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- W2217085810 abstract "Gravity could be modified compared to General Relativity on very large scales, assuggested by the discovery of the accelerated expansion of the Universe. One possibleexplanation would be the existence, on cosmological scales, of scalar fields, whichhave hidden their presence until now thanks to particular screening mechanisms andwhich would infuence the growth of large scale structures by their coupling to ColdDark Matter.Since a complete analysis of the structure formation problem would require completeN-body simulations, which are really complex from a computational point of view,the goal of this thesis is to find a set of semi-analytical approximations that allowsto obtain reliable results.First of all we will investigate the spherical collapse of such structures, in order tounderstand how this new scale-dependent fifth force, mediated by the scalar field,changes the critical initial overdensity necessary to collapse and also how differentmodels modify this value.In a second step, we will use the excursion set theory to relate the statistics ofthe density field at early times to the number of virialized, gravitationally boundstructures. Since the fifth force is stronger for smaller objects, a smaller initialoverdensity is required to collapse and we expect to find a larger number of haloeswith respect to General Relativity." @default.
- W2217085810 created "2016-06-24" @default.
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- W2217085810 date "2015-10-01" @default.
- W2217085810 modified "2023-10-17" @default.
- W2217085810 title "Application of the excursion set theory to modified gravity" @default.
- W2217085810 hasPublicationYear "2015" @default.
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