279 citations · 488 across the 13 of their papers we have counts for
3 papers · 1 filter
When Does the Inflaton Decay?
C. Armendariz-Picon
In order for the inflaton to decay into radiation at the end of inflation, it needs to couple to light matter fields. In this article we determine whether such couplings cause the…
BRST Quantization of Cosmological Perturbations
Cristian Armendariz-Picon, Gizem Şengör
BRST quantization is an elegant and powerful method to quantize theories with local symmetries. In this article we study the Hamiltonian BRST quantization of cosmological perturbat…
Where does Cosmological Perturbation Theory Break Down?
Cristian Armendariz-Picon, Michele Fontanini, Riccardo Penco +1
We apply the effective field theory approach to the coupled metric-inflaton system, in order to investigate the impact of higher dimension operators on the spectrum of scalar and t…