Gravitational redshift constraints on the effective theory of interacting dark energy

Upcoming galaxy surveys provide the necessary sensitivity to measure gravitational redshift, a general relativistic effect that generates a dipole in galaxy clustering data when correlating two distinct populations of galaxies. Here, we study the constraining power of gravitational redshift within t...

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Bibliographic Details
Published in:Journal of cosmology and astroparticle physics 2024-05, Vol.2024 (5), p.3
Main Authors: Castello, Sveva, Mancarella, Michele, Grimm, Nastassia, Sobral-Blanco, Daniel, Tutusaus, Isaac, Bonvin, Camille
Format: Article
Language:English
Subjects:
Clustering
Correlation
Dark energy
dark energy theory
Dark matter
Dipoles
Equivalence principle
Field theory
Galaxies
galaxy clustering
galaxy surveys
Multipoles
Neutrons
Populations
Red shift
redshift surveys
Relativistic effects
Tensors
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Summary:Upcoming galaxy surveys provide the necessary sensitivity to measure gravitational redshift, a general relativistic effect that generates a dipole in galaxy clustering data when correlating two distinct populations of galaxies. Here, we study the constraining power of gravitational redshift within the framework of the effective theory of interacting dark energy. This formalism describes linear cosmological perturbations in scalar-tensor theories of gravity with a limited number of free functions, and allows each particle species to be coupled differently to the gravitational sector. In this work, we focus on Horndeski theories with a non-minimal coupling of dark matter to the scalar degree of freedom, yielding a breaking of the weak equivalence principle for this cosmic component, a scenario that is yet untested. We show that the dipole generated by gravitational redshift significantly breaks degeneracies and tightens the constraints on the parameters of the effective theory compared to the standard redshift-space distortion analysis solely based on the even multipoles in the galaxy correlation function, with an improvement of up to ∼ 50% for populations with a galaxy bias difference equal to 1. We make the Python package EF-TIGRE ( Effective Field Theory of Interacting dark energy with Gravitational REdshift ) developed for this work publicly available ( https://github.com/Mik3M4n/EF-TIGRE ).
ISSN:1475-7516
1475-7516
DOI:10.1088/1475-7516/2024/05/003