398 citations · 1.4k across the 9 of their papers we have counts for
9 papers
Spectra of primordial fluctuations in two-perfect-fluid regular bounces
F. Finelli, P. Peter, N. Pinto-Neto
We introduce analytic solutions for a class of two components bouncing models, where the bounce is triggered by a negative energy density perfect fluid. The equation of state of th…
Adiabatic and Isocurvature Perturbations for Multifield Generalized Einstein Models
Fabrizio Di Marco, Fabio Finelli, Robert Brandenberger
Low energy effective field theories motivated by string theory will likely contain several scalar moduli fields which will be relevant to early Universe cosmology. Some of these fi…
On the Construction of Nonsingular Pre-Big-Bang and Ekpyrotic Cosmologies and the Resulting Density Perturbations
Shinji Tsujikawa, Robert Brandenberger, Fabio Finelli
We consider the construction of nonsingular Pre-Big-Bang and Ekpyrotic type cosmological models realized by the addition to the action of specific higher-order terms stemming from…
On the Generation of a Scale-Invariant Spectrum of Adiabatic Fluctuations in Cosmological Models with a Contracting Phase
Fabio Finelli, Robert Brandenberger
In Pre-Big-Bang and in Ekpyrotic Cosmology, perturbations on cosmological scales today are generated from quantum vacuum fluctuations during a phase when the Universe is contractin…
On the Spectrum of Fluctuations in an Effective Field Theory of the Ekpyrotic Universe
R. Brandenberger, F. Finelli
We consider the four-dimensional effective field theory which has been used in previous studies of perturbations in the Ekpyrotic Universe, and discuss the spectrum of cosmological…
Metric perturbations at reheating: the use of spherical symmetry
F. Finelli, S. Khlebnikov
We consider decay of the inflaton with a quartic potential coupled to other fields, including gravity, but restricted to spherical symmetry. We describe analytically an early, quas…