547 citations · 5.4k across the 133 of their papers we have counts for
3 papers · 1 filter
The Refractive Index of Curved Spacetime: the Fate of Causality in QED
Timothy J. Hollowood, Graham M. Shore
It has been known for a long time that vacuum polarization in QED leads to a superluminal low-frequency phase velocity for light propagating in curved spacetime. Assuming the valid…
Causality and Micro-Causality in Curved Spacetime
Timothy J. Hollowood, Graham M. Shore
We consider how causality and micro-causality are realised in QED in curved spacetime. The photon propagator is found to exhibit novel non-analytic behaviour due to vacuum polariza…
Topology change in commuting saddles of thermal N=4 SYM theory
Umut Gursoy, Sean A. Hartnoll, Timothy J. Hollowood +1
We study the large N saddle points of weakly coupled N=4 super Yang-Mills theory on S^1 x S^3 that are described by a commuting matrix model for the seven scalar fields {A_0, Φ_J}.…