Coupled Boltzmann calculation of mixed axion/neutralino cold dark matter production in the early universe
Contribuinte(s) |
UNIVERSIDADE DE SÃO PAULO |
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Data(s) |
14/10/2013
14/10/2013
2012
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Resumo |
We calculate the relic abundance of mixed axion/neutralino cold dark matter which arises in R-parity conserving supersymmetric (SUSY) models wherein the strong CP problem is solved by the Peccei-Quinn (PQ) mechanism with a concommitant axion/saxion/axino supermultiplet. By numerically solving the coupled Boltzmann equations, we include the combined effects of 1. thermal axino production with cascade decays to a neutralino LSP, 2. thermal saxion production and production via coherent oscillations along with cascade decays and entropy injection, 3. thermal neutralino production and re-annihilation after both axino and saxion decays, 4. gravitino production and decay and 5. axion production both thermally and via oscillations. For SUSY models with too high a standard neutralino thermal abundance, we find the combined effect of SUSY PQ particles is not enough to lower the neutralino abundance down to its measured value, while at the same time respecting bounds on late-decaying neutral particles from BBN. However, models with a standard neutralino underabundance can now be allowed with either neutralino or axion domination of dark matter, and furthermore, these models can allow the PQ breaking scale f(a) to be pushed up into the 10(14) - 10(15) GeV range, which is where it is typically expected to be in string theory models. U.S. Department of Energy US Department of Energy Fulbright Program Fulbright Program CAPES CAPES FAPESP FAPESP |
Identificador |
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS, BRISTOL, v. 55, n. 1, supl. 4, Part 1-2, pp. 339-342, JAN, 2012 1475-7516 http://www.producao.usp.br/handle/BDPI/35039 10.1088/1475-7516/2012/01/036 |
Idioma(s) |
eng |
Publicador |
IOP PUBLISHING LTD BRISTOL |
Relação |
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS |
Direitos |
restrictedAccess Copyright IOP PUBLISHING LTD |
Palavras-Chave | #DARK MATTER THEORY #AXIONS #SUPERSYMMETRY AND COSMOLOGY #COSMOLOGY OF THEORIES BEYOND THE SM #STRONG CP PROBLEM #FOCUS POINT SUPERSYMMETRY #LARGE HADRON COLLIDER #MINIMAL SUPERGRAVITY #COSMOLOGICAL IMPLICATIONS #ASTROPHYSICAL BOUNDS #DECAYING PARTICLES #INVISIBLE AXION #HARMLESS AXION #UNIFICATION #ASTRONOMY & ASTROPHYSICS #PHYSICS, PARTICLES & FIELDS |
Tipo |
article original article publishedVersion |