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Csáki C, Hong S, Kurup G, Lee SJ, Perelstein M, Xue W. Z-Portal Continuum Dark Matter. PHYSICAL REVIEW LETTERS 2022; 128:081807. [PMID: 35275670 DOI: 10.1103/physrevlett.128.081807] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/26/2021] [Revised: 12/20/2021] [Accepted: 12/24/2021] [Indexed: 06/14/2023]
Abstract
We examine the possibility that dark matter (DM) consists of a gapped continuum, rather than ordinary particles. A weakly interacting continuum (WIC) model, coupled to the standard model via a Z portal, provides an explicit realization of this idea. The thermal DM relic density in this model is naturally consistent with observations, providing a continuum counterpart of the "WIMP miracle." Direct detection cross sections are strongly suppressed compared to ordinary Z-portal WIMP, thanks to a unique effect of the continuum kinematics. Continuum DM states decay throughout the history of the Universe, and observations of cosmic microwave background place constraints on potential late decays. Production of WICs at colliders can provide a striking cascade-decay signature. We show that a simple Z-portal WIC model provides a fully viable DM candidate consistent with all current experimental constraints.
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Affiliation(s)
- Csaba Csáki
- Department of Physics, LEPP, Cornell University, Ithaca, New York 14853, USA
| | - Sungwoo Hong
- Department of Physics, LEPP, Cornell University, Ithaca, New York 14853, USA
- Department of Physics, The University of Chicago, Chicago, Illinois 60637, USA
- Argonne National Laboratory, Lemont, Illinois 60439, USA
| | - Gowri Kurup
- Department of Physics, LEPP, Cornell University, Ithaca, New York 14853, USA
- Department of Physics, University of Oxford, Parks Road, Oxford OX1 3PJ, United Kingdom
| | - Seung J Lee
- Department of Physics, Korea University, Seoul 136-713, Korea
| | - Maxim Perelstein
- Department of Physics, LEPP, Cornell University, Ithaca, New York 14853, USA
| | - Wei Xue
- Department of Physics, University of Florida, Gainesville, Florida 32611, USA
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