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On cosmological signatures of baryons-dark energy elastic couplings
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On cosmological signatures of baryons-dark energy elastic couplings
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We consider a scenario where dark energy and baryons are dynamically coupled without any energy transfer. In this scenario, the background cosmology is unaffected and, at the perturbations level, the coupling only appears through the corresponding Euler equations of dark energy and baryons. We then explore some phenomenological consequences of this scenario and their signatures in several cosmological observables. In particular, we show its ability to suppress the growth of cosmic structures. We also constrain the parameters of the model with cosmological data and show that an interaction of dark energy with baryons on cosmological scales is mildly favoured.
Forward citations
Cited by 3 Pith papers
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All vanishing-speed-of-sound TDiff scalar theories reduce to a two-parameter mimetic action describing the dark sector as interacting dust plus vacuum; a quadratic-potential example tracks the DESI CPL background.
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Dark matter-baryons elastic coupling
A new dark-matter–baryon momentum-transfer interaction suppresses small-scale clustering and is mildly preferred by data when a low-redshift S8 measurement is included.
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