477 citations · 1.5k across the 32 of their papers we have counts for
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hep-th2020
Manifestly Causal In-In Perturbation Theory about the Interacting Vacuum
Matthew Baumgart, Raman Sundrum
In-In perturbation theory is a vital tool for cosmology and nonequilibrium physics. Here, we reconcile an apparent conflict between two of its important aspects with particular rel…
hep-th2019★ 75 cited
De Sitter Diagrammar and the Resummation of Time
Matthew Baumgart, Raman Sundrum
Light scalars in inflationary spacetimes suffer from logarithmic infrared divergences at every order in perturbation theory. This corresponds to the scalar field values in differen…