New effective theories of gravitation and their phenomenological consequences

This thesis focuses on modifications on Einstein's theory of General Relativity, which could explain the current problems in gravitation and cosmology. More specifically, modifications of the affine structure of the spacetime, which is the structure that tells us how to perform derivatives, are...

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Bibliographic Details
Published in:arXiv.org 2021-01
Main Author: Maldonado Torralba, Francisco José
Format: Article
Language:English
Subjects:
Black holes
Cosmology
Fermions
Gravitation
Relativity
Singularities
Online Access:Get full text
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Summary:This thesis focuses on modifications on Einstein's theory of General Relativity, which could explain the current problems in gravitation and cosmology. More specifically, modifications of the affine structure of the spacetime, which is the structure that tells us how to perform derivatives, are studied. These theories appear when imposing that the system must be invariant under the action of the local Poincaré group. Within these theories, their stability, the conditions for the appearance of singularities, the movement of fermions, and if it is possible to find different Black Hole solutions than in Einstein's theory, is explored. Moreover, a non-local extension of the mentioned modification is proposed, which can make the theory free of instabilities and singularities at the linear limit.
ISSN:2331-8422
DOI:10.48550/arxiv.2101.11523