Interacting dark energy from redshift-space galaxy clustering
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Date
2021
Authors
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Publisher
IOP Publishing
Abstract
Interacting dark energy models have been proposed as attractive alternatives
to CDM. Forthcoming Stage-IV galaxy clustering surveys will constrain these models, but
they require accurate modelling of the galaxy power spectrum multipoles on mildly non-linear
scales. In this work we consider a dark scattering model with a simple 1-parameter extension
to wCDM – adding only A, which describes a pure momentum exchange between dark energy
and dark matter. We then provide a comprehensive comparison of three approaches of
modeling non-linearities, while including the effects of this dark sector coupling. We base our
modeling of non-linearities on the two most popular perturbation theory approaches: TNS
and EFTofLSS. To test the validity and precision of the modelling, we perform an MCMC
analysis using simulated data corresponding to a CDM fiducial cosmology and Stage-IV
surveys specifications in two redshift bins, z = 0:5 and z = 1. We find the most complex
EFTofLSS-based model studied to be better suited at both, describing the mock data up to
smaller scales, and extracting the most information. Using this model, we forecast uncertainties
on the dark energy equation of state, w, and on the interaction parameter, A, finding
w = 0:06 and A = 1:1 b/GeV for the analysis at z = 0:5 and w = 0:06 and A = 2:0
b/GeV for the analysis at z = 1. In addition, we show that a false detection of exotic dark
energy up to 3 would occur should the non-linear modelling be incorrect, demonstrating the
importance of the validation stage for accurate interpretation of measurements.
Description
Keywords
Interacting, dark energy, redshift-space, galaxy clustering
Citation
Carrilho, Pedro et al. “Interacting Dark Energy from Redshift-Space Galaxy Clustering.” arXiv.org (2021): n. pag. Web.