Cosmological consequences of Yukawa-unified SUSY with mixed axion/axino cold and warm dark matter

Journal Article · Sun Feb 15 00:00:00 EST 2009 · Journal of Cosmology and Astroparticle Physics

DOI:https://doi.org/10.1088/1475-7516/2009/02/002· OSTI ID:22156887

Baer, Howard; Summy, Heaya ^[1]; Haider, Markus; Kraml, Sabine ^[2]; Sekmen, Sezen ^[3]

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1. Dept. of Physics and Astronomy, University of Oklahoma, 440 West Brooks, Norman, OK 73019 (United States)
2. Laboratoire de Physique Subatomique et de Cosmologie, UJF Grenoble 1, CNRS/IN2P3, INPG, 53 Avenue des Martyrs, F-38026 Grenoble (France)
3. Department of Physics, Middle East Technical Univ., Inoenue Boulevard, TR-06531 Ankara (Turkey)

Supersymmetric models with t-b-{tau} Yukawa unification at M{sub GUT} qualitatively predict a sparticle mass spectrum including first and second generation scalars at the 3-15 TeV scale, third generation scalars at the (few) TeV scale and gluinos in the sub-TeV range. The neutralino relic density in these models typically turns out to lie far above the measured dark matter abundance, prompting the suggestion that instead dark matter is composed of an axion/axino mixture. We explore the axion and thermal and non-thermal axino dark matter abundance in Yukawa-unified SUSY models. We find in this scenario that (i) rather large values of Peccei-Quinn symmetry breaking scale f{sub a} {approx} 10{sup 12} GeV are favored and (ii) rather large values of GUT scale scalar masses {approx} 10-15 TeV allow for the re-heat temperature T{sub R} of the universe to be T{sub R} {approx}> 10{sup 6} GeV. This allows in turn a solution to the gravitino/Big Bang Nucleosynthesis problem while also allowing for baryogenesis via non-thermal leptogenesis. The large scalar masses for Yukawa-unified models are also favored by data on b {yields} s{gamma} and B{sub s} {yields} {mu}{sup +}{mu}{sup -} decay. Testable consequences from this scenario include a possible axion detection at axion search experiments, but null results from direct and indirect WIMP search experiments.

• OSTI ID: 22156887
• Journal Information: Journal of Cosmology and Astroparticle Physics, Vol. 2009, Issue 02; Other Information: Country of input: International Atomic Energy Agency (IAEA); ISSN 1475-7516
• Country of Publication: United States
• Language: English

Related Subjects

79 ASTROPHYSICS
COSMOLOGY AND ASTRONOMY
B S MESONS
DENSITY
GEV RANGE
MASS SPECTRA
MATHEMATICAL SOLUTIONS
NONLUMINOUS MATTER
NUCLEOSYNTHESIS
PARTICLE DECAY
PARTICLE PRODUCTION
RELICT RADIATION
SUPERSYMMETRY
SYMMETRY BREAKING
TEMPERATURE DEPENDENCE
TEV RANGE
UNIFIED MODEL
UNIVERSE
YUKAWA NONLOCAL THEORY
GLUINOS