Finding structure in the dark: coupled dark energy, weak lensing, and the mildly nonlinear regime

Abstract

We reexamine interactions between the dark sectors of cosmology, with a focus on robust constraints that can be obtained using only mildly nonlinear scales. While it is well known that couplings between dark matter and dark energy can be constrained to the percent level when including the full range of scales probed by future optical surveys, calibrating matter power spectrum emulators to all possible choices of potentials and couplings requires many computationally expensive n-body simulations. Here we show that lensing and clustering of galaxies in combination with the Cosmic Microwave Background (CMB) is capable of probing the dark sector coupling to the few percent level for a given class of models, using only linear and quasi-linear Fourier modes. These scales can, in principle, be described by semi-analytical techniques such as the effective field theory of large-scale structure.

35 pages, 9 figures

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Cited by in corpus (9)

• Hubble Sinks In The Low-Redshift Swampland
• $H_0$ Tension, Swampland Conjectures and the Epoch of Fading Dark Matter
• Remedy of some cosmological tensions via effective phantom-like behavior of interacting vacuum energy
• Cosmological constraints on an exponential interaction in the dark sector
• Constraining interacting dark energy with CMB and BAO future surveys
• Dark Energy, the Swampland and the Equivalence Principle
• The Swampland and Screened Modified Gravity
• Dark matter relic density from conformally or disformally coupled light scalars
• Phantom Dirac-Born-Infeld Dark Energy