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Dark matter from a dark connection

Das, R and Krishnan, C (2021) Dark matter from a dark connection. In: Modern Physics Letters A, 36 (19).

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Official URL: https://doi.org/10.1142/S0217732321501340


In the first part of this note, we observe that a non-Riemannian piece in the affine connection (a "dark connection") leads to an algebraically determined, conserved, symmetric 2-tensor in the Einstein field equations that is a natural dark matter candidate. The only other effect it has, is through its coupling to standard model fermions via covariant derivatives. If the local dark matter density is the result of a background classical dark connection, these Yukawa-like mass corrections are minuscule (∼10-31eV for terrestrial fermions) and none of the tests of general relativity or the equivalence principle are affected. In the second part of the note, we give dynamics to the dark connection and show how it can be re-interpreted in terms of conventional dark matter particles. The simplest way to do this is to treat it as a composite field involving scalars or vectors. The (pseudo-)scalar model naturally has a perturbative shift-symmetry and leads to versions of the Fuzzy Dark Matter (FDM) scenario that has recently become popular (e.g. arXiv:1610.08297) as an alternative to WIMPs. A vector model with a 2-parity falls into the Planckian Interacting Dark Matter (PIDM) paradigm, introduced in arXiv:1511.03278. It is possible to construct versions of these theories that yield the correct relic density, fit with inflation and are falsifiable in the next round of CMB experiments. Our work is an explicit demonstration that the meaningful distinction is not between gravity modification and dark matter, but between theories with extra fields and those without.

Item Type: Journal Article
Publication: Modern Physics Letters A
Publisher: World Scientific
Additional Information: The copyright for this article belongs to the Authors.
Keywords: connection; Fuzzy dark matter; gravity modification; Planckian interacting dark matter
Department/Centre: Division of Physical & Mathematical Sciences > Centre for High Energy Physics
Date Deposited: 16 May 2023 09:34
Last Modified: 16 May 2023 09:34
URI: https://eprints.iisc.ac.in/id/eprint/81670

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