Nonlinear evolution of initially biased tracers in modified gravity
| Autor: | Aviles, Alejandro, Rodriguez-Meza, Mario Alberto, De-Santiago, Josue, Cervantes-Cota, Jorge L. |
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| Rok vydání: | 2018 |
| Předmět: | |
| Zdroj: | JCAP 11 (2018) 013 |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1088/1475-7516/2018/11/013 |
| Popis: | In this work we extend the perturbation theory for modified gravity (MG) in two main aspects. First, the construction of matter overdensities from Lagrangian displacement fields is shown to hold in a general framework, allowing us to find Standard Perturbation Theory (SPT) kernels from known Lagrangian Perturbation Theory (LPT) kernels. We then develop a theory of biased tracers for generalized cosmologies, extending already existing formalisms for $\Lambda$CDM. We present the correlation function in Convolution-LPT and the power spectrum in SPT for $\Lambda$CDM, $f(R)$ Hu-Sawicky, and DGP braneworld models. Our formalism can be applied to many generalized cosmologies and to facilitate it, we are making public a code to compute these statistics. We further study the relaxation of bias with the use of a simple model and of excursion set theory, showing that in general the bias parameters have smaller values in MG than in General Relativity. Comment: 38 pages, 8 figures. v2: matches the published version |
| Databáze: | arXiv |
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