Reconstruction of the bubble nucleating potential (2009)
Luca Amendola, Carlo Baccigalupi, Rostislav Konoplich, Franco Occhionero, Sergei Rubin
We calculate analytically the bubble nucleation rate in a model of rst order in ation which is able to produce large scale structure. The computation includes the rst-order departure from the...
The Stochastic Gravitational Background From Inflationary Phase Transitions (2007)
Carlo Baccigalupi, Luca Amendola, Pierluigi Fortini, Franco Occhionero
We consider true vacuum bubbles generated in a first order phase transition occurring during the slow rolling era of a two field inflation: it is known that gravitational waves are produced by the...
Giovi, Fabio, Occhionero, Franco, Amendola, Luca
We calculate analytically and numerically the Dyer-Roeder distance in perfect fluid quintessence models and give an accurate fit to the numerical solutions for all the values of the density parameter...
Time variability of the gravitational constant and Type Ia supernovae (1999)
Amendola, Luca, Corasaniti, Stefano, Occhionero, Franco
We investigate to which extent a time variation of the gravitational constant or other fundamental constants affects the best fit of the Hubble diagram of type Ia supernovae. In particular, we show...
Stochastic gravitational background from inflationary phase transitions (1997)
Baccigalupi, Carlo, Amendola, Luca, Fortini, Pierluigi, Occhionero, Franco
We consider true vacuum bubbles generated in a first order phase transition occurring during the slow rolling era of a two field inflation: it is known that gravitational waves are produced by the...
Reconstruction of the bubble nucleating potential (1996)
Amendola, Luca, Baccigalupi, Carlo, Konoplich, Rostislav, Occhionero, Franco, Rubin, Sergei
We calculate analytically the bubble nucleation rate in a model of first order inflation which is able to produce large scale structure. The computation includes the first-order departure from the...
Reconciling inflation with openness (1996)
Amendola, Luca, Baccigalupi, Carlo, Occhionero, Franco
It is already understood that the increasing observational evidence for an open Universe can be reconciled with inflation if our horizon is contained inside one single huge bubble nucleated during...
Graviton Spectra in String Cosmology (1996)
Galluccio, Massimo, Litterio, Marco, Occhionero, Franco
We propose to uncover the signature of a stringy era in the primordial Universe by searching for a prominent peak in the relic graviton spectrum. This feature, which in our specific model terminates...
Inflation in Multidimensional Quantum Cosmology (1995)
Carugno, Enrico, Litterio, Marco, Occhionero, Franco, Pollifrone, Giuseppe
We extend to multidimensional cosmology Vilenkin's prescription of tunnelling from nothing for the quantum origin of the observable Universe. Our model consists of a $D+4$-dimensional spacetime of...
Reconciling Inflation with Openness (1995)
Amendola, Luca, Baccigalupi, Carlo, Occhionero, Franco
It is already understood that the increasing observational evidence for an open Universe may be reconciled with inflation if our horizon is contained inside one single huge bubble nucleated during...
String Cosmology and Inflation (1995)
Angelantonj, Carlo, Amendola, Luca, Litterio, Marco, Occhionero, Franco
Following a suggestion by Gasperini and Veneziano, that String Cosmology can be reconciled with Inflation and, hence, with the Standard Big Bang, we display an analytical solution which possesses...
Inflationary Attractors and Perturbation Spectra in Generally Coupled Gravity (1993)
Amendola, Luca, Bellisai, Diego, Occhionero, Franco, Observatory, Rome Astronomical
A generic outcome of theories with scalar-tensor coupling is the existence of inflationary attractors, either power-law or de Sitter. The fluctuations arising during this phase are Gaussian and their...
Stability of Compactiflcation During Inflation FERMILAB-Pub-90/47-A (1990)
Luca Amendola, Edward W. Kolb, Marco Litterio, Franco Occhionero
The possibility that inflation may trigger an instability in compactification of extra spatial dimensions is considered. In old, new, or extended inflation, the false vacuum energy results in a...