Author:
Rubira Henrique,Mazoun Asmaa,Garny Mathias
Abstract
Abstract
In this work we derive constraints on interacting dark matter-dark radiation models from a full-shape analysis of BOSS-DR12 galaxy clustering data, combined with Planck legacy cosmic microwave background (CMB) and baryon acoustic oscillation (BAO) measurements. We consider a set of models parameterized within the effective theory of structure formation (ETHOS), quantifying the
lifting of the S8
tension in view of KiDS weak-lensing results. The most favorable scenarios point to a fraction f ∼ 10-100% of interacting dark matter as well as a dark radiation temperature that is smaller by a factor ξ ∼ 0.1-0.15 compared to the CMB, leading to a reduction of the tension to the ∼ 1σ level.
The temperature dependence of the interaction rate favored by relaxing the S8
tension is realized for a weakly coupled unbroken non-Abelian SU(N) gauge interaction in the dark sector.
To map our results onto this SU(N) model, we compute higher-order corrections due to Debye screening. We find
a lower bound αd
≡ gd
2/(4π) ≳ 10-8 (10-9) for dark matter mass 1000 (1) GeV for relaxing the S8
tension, consistent with upper bounds from galaxy ellipticities and compatible with self-interactions relevant for small-scale structure formation.
Subject
Astronomy and Astrophysics
Cited by
8 articles.
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