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Strong CMB Constraint On P-Wave Annihilating Dark Matter

An, Haipeng and Wise, Mark B. and Zhang, Yue (2017) Strong CMB Constraint On P-Wave Annihilating Dark Matter. Physics Letters B, 773 . pp. 121-124. ISSN 0370-2693. doi:10.1016/j.physletb.2017.08.010.

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We consider a dark sector consisting of dark matter that is a Dirac fermion and a scalar mediator. This model has been extensively studied in the past. If the scalar couples to the dark matter in a parity conserving manner then dark matter annihilation to two mediators is dominated by the P-wave channel and hence is suppressed at very low momentum. The indirect detection constraint from the anisotropy of the Cosmic Microwave Background is usually thought to be absent in the model because of this suppression. In this letter we show that dark matter annihilation via bound state formation occurs through the S-wave and hence there is a constraint on the parameter space of the model from the Cosmic Microwave Background.

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Additional Information:© 2017 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY license ( Funded by SCOAP3. Received 26 September 2016, Revised 7 August 2017, Accepted 10 August 2017, Available online 16 August 2017. We acknowledge an illuminating conversation with Haibo Yu. This work is supported by the DOE Grant DE-SC0011632, DE-SC0010255, and by the Gordon and Betty Moore Foundation through Grant No. 776 to the Caltech Moore Center for Theoretical Cosmology and Physics. We are also grateful for the support provided by the Walter Burke Institute for Theoretical Physics.
Group:Walter Burke Institute for Theoretical Physics, Moore Center for Theoretical Cosmology and Physics
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Department of Energy (DOE)DE-SC0011632
Department of Energy (DOE)DE-SC0010255
Gordon and Betty Moore Foundation776
Walter Burke Institute for Theoretical Physics, CaltechUNSPECIFIED
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Record Number:CaltechAUTHORS:20160615-155545845
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Official Citation:Haipeng An, Mark B. Wise, Yue Zhang, Strong CMB constraint on P-wave annihilating dark matter, Physics Letters B, Volume 773, 10 October 2017, Pages 121-124, ISSN 0370-2693, (
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:67952
Deposited By: Joy Painter
Deposited On:15 Jun 2016 23:05
Last Modified:11 Nov 2021 03:57

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