534 citations · 3.1k across the 77 of their papers we have counts for
4 papers · 1 filter
The cosmological vacuum ambiguity, effective actions, and transplanckian effects in inflation
Koenraad Schalm, Gary Shiu, Jan Pieter van der Schaar
We provide a prescription for parametrizing the vacuum choice ambiguity in cosmological settings. We introduce an arbitrary boundary action representing the initial conditions. A L…
Decoupling in an expanding universe: backreaction barely constrains short distance effects in the CMB
Brian R. Greene, Koenraad Schalm, Gary Shiu +1
We clarify the status of transplanckian effects on the cosmic microwave background (CMB) anisotropy. We do so using the boundary effective action formalism of hep-th/0401164 which…
Tuning Locked Inflation: Supergravity versus Phenomenology
Richard Easther, Justin Khoury, Koenraad Schalm
We analyze the cosmological consequences of locked inflation, a model recently proposed by Dvali and Kachru that can produce significant amounts of inflation without requiring slow…
Decoupling in an expanding universe: boundary RG-flow affects initial conditions for inflation
Koenraad Schalm, Gary Shiu, Jan Pieter van der Schaar
We study decoupling in FRW spacetimes, emphasizing a Lagrangian description throughout. To account for the vacuum choice ambiguity in cosmological settings, we introduce an arbitra…