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Prospects for detecting a net photon circular polarization produced by decaying dark matter
Univ Chicago, Enrico Fermi Inst, 5640 S Ellis Ave, Chicago, IL 60637 USA..
Univ Hawaii, Dept Phys & Astron, Honolulu, HI 96822 USA..
Univ Utah, Dept Phys & Astron, Salt Lake City, UT 84112 USA..
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Theoretical Physics. Univ Utah, Dept Phys & Astron, Salt Lake City, UT 84112 USA.
2017 (English)In: Physical Review D: covering particles, fields, gravitation, and cosmology, ISSN 2470-0010, E-ISSN 2470-0029, Vol. 96, no 9, article id 096008Article in journal (Refereed) Published
Abstract [en]

If dark matter interactions with Standard Model particles are CP violating, then dark matter annihilation/decay can produce photons with a net circular polarization. We consider the prospects for experimentally detecting evidence for such a circular polarization. We identify optimal models for dark matter interactions with the Standard Model, from the point of view of detectability of the net polarization, for the case of either symmetric or asymmetric dark matter. We find that, for symmetric dark matter, evidence for net polarization could be found by a search of the Galactic center by an instrument sensitive to circular polarization with an efficiency-weighted exposure of at least 50; 000 cm(2) yr, provided the systematic detector uncertainties are constrained at the 1% level. Better sensitivity can be obtained in the case of asymmetric dark matter. We discuss the prospects for achieving the needed level of performance using possible detector technologies.

Place, publisher, year, edition, pages
2017. Vol. 96, no 9, article id 096008
National Category
Astronomy, Astrophysics and Cosmology
Identifiers
URN: urn:nbn:se:uu:diva-341991DOI: 10.1103/PhysRevD.96.096008ISI: 000414959300016OAI: oai:DiVA.org:uu-341991DiVA, id: diva2:1183386
Funder
Knut and Alice Wallenberg Foundation, KAW 2013.0235Ragnar Söderbergs stiftelse, S1/16Available from: 2018-02-16 Created: 2018-02-16 Last updated: 2018-02-16Bibliographically approved

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Teng, Fei

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