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Fermi National Accelerator Laboratory NASA/Fermilab Astrophysics Center

Summary: Fermi National Accelerator Laboratory
NASA/Fermilab Astrophysics Center
Bulk QCD thermodynamics and sterile neutrino dark matter
Kevork N. Abazajian 
NASA/Fermilab Astrophysics Group, Fermi National Accelerator Laboratory, Box 500, Batavia, Illinois 60510-0500
George M. Fuller y
Department of Physics, University of California, San Diego, La Jolla, California 92093-0319
(Dated: April 17, 2002)
We point out that the relic densities of singlet (sterile) neutrinos of interest in viable warm and
cold dark matter scenarios depend on the characteristics of the QCD transition in the early universe.
In the most promising of these dark matter scenarios the production of the singlets occurs at or
near the QCD transition. Since production of the singlets, their dilution, and the disappearance of
weak scatterers occur simultaneously, we calculate these processes contemporaneously to obtain ac-
curate predictions of relic sterile neutrino mass density. Therefore, a determination of the mass and
superweak mixing of the singlet neutrino through, for example, its radiative decay, along with a de-
termination of its contribution to the critical density, can provide insight into the nite-temperature
QCD transition.
PACS numbers: 95.35.+d,14.60.St,12.38.Mh,25.75.-q FERMILAB-Pub-02/067-A


Source: Abazajian, Kev - Theoretical Astrophysics, Fermilab


Collections: Physics