Cosmological perturbations in massive gravity and bigravity

Diplôme Thèse Cosmological perturbations in massive gravity and bigravity eng 2016-09-07 author Guarato Pietro 790473 director Durrer Ruth 0000-0001-9833-2086 106998 10.13097/archive-ouverte/unige:96834 urn:nbn:ch:unige-968345 Sc. 4984 This Thesis focus on two recent Lorentz-invariant theories which modify General Relativity by the introduction of an additional spin-2 field interacting with the space-time metric, the massive gravity theory and the bigravity (or bimetric gravity) theory. The main scopes of this Thesis are: first, to derive the full expression of the quadratic mass term for general perturbations at the level of the action both in the ghost-free massive gravity theory (with general reference metric) and in the ghost-free bimetric theory; and secondly, to investigate some cosmological applications of the linear perturbation theory to the case of bimetric gravity in order to see whether this theory can give rise to a viable description of our Universe, according to the current observational data. Part I of the Thesis is devoted to the first scope and part II to the second one. Dewey 500.2 37 Département de physique théorique 133 false 583b5f2c-26cc-4433-ab24-6c88dc31c183 Thesis Public Guarato_Pietro.pdf 6175519 application/pdf openAccess Faculté des sciences / Section de physique / Département de physique théorique

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Guarato, Pietro