Unified superfluid dark sector

Ferreira, Elisa G.M.; Franzmann, Guilherme; Khoury, Justin; Brandenberger, Robert

doi:10.1088/1475-7516/2019/08/027

Title: Unified superfluid dark sector

Journal Article · Tue Aug 20 00:00:00 EDT 2019 · Journal of Cosmology and Astroparticle Physics

DOI:https://doi.org/10.1088/1475-7516/2019/08/027· OSTI ID:1612004

Ferreira, Elisa G.M. ^[1]; Franzmann, Guilherme ^[2]; Khoury, Justin ^[3]; Brandenberger, Robert ^[2]

McGill Univ., Montreal, QC (Canada); Max Planck Institute for Astrophysics, Garching (Germany)
McGill Univ., Montreal, QC (Canada)
Univ. of Pennsylvania, Philadelphia, PA (United States)

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 small throughout the evolution. We calculate the expansion history and growth of linear perturbations, and compare the results to ΛCDM cosmology. For the fiducial parameters studied here, the predicted expansion and growth function are close to those of ΛCDM, but the difference in the predicted growth rate is significant at late times. The present theory nicely complements the recent proposal of dark matter superfluidity to explain the empirical success of MOdified Newtonian Dynamics (MOND) on galactic scales, thus offering a unified framework for dark matter, dark energy, and MOND phenomenology.

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Research Organization:: Univ. of Pennsylvania, Philadelphia, PA (United States)

Sponsoring Organization:: USDOE Office of Science (SC)

Grant/Contract Number:: SC0013528

OSTI ID:: 1612004

Journal Information:: Journal of Cosmology and Astroparticle Physics, Vol. 2019, Issue 08; ISSN 1475-7516

Publisher:: Institute of Physics (IOP)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 30 works

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79 ASTRONOMY AND ASTROPHYSICS
astronomy & astrophysics
physics
dark energy theory
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Title: Unified superfluid dark sector

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