Unified Superfluid Dark Sector
Elisa G. M. Ferreira, Guilherme Franzmann, Justin Khoury, Robert, Brandenberger

TL;DR
This paper proposes a unified dark sector model where dark matter superfluid interactions naturally produce late-time cosmic acceleration, potentially explaining dark energy and MOND phenomenology within a single framework.
Contribution
It introduces a two-state dark matter superfluid with Josephson-like interactions that generate cosmic acceleration without dark energy, aligning with $ ext{Λ}$CDM predictions.
Findings
Expansion history closely matches $ ext{Λ}$CDM.
Growth rate differs significantly at late times.
Model naturally incorporates MOND phenomenology.
Abstract
We present a novel theory of a unified dark sector, where late-time cosmic acceleration emerges from the dark matter superfluid framework. The system is described by a superfluid mixture consisting of two distinguishable states with a small energy gap, such as the ground state and an excited state of dark matter. Given their contact in the superfluid, interaction between those states can happen, converting one state into the other. This long range interaction within the superfluid couples the two superfluid phonon species through a cosine potential motivated by Josephson/Rabi interactions. As a consequence of this potential, a new dynamics of late-time accelerated expansion emerges in this system, without the need of dark energy, coming from a universe containing only this two-state DM superfluid. Because the superfluid species are non-relativistic, their sound speeds remain suitably…
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