Modified Actions for Gravity: Theory and Phenomenology

Details Modified Actions for Gravity: Theory and Phenomenology Modified Actions for Gravity: Theory and Phenomenology

2007-10-24

arxiv.org/abs/0710.4438v1

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

PhD thesis (Advisors: Stefano Liberati and John C. Miller), 230 pages

Scientific paper

This thesis is devoted to the study of gravitational theories which can be seen as modifications or generalisations of General Relativity. The motivation for considering such theories, stemming from Cosmology, High Energy Physics and Astrophysics is thoroughly discussed (cosmological problems, dark energy and dark matter problems, the lack of success so far in obtaining a successful formulation for Quantum Gravity). The basic principles which a gravitational theory should follow, and their geometrical interpretation, are analysed in a broad perspective which highlights the basic assumptions of General Relativity and suggests possible modifications which might be made. A number of such possible modifications are presented, focusing on certain specific classes of theories: scalar-tensor theories, metric f(R) theories, Palatini f(R) theories, metric-affine f(R) theories and Gauss--Bonnet theories. The characteristics of these theories are fully explored and attention is payed to issues of dynamical equivalence between them. Also, cosmological phenomenology within the realm of each of the theories is discussed and it is shown that they can potentially address the well-known cosmological problems. A number of viability criteria are presented: cosmological observations, Solar System tests, stability criteria, existence of exact solutions for common vacuum or matter configurations etc. Finally, future perspectives in the field of modified gravity are discussed and the possibility for going beyond a trial-and-error approach to modified gravity is explored.

Affiliated with

Also associated with

No associations

Rating

Modified Actions for Gravity: Theory and Phenomenology does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Modified Actions for Gravity: Theory and Phenomenology, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Modified Actions for Gravity: Theory and Phenomenology will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-655147