197 citations · 1.4k across the 36 of their papers we have counts for
38 papers
Fifty years of cosmological particle creation
Leonard Parker, Jose Navarro-Salas
In the early sixties Leonard Parker discovered that the expansion of the universe can create particles out of the vacuum, opening a new and fruitfull field in physics. We give a hi…
Creation of quantized particles, gravitons and scalar perturbations by the expanding universe
Leonard Parker
Quantum creation processes during the very rapid early expansion of the universe are believed to give rise to temperature anisotropies and polarization patterns in the CMB radiatio…
Particle creation and particle number in an expanding universe
Leonard Parker
I describe the logical basis of the method that I developed in 1962 and 1963 to define a quantum operator corresponding to the observable particle number of a quantized free scalar…
Enhanced local-type inflationary trispectrum from a non-vacuum initial state
Ivan Agullo, Jose Navarro-Salas, Leonard Parker
We compute the primordial trispectrum for curvature perturbations produced during cosmic inflation in models with standard kinetic terms, when the initial quantum state is not nece…
Remarks on the renormalization of primordial cosmological perturbations
Ivan Agullo, Jose Navarro-Salas, Gonzalo J. Olmo +1
We briefly review the need to perform renormalization of inflationary perturbations to properly work out the physical power spectra. We also summarize the basis of (momentum-space)…
Stimulated creation of quanta during inflation and the observable universe
Ivan Agullo, Leonard Parker
Inflation provides a natural mechanism to account for the origin of cosmic structures. The generation of primordial inhomogeneities during inflation can be understood via the spont…