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- W2774161092 abstract "In this thesis we investigate the importance of non-linear structure formation on thedetermination of cosmological parameters for models beyond the standard ΛCDMscenario. Future galaxy surveys will be able to determine the two-point correlationfunction of more than 10^7 galaxies in a very precise way. Extracting the information encoded in this function at small scales, allows us to constrain the underlyingcosmological model. Here we consider different models beyond ΛCDM: CoupledDark Energy, Growing Neutrino Quintessence, Effective Field Theory, Horndeskitheory and general phenomenological parameterizations of Modified Gravity. Tostudy the non-linear effects in these models, we use different methodologies: fitting formulae, semi-analytic prescriptions based on the Halo model, resummationmethods in cosmological perturbation theory and specialized N-body simulations.In order to forecast the constraining power of next-generation surveys, such as Euclid, SKA and DESI, we developed a code that uses the Bayesian Fisher matrix for-malism to compute the inferred error on the parameters for Galaxy Clustering andWeak Lensing observables. For Modified Gravity we study the effect that differentparameterizations and different non-linear prescriptions have on the Fisher forecasts. We obtain the best combination of redshift-binned parameters which willbe measured by future experiments. Within the Coupled Dark Energy scenariowe perform the first forecasts using fitting formulae from N-body simulations andshow that using non-linear scales improves the constraints by more than an orderof magnitude compared to linear forecasts. In the Growing Neutrino Quintessencemodel, we use non-Newtonian N-body simulations to study the different regimesfor the dynamics of neutrino lumps. We show that there are viable cosmologieswithin this model and that the lump interactions induce a heating of the neutrinofluid. Finally, we also study analytically the non-linear corrections to the powerspectrum in the case of Horndeski theory under the quasistatic approximation. Toachieve this, we apply a resummation method for higher order perturbation theory,which had so far only been employed within the standard cosmological model. Themain message of this thesis is that non-linear structure formation has a significantimpact on cosmological parameter estimation. In order to discriminate betweencompeting theories, using forthcoming data, we need to take non-linearities andtheir implications into account." @default.
- W2774161092 created "2017-12-22" @default.
- W2774161092 creator A5078936833 @default.
- W2774161092 date "2017-01-01" @default.
- W2774161092 modified "2023-09-24" @default.
- W2774161092 title "Non-linear structure formation in models of Dark Energy and Modified Gravity" @default.
- W2774161092 doi "https://doi.org/10.11588/heidok.00023120" @default.
- W2774161092 hasPublicationYear "2017" @default.
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