Superheavy dark Matter

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If there exists fields of mass of the order of 10{sup 13} GeV and large field inflation occurs, their interaction with classical gravitation will generate enough particles to give the universe critical density today regardless of their nongravitational coupling. In the standard dark matter scenarios, WIMPs are usually considered to have once been in local thermodynamic equilibrium (LTE), and their present abundance is determined by their self-annihilation cross section. In that case, unitarity and the lower bound on the age of the universe constrains the mass of the relic to be less than 500 TeV. On the other hand, if ... continued below

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139 Kilobytes pages

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Chung, Daniel May 25, 2000.

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If there exists fields of mass of the order of 10{sup 13} GeV and large field inflation occurs, their interaction with classical gravitation will generate enough particles to give the universe critical density today regardless of their nongravitational coupling. In the standard dark matter scenarios, WIMPs are usually considered to have once been in local thermodynamic equilibrium (LTE), and their present abundance is determined by their self-annihilation cross section. In that case, unitarity and the lower bound on the age of the universe constrains the mass of the relic to be less than 500 TeV. On the other hand, if the DM particles never attained LTE in the past, self-annihilation cross section does not determine their abundance. For example, axions, which may never have been in LTE, can have their abundance determined by the dynamics of the phase transition associated with the breaking of U(1){sub PQ}. These nonthermal relics (ones that never obtained LTE) are typically light. However, there are mechanisms that can produce superheavy (many orders of magnitude greater than the weak scale) nonthermal relics. Some of this is reviewed in reference 2. Although not known at the time when this talk was given, it is now known that if the DM fields are coupled to the inflaton field, then the mass of the DM particles that can be naturally produced in significant abundance after inflation can be as large as 10{sup {minus}3} M{sub Pl} (paper in preparation). The author discusses the gravitational production mechanism which is a generic consequence of any large field inflationary phase ending.

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139 Kilobytes pages

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  • 6th International Symposium on Particles, Strings, and Cosmology, Boston, MA (US), 03/22/1998--03/27/1998

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  • Report No.: FERMILAB-Conf-98/245-A
  • Grant Number: AC02-76CH03000
  • Office of Scientific & Technical Information Report Number: 755544
  • Archival Resource Key: ark:/67531/metadc704722

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  • May 25, 2000

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  • Sept. 12, 2015, 6:31 a.m.

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  • April 1, 2016, 7:03 p.m.

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Chung, Daniel. Superheavy dark Matter, article, May 25, 2000; Batavia, Illinois. (digital.library.unt.edu/ark:/67531/metadc704722/: accessed September 22, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.