62 citations · 79 across the 6 of their papers we have counts for
6 papers
A simple mechanism for the enhancement of the inflationary power spectrum
I. Dalianis, A. Katsis, N. Tetradis
The background evolution in two-field inflation can feature two distinct stages, corresponding to the evolution along two successive field directions. When the second stage occurs…
The sinusoidal valley: a recipe for high peaks in the scalar and induced tensor spectra
Aris Katsis
Adding a sine-type interaction to inflationary models with two fields can evoke a classical trajectory with many turns in field space. Under conditions we discuss, the enhancement…
The dark matter bispectrum from effective viscosity and one-particle irreducible vertices
Stefan Floerchinger, Mathias Garny, Aris Katsis +2
Dark matter evolution during the process of cosmological structure formation can be described in terms of a one-particle irreducible effective action at a characteristic scale $k_m…
Multicritical points of the O(N) scalar theory in for large N
A. Katsis, N. Tetradis
We solve analytically the renormalization-group equation for the potential of the O(N)-symmetric scalar theory in the large-N limit and in dimensions 2<d<4, in order to look for no…
(Higgs) vacuum decay during inflation
Aris Joti, Aris Katsis, Dimitris Loupas +4
We develop the formalism for computing gravitational corrections to vacuum decay from de Sitter space as a sub-Planckian perturbative expansion. Non-minimal coupling to gravity can…
Quantum Corrections in Classicalon Theories
Petros Asimakis, Nikolaos Brouzakis, Aris Katsis +1
We use the heat kernel in order to compute the one-loop effective action on a classicalon background. We find that the UV divergences are suppressed relative to the predictions of…