87 citations · 380 across the 19 of their papers we have counts for
19 papers
Preheating - cosmic magnetic dynamo ?
Bruce A. Bassett, Giuseppe Pollifrone, Shinji Tsujikawa +1
We study the amplification of large-scale magnetic fields during preheating and inflation in several different models. Preheating can resonantly amplify seed fields on cosmological…
Lorenz Gauge in Quantum Cosmology
Giampiero Esposito, Giuseppe Pollifrone
In a path-integral approach to quantum cosmology, the Lorenz gauge-averaging term is studied for Euclidean Maxwell theory on a portion of flat four-space bounded by two concentric…
Pre-Big Bang Cosmology and Quantum Fluctuations
A. Ghosh, G. Pollifrone, G. Veneziano
The quantum fluctuations of a homogeneous, isotropic, open pre-big bang model are discussed. By solving exactly the equations for tensor and scalar perturbations we find that parti…
Quantum Fluctuations in Open Pre-Big Bang Cosmology
A. Ghosh, G. Pollifrone, G. Veneziano
We solve exactly the (linear order) equations for tensor and scalar perturbations over the homogeneous, isotropic, open pre-big bang model recently discussed by several authors. We…
Entropy and Topology for Gravitational Instantons
Stefano Liberati, Giuseppe Pollifrone
In this work a relation between topology and thermodynamical features of gravitational instantons is shown. The expression for the Euler characteristic, through the Gauss-Bonnet in…
Noncovariant Gauges in Simple Supergravity
Giampiero Esposito, Giuseppe Pollifrone
A gauge-averaging functional of the axial type is studied for simple supergravity at one loop about flat Euclidean four-space bounded by a three-sphere, or two concentric three-sph…