Bound states of pseudo-Dirac dark matter
Name
1812.03169.pdf
Description
Submitted version
Size
1.02 MB
Format
Adobe PDF
Checksum (MD5)
48ff4b4b1eceda34b2409786513f5630
Author(s)
Bhattacharya, Arindam
Slatyer, Tracy R
Date Issued
2019
Journal
Journal of Cosmology and Astroparticle Physics
Publisher
IOP Publishing
Version
Original manuscript
Abstract
© 2019 IOP Publishing Ltd and Sissa Medialab. We study the bound-state spectrum in a simple model of pseudo-Dirac dark matter, and examine how the rate of bound-state formation through radiative capture compares to Sommerfeld-enhanced annihilation. We use this model as an example to delineate the new features induced by the presence of a mass splitting between the dark matter and a nearly-degenerate partner, compared to the case where only a single dark-matter-like state is present. We provide a simple analytic prescription for estimating the spectrum of bound states in systems containing a mass splitting, which in turn allows characterization of the resonances due to near-zero-energy bound states, and validate this estimate both for pseudo-Dirac dark matter and for the more complex case of wino dark matter. We demonstrate that for pseudo-Dirac dark matter the capture rate into deeply bound states is, to a good approximation, simply related to the Sommerfeld enhancement factor.
MIT Department
Massachusetts Institute of Technology. Center for Theoretical Physics
Massachusetts Institute of Technology. Department of Physics
Terms of Use
Creative Commons Attribution-Noncommercial-Share Alike
Persistent DSpace Link
DOI of Published Version
https://doi.org/10.1088/1475-7516/2019/03/029
