Non-linear power spectrum and forecasts for Generalized Cubic Covariant Galileon
arxiv(2024)
摘要
To fully exploit the data from next generation surveys, we need an accurate
modelling of the matter power spectrum up to non-linear 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 non-linear 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 non-linear 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 non-linear corrections to the matter power
spectrum beyond the linear regime is crucial to obtain this result.
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