103 citations · 103 across the 1 of their papers we have counts for
4 papers
Perturbations in a non-singular bouncing Universe
M. Gasperini, M. Giovannini, G. Veneziano
We complement the low-energy gravi-dilaton effective action of string theory with a non-local, general-covariant dilaton potential, and obtain homogeneous solutions describing a no…
Normal modes for metric fluctuations in a class of higher-dimensional backgrounds
M. Gasperini, M. Giovannini
We discuss a gauge invariant approach to the theory of cosmological perturbations in a higher-dimensonal background. We find the normal modes which diagonalize the perturbed action…
Relic Gravitational Waves from String Cosmology
R. Brustein, M. Gasperini, M. Giovannini +1
A large class of string-cosmology backgrounds leads to a spectrum of relic stochastic gravitational waves, strongly tilted towards high frequencies, and characterized by two basic…
VON NEUMANN AND SHANNON-WEHRL ENTROPY FOR SQUEEZED STATES AND COSMOLOGICAL PARTICLE PRODUCTION
M. Gasperini, M. Giovannini
We show that the effective coarse graining of a two-mode squeezed density matrix, implicit in the Wehrl approaches to a semiclassical phase-space distribution, leads to results in…