279 citations · 488 across the 13 of their papers we have counts for
13 papers
Cosmic Energy Density: Particles, Fields and the Vacuum
Cristian Armendariz-Picon, Alberto Diez-Tejedor
We revisit the cosmic evolution of the energy density of a quantized free scalar field and assess under what conditions the particle production and classical field approximations r…
On the Expected Backreaction During Preheating
C. Armendariz-Picon
In previous work we argued that the correct procedure to predict the gravitational wave signal from preheating after inflation rests on the in-in formalism. We extend here our prev…
On the Expected Production of Gravitational Waves During Preheating
C. Armendariz-Picon
The existing predictions of the energy density of gravitational waves produced during preheating mostly rely on computer simulations in which the matter field inhomogeneities essen…
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…
How Cold is Cold Dark Matter?
Cristian Armendariz-Picon, Jayanth T. Neelakanta
If cold dark matter consists of particles, these must be non-interacting and non-relativistic by definition. In most cold dark matter models however, dark matter particles inherit…