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dc.contributor.authorD'Eramo, Francesco
dc.contributor.authorThaler, Jesse
dc.contributor.authorMcCullough, Matthew P.
dc.date.accessioned2014-08-07T12:28:58Z
dc.date.available2014-08-07T12:28:58Z
dc.date.issued2013-04
dc.date.submitted2013-03
dc.identifier.issn1475-7516
dc.identifier.issn1475-7508
dc.identifier.urihttp://hdl.handle.net/1721.1/88558
dc.description.abstractHints in the Fermi data for a 130 GeV gamma line from the galactic center have ignited interest in potential gamma line signatures of dark matter. Explanations of this line based on dark matter annihilation face a parametric tension since they often rely on large enhancements of loop-suppressed cross sections. In this paper, we pursue an alternative possibility that dark matter gamma lines could arise from ''semi-annihilation'' among multiple dark sector states. The semi-annihilation reaction ψ[subscript i]ψ[subscript j] → ψ[subscript k]γ with a single final state photon is typically enhanced relative to ordinary annihilation ψi[bar over ψ]i → γγ into photon pairs. Semi-annihilation allows for a wide range of dark matter masses compared to the fixed mass value required by annihilation, opening the possibility to explain potential dark matter signatures at higher energies. The most striking prediction of semi-annihilation is the presence of multiple gamma lines, with as many as order N[superscript 3] lines possible for N dark sector states, allowing for dark sector spectroscopy. A smoking gun signature arises in the simplest case of degenerate dark matter, where a strong semi-annihilation line at 130 GeV would be accompanied by a weaker annihilation line at 173 GeV. As a proof of principle, we construct two explicit models of dark matter semi-annihilation, one based on non-Abelian vector dark matter and the other based on retrofitting Rayleigh dark matter.en_US
dc.description.sponsorshipUnited States. Dept. of Energy (Cooperative Research Agreement DE-FG02-05ER-41360)en_US
dc.description.sponsorshipMiller Institute for Basic Research in Scienceen_US
dc.description.sponsorshipSimons Foundation (Postdoctoral Fellowship)en_US
dc.description.sponsorshipUnited States. Dept. of Energy (Early Career Research Program DE-FG02-11ER-41741)en_US
dc.language.isoen_US
dc.publisherIOP Publishingen_US
dc.relation.isversionofhttp://dx.doi.org/10.1088/1475-7516/2013/04/030en_US
dc.rightsCreative Commons Attribution-Noncommercial-Share Alikeen_US
dc.rights.urihttp://creativecommons.org/licenses/by-nc-sa/4.0/en_US
dc.sourcearXiven_US
dc.titleMultiple gamma lines from semi-annihilationen_US
dc.typeArticleen_US
dc.identifier.citationD’Eramo, Francesco, Matthew McCullough, and Jesse Thaler. “Multiple Gamma Lines from Semi-Annihilation.” J. Cosmol. Astropart. Phys. 2013, no. 04 (April 1, 2013): 030–030.en_US
dc.contributor.departmentMassachusetts Institute of Technology. Center for Theoretical Physicsen_US
dc.contributor.departmentMassachusetts Institute of Technology. Department of Physicsen_US
dc.contributor.mitauthorD'Eramo, Francescoen_US
dc.contributor.mitauthorMcCullough, Matthew P.en_US
dc.contributor.mitauthorThaler, Jesseen_US
dc.relation.journalJournal of Cosmology and Astroparticle Physicsen_US
dc.eprint.versionOriginal manuscripten_US
dc.type.urihttp://purl.org/eprint/type/JournalArticleen_US
eprint.statushttp://purl.org/eprint/status/NonPeerRevieweden_US
dspace.orderedauthorsD'Eramo, Francesco; McCullough, Matthew; Thaler, Jesseen_US
dc.identifier.orcidhttps://orcid.org/0000-0002-2406-8160
dspace.mitauthor.errortrue
mit.licenseOPEN_ACCESS_POLICYen_US


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