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Nonlinear power spectrum and forecasts for a generalized cubic covariant Galileon

Atayde, Luís; Frusciante, Noemi; Bose, Benjamin; Casas, Santiago; Li, Baojiu

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Authors

Luís Atayde

Noemi Frusciante

Benjamin Bose

Santiago Casas



Abstract

To fully exploit the data from next generation surveys, we need an accurate modeling of the matter power spectrum up to nonlinear scales. Therefore in this work we present the halo model reaction framework for the generalized cubic covariant Galileon (GCCG) model, a modified gravity model within the Horndeski class of theories which extends the cubic covariant Galileon (G3) by including power laws of the derivatives of the scalar field in the K-essence and cubic terms. We modify the publicly available software ReACT for the GCCG in order to obtain an accurate prediction of the nonlinear power spectrum. In the limit of the G3 model we compare the modified ReACT code to N-body simulations and we find agreement within 5% for a wide range of scales and redshifts. We then study the relevant effects of the modifications introduced by the GCCG on the nonlinear matter power spectrum. Finally, we provide forecasts from spectroscopic and photometric primary probes by next generation surveys using a Fisher matrix method. We show that future data will be able to constrain at 1σ the two additional parameters of the model at the percent level and that considering nonlinear corrections to the matter power spectrum beyond the linear regime is crucial to obtain this result.

Citation

Atayde, L., Frusciante, N., Bose, B., Casas, S., & Li, B. (2024). Nonlinear power spectrum and forecasts for a generalized cubic covariant Galileon. Physical Review D, 110(2), Article 024082. https://doi.org/10.1103/physrevd.110.024082

Journal Article Type Article
Acceptance Date Jun 27, 2024
Online Publication Date Jul 29, 2024
Publication Date Jul 29, 2024
Deposit Date Sep 16, 2024
Publicly Available Date Sep 16, 2024
Journal Physical Review D
Print ISSN 2470-0010
Electronic ISSN 2470-0029
Publisher American Physical Society
Peer Reviewed Peer Reviewed
Volume 110
Issue 2
Article Number 024082
DOI https://doi.org/10.1103/physrevd.110.024082
Public URL https://durham-repository.worktribe.com/output/2865106

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