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Effectively Stable Dark Matter

Cheung, Clifford and Sanford, David (2015) Effectively Stable Dark Matter. . (Submitted)

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We study dark matter (DM) which is cosmologically long-lived because of standard model (SM) symmetries. In these models an approximate stabilizing symmetry emerges accidentally, in analogy with baryon and lepton number in the renormalizable SM. Adopting an effective theory approach, we classify DM models according to representations of $SU(3)_C\times SU(2)_L\times U(1)_Y \times U(1)_B\times U(1)_L$, allowing for all operators permitted by symmetry, with weak scale DM and a cutoff at or below the Planck scale. We identify representations containing a neutral long-lived state, thus excluding dimension four and five operators that mediate dangerously prompt DM decay into SM particles. The DM relic abundance is obtained via thermal freeze-out or, since effectively stable DM often carries baryon or lepton number, asymmetry sharing through the very operators that induce eventual DM decay. We also incorporate baryon and lepton number violation with a spurion that parameterizes hard breaking by arbitrary units. However, since proton stability precludes certain spurions, a residual symmetry persists, maintaining the cosmological stability of certain DM representations. Finally, we survey the phenomenology of effectively stable DM as manifested in probes of direct detection, indirect detection, and proton decay.

Item Type:Report or Paper (Discussion Paper)
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Additional Information:CC is supported by a DOE Early Career Award DESC0010255 and a Sloan Research Fellowship. DS is supported in part by U.S. Department of Energy grant DE– FG02–92ER40701 and by the Gordon and Betty Moore Foundation through Grant No. 776 to the Caltech Moore Center for Theoretical Cosmology and Physics.
Group:Walter Burke Institute for Theoretical Physics, Moore Center for Theoretical Cosmology and Physics
Funding AgencyGrant Number
Department of Energy (DOE)DESC0010255
Department of Energy (DOE)DE– FG02–92ER40701
Gordon and Betty Moore Foundation776
Alfred P. Sloan FoundationUNSPECIFIED
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Record Number:CaltechAUTHORS:20150731-184249348
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:59125
Deposited By: Joy Painter
Deposited On:06 Aug 2015 18:40
Last Modified:03 Oct 2019 08:43

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