303 citations · 665 across the 14 of their papers we have counts for
7 papers · 1 filter
A Toy Model For Single Field Open Inflation
Pascal M. Vaudrevange, Alexander Westphal
Inflation in an open universe produced by Coleman-De Luccia (CDL) tunneling induces a friction term that is strong enough to allow for successful small-field inflation in models th…
Validity of the kink approximation to the tunneling action
Koushik Dutta, Cecelie Hector, Thomas Konstandin +2
Coleman tunneling in a general scalar potential with two non-degenerate minima is known to have an approximation in terms of a piecewise linear triangular-shaped potential with sha…
More Exact Tunneling Solutions in Scalar Field Theory
Koushik Dutta, Cecelie Hector, Pascal M. Vaudrevange +1
We present exact bounce solutions and amplitudes for tunneling in i) a piecewise linear-quartic potential and ii) a piecewise quartic-quartic potential. We cross check their correc…
The Overshoot Problem in Inflation after Tunneling
Koushik Dutta, Pascal M. Vaudrevange, Alexander Westphal
We show the absence of the usual parametrically large overshoot problem of small-field inflation if initiated by a Coleman-De Luccia (CDL) tunneling transition from an earlier vacu…
An Exact Tunneling Solution in a Simple Realistic Landscape
Koushik Dutta, Pascal M. Vaudrevange, Alexander Westphal
We present an analytical solution for the tunneling process in a piecewise linear and quadratic potential which does not make use of the thin-wall approximation. A quadratic potent…
Trans-Planckian Issue in the Milne Universe
Pascal M. Vaudrevange, Lev Kofman
The ``trans-Planckian'' challenge in cosmology appears when we trace the present physical wavelengths of fluctuations backwards in time. They become smaller and smaller until cross…