30 citations · 49 across the 6 of their papers we have counts for
8 papers
Gauge-invariant Effective Action for the Dynamics of Bose-Einstein condensates with a fixed number of atoms
Esteban Calzetta, Bei-Lok Hu
In this paper we present a particle-number-conserving (PNC) functional formalism to describe the dynamics of a cold bosonic gas. Treating the total number of particles as a constra…
Macroscopic quantum tunneling with decoherence
Esteban Calzetta, Enric Verdaguer
The tunneling probability for a system modelling macroscopic quantum tunneling is computed. We consider an open quantum system with one degree of freedom consisting of a particle t…
Macroscopic description of preheating
Esteban Calzetta, Marc Thibeault
We present a macroscopic model of the decay of a coherent classical scalar field into statistical fluctuations through the process of parametric amplification. We solve the field t…
Activation-like processes at zero temperature
Daniel Arteaga, Esteban Calzetta, Albert Roura +1
We examine the possibility that a metastable quantum state could experiment a phenomenon similar to thermal activation but at zero temperature. In order to do that we study the rea…
BEC Collapse, Particle Production and Squeezing of the Vacuum
Esteban Calzetta, Bei Lok Hu
Phenomena associated with the controlled collapse of a Bose-Einstein condensate described in the experiment of Donley et al (E. Donley et. al., Nature 412, 295 (2001); N. Claussen,…
Thermalization of an Interacting Quantum Field in the CTP-2PI Next-to-leading-order Large N Scheme
E. Calzetta, B. L. Hu
In this paper we use an O(N)-invariant scalar field of unbroken symmetry to investigate whether an interacting quantum field at the next-to-leading order Large approximation ma…