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The European Physical Journal C

, Volume 68, Issue 3–4, pp 523–537 | Cite as

Fine-tuning favors mixed axion/axino cold dark matter over neutralinos in the minimal supergravity model

  • Howard BaerEmail author
  • Andrew D. Box
Regular Article - Theoretical Physics

Abstract

Over almost all of minimal supergravity (mSUGRA or CMSSM) model parameter space, there is a large overabundance of neutralino cold dark matter (CDM). We find that the allowed regions of mSUGRA parameter space which match the measured abundance of CDM in the universe are highly fine-tuned. If instead we invoke the Peccei–Quinn–Weinberg–Wilczek solution to the strong CP problem, then the SUSY CDM may consist of an axion/axino admixture with an axino mass of order the MeV scale, and where mixed axion/axino or mainly axion CDM seems preferred. In this case, fine-tuning of the relic density is typically much lower, showing that axion/axino CDM (\(a\tilde{a}\)CDM) is to be preferred in the paradigm model for SUSY phenomenology. For mSUGRA with \(a\tilde{a}\)CDM, quite different regions of parameter space are now DM-favored as compared to the case of neutralino DM. Thus, rather different SUSY signatures are expected at the LHC in the case of mSUGRA with \(a\tilde{a}\)CDM, as compared to mSUGRA with neutralino CDM.

Keywords

Dark Matter Cold Dark Matter Light SUSY Particle mSUGRA Model Gravitino Problem 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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© Springer-Verlag / Società Italiana di Fisica 2010

Authors and Affiliations

  1. 1.Department of Physics and AstronomyUniversity of OklahomaNormanUSA

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