89 citations · 367 across the 13 of their papers we have counts for
13 papers
Gravitational reheating and superheavy Dark Matter creation after inflation with non-minimal coupling
E. Babichev, D. Gorbunov, S. Ramazanov +1
We discuss the gravitational creation of superheavy particles in an inflationary scenario with a quartic potential and a non-minimal coupling between the inflaton and the R…
Relativistic Cosmological Simulations in Gravity I: Methodology
Lorenzo Reverberi, David Daverio
We present the new relativistic cosmological particle-mesh code , based on , aimed at simulating non-linear structure formation in …
Cosmic ray production in modified gravity
Elena V. Arbuzova, Alexander D. Dolgov, Lorenzo Reverberi
This paper is a reply to the criticism of our work on particle production in modified gravity by D. Gorbunov and A. Tokareva. We show that their arguments against efficient particl…
Model-independent limits and constraints on extended theories of gravity from cosmic reconstruction techniques
Álvaro de la Cruz-Dombriz, Peter K. S. Dunsby, Orlando Luongo +1
The onset of dark energy domination depends on the particular gravitational theory driving the cosmic evolution. Model independent techniques are crucial to test both the present $…
Dark Energy and Dark Matter from an additional adiabatic fluid
Peter K. S. Dunsby, Orlando Luongo, Lorenzo Reverberi
The Dark Sector is described by an additional barotropic fluid which evolves adiabatically during the universe's history and whose adiabatic exponent is derived from the standa…
Gravitational instability in oscillating background
E. V. Arbuzova, A. D. Dolgov, L. Reverberi
Evolution of density and metric perturbations in the background of high frequency oscillations of curvature in F(R) gravity is considered. In addition to the usual Jeans-like insta…
Some Observable Effects of Modified Gravity in Cosmology and Astrophysics
Lorenzo Reverberi
In Chapter 1 I present the current picture of the universe and briefly review the cosmological constant problem and some of the theories proposed to solve it. The following Chapter…
Jeans Instability in Classical and Modified Gravity
E. V. Arbuzova, A. D. Dolgov, L. Reverberi
Gravitational instability in classical Jeans theory, General Relativity, and modified gravity is considered. The background density increase leads to a faster growth of perturbatio…
Spherically Symmetric Solutions in F(R) Gravity and Gravitational Repulsion
E. V. Arbuzova, A. D. Dolgov, L. Reverberi
Spherically symmetric solutions in F(R) theories in astronomical systems with rising energy density are studied. The range of parameters is established for which the flat space-tim…
Particle Production in f(R) Gravity during Structure Formation
E. V. Arbuzova, A. D. Dolgov, L. Reverberi
We study particle production in infrared-modified gravitational theories in the contemporary universe. It is shown that in astronomical systems with rising mass density, the curvat…
Curvature Singularities from Gravitational Contraction in f(R) Gravity
Lorenzo Reverberi
The discovery of the accelerated expansion of the Universe has had a vast resonance on a number of physical disciplines. In recent years several viable modified gravity models have…
Curvature Oscillations in Modified Gravity and High Energy Cosmic Rays
E. V. Arbuzova, A. D. Dolgov, L. Reverberi
It is shown that F(R)-modified gravitational theories lead to curvature oscillations in astrophysical systems with rising energy density. The frequency and the amplitude of such os…
Cosmological evolution in R^2 gravity
E. V. Arbuzova, A. D. Dolgov, L. Reverberi
The Universe evolution during the radiation-dominated epoch in the R^2-extended gravity theory is considered. The equations of motion for R and H are solved analytically and numeri…