Some Observable Effects of Modified Gravity in Cosmology and Astrophysics
Abstract
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 Chapters essentially contain the published papers with some modifications and additions: in Chapter 2 I study the radiation-dominated epoch in gravity, gravitational particle production and its implications for the early and contemporary universe; in Chapter 3 I investigate the formation of curvature singularities in contracting astronomical systems; in Chapter 4, I discuss some mechanisms to prevent such singularities and calculate the related cosmic-ray production; finally, in Chapter 5, I deal with spherically symmetric solutions and explore the possibility of gravitational repulsion.
Keywords
Cite
@article{arxiv.1406.6943,
title = {Some Observable Effects of Modified Gravity in Cosmology and Astrophysics},
author = {Lorenzo Reverberi},
journal= {arXiv preprint arXiv:1406.6943},
year = {2014}
}
Comments
Doctoral thesis successfully defended in March 2014, grade: Excellent. Advisor: Prof. A.D. Dolgov. Part of the work done in collaboration with E.V. Arbuzova.