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7 papers · 2 filters
Vacuum polarization around stars: nonlocal approximation
Alejandro Satz, Francisco D. Mazzitelli, Ezequiel Alvarez
We compute the vacuum polarization associated with quantum massless fields around stars with spherical symmetry. The nonlocal contribution to the vacuum polarization is dominant in…
On the Weyl transverse frames in type I spacetimes
Joan Josep Ferrando, Juan Antonio Sáez
We apply a covariant and generic procedure to obtain explicit expressions of the transverse frames that a type I spacetime admits in terms of an arbitrary initial frame. We also pr…
Local thermal equilibrium and ideal gas Stephani universes
Bartolomé Coll, Joan Josep Ferrando
The Stephani universes that can be interpreted as an ideal gas evolving in local thermal equilibrium are determined. Five classes of thermodynamic schemes are admissible, which giv…
Quantum effects in Acoustic Black Holes: the Backreaction
R. Balbinot, S. Fagnocchi, A. Fabbri
We investigate the backreaction equations for an acoustic black hole formed in a Laval nozzle under the assumption that the motion of the fluid is one-dimensional. The solution in…
Backreaction in Acoustic Black Holes
Roberto Balbinot, Serena Fagnocchi, Alessandro Fabbri +1
The backreaction equations for the linearized quantum fluctuations in an acoustic black hole are given. The solution near the horizon, obtained within a dimensional reduction, indi…
Accretion-driven gravitational radiation from nonrotating compact objects. Infalling quadrupolar shells
Alessandro Nagar, Guillermo Diaz, Jose A. Pons +1
This paper reports results from numerical simulations of the gravitational radiation emitted from non--rotating compact objects(both neutron stars and Schwarzschild black holes) as…