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

Vinicius Miranda, Mariana Carrillo González, Elisabeth Krause, Mark Trodden

Research output: Contribution to journalArticlepeer-review

9 Scopus citations

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) are capable of probing the dark sector coupling to the few percent level for a given class of models, using only linear and quasilinear Fourier modes. These scales can, in principle, be described by semianalytical techniques such as the effective field theory of large-scale structure.

Original languageEnglish (US)
Article number063511
JournalPhysical Review D
Volume97
Issue number6
DOIs
StatePublished - Mar 15 2018
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

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