Nonlinear evolution of initially biased tracers in modified gravity
| Autor: | Mario A. Rodriguez-Meza, Josue De-Santiago, Jorge L. Cervantes-Cota, Alejandro Aviles |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
Physics
Cosmology and Nongalactic Astrophysics (astro-ph.CO) 010308 nuclear & particles physics General relativity Excursion FOS: Physical sciences Spectral density Astronomy and Astrophysics General Relativity and Quantum Cosmology (gr-qc) Astrophysics::Cosmology and Extragalactic Astrophysics 01 natural sciences Rotation formalisms in three dimensions General Relativity and Quantum Cosmology Formalism (philosophy of mathematics) symbols.namesake 0103 physical sciences symbols Statistical physics Nonlinear evolution 010303 astronomy & astrophysics Lagrangian Astrophysics - Cosmology and Nongalactic Astrophysics |
| Zdroj: | Journal of Cosmology and Astroparticle Physics. 2018:013-013 |
| ISSN: | 1475-7516 |
| 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: | OpenAIRE |
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