral Point is Not Unitary

Gaston Giribet, Matthew Kleban, Massimo Porrati

A recent paper [arXiv:0801.4566] claims that topologically massive gravity contains only chiral boundary excitations at a particular value of the Chern-Simons coupling. On the othe…