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Dark matter dynamics in the early universe

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dc.contributor.advisor Jesse Thaler. en_US
dc.contributor.author Fei, Lin, S.B. Massachusetts Institute of Technology en_US
dc.contributor.other Massachusetts Institute of Technology. Dept. of Physics. en_US
dc.date.accessioned 2012-09-13T19:36:42Z
dc.date.available 2012-09-13T19:36:42Z
dc.date.copyright 2012 en_US
dc.date.issued 2012 en_US
dc.identifier.uri http://hdl.handle.net/1721.1/72934
dc.description Thesis (S.B.)--Massachusetts Institute of Technology, Dept. of Physics, 2012. en_US
dc.description Cataloged from PDF version of thesis. en_US
dc.description Includes bibliographical references (p. 39). en_US
dc.description.abstract We study a new form of dark matter interaction which may significantly affect the thermal relic abundance of dark matter. This new interaction takes the form C+D --> C+[phi], where D is the dark matter species present today, [phi] is a standard model species, and C is a very heavy exotic particle. In particular, C was present during the period when freeze-out occurred for dark matter species D, but subsequently decayed into standard model particles. We refer to this process as a catalytic reaction, since C acts as a catalyst for the destruction of D. We further postulate that there is a matter-antimatter asymmetry in C, so that C+C --> D+[phi] is suppressed. We find that the catalytic reaction produces very different dynamics than the standard annihilation reaction. We also find that the catalytic reaction can significantly affect the relic abundance of dark matter even if it has a much smaller cross section than the annihilation reaction. Possible physical origins for this catalytic reaction are discussed. en_US
dc.description.statementofresponsibility by Fei Lin. en_US
dc.format.extent 39 p. en_US
dc.language.iso eng en_US
dc.publisher Massachusetts Institute of Technology en_US
dc.rights M.I.T. theses are protected by copyright. They may be viewed from this source for any purpose, but reproduction or distribution in any format is prohibited without written permission. See provided URL for inquiries about permission. en_US
dc.rights.uri http://dspace.mit.edu/handle/1721.1/7582 en_US
dc.subject Physics. en_US
dc.title Dark matter dynamics in the early universe en_US
dc.type Thesis en_US
dc.description.degree S.B. en_US
dc.contributor.department Massachusetts Institute of Technology. Dept. of Physics. en_US
dc.identifier.oclc 807231772 en_US


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