Solution to Big-Bang Nucleosynthesis in Hybrid Axion Dark Matter Model

Physics Letters B (Impact Factor: 6.13). 02/2012; 718(3). DOI: 10.1016/j.physletb.2012.11.007
Source: arXiv


Following a recent suggestion of axion cooling of photons between the
nucleosynthesis and recombination epochs in the Early Universe, we investigate
a hybrid model with both axions and relic supersymmetric particles. In this
model we demonstrate that the 7Li abundance can be consistent with observations
without destroying the important concordance of deuterium abundance.

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Available from: Yamac Pehlivan, Apr 20, 2014
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    • "Unfortunately, this discrepancy is not immediately remedied simply by the presence of new light species, and the detailed model-building necessary to address this tension is beyond the scope of this paper. However, the 7 Li problem does present another exciting opportunity for the possible discovery of new physics [48] [49] [50] [51] [52]. "
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    ABSTRACT: We consider the effects of new light species on the Cosmic Microwave Background. In the massless limit, these effects can be parameterized in terms of a single number, the relativistic degrees of freedom. We perform a thorough survey of natural, minimal models containing new light species and numerically calculate the precise contribution of each of these models to this number in the framework of effective field theory. After reviewing the relevant details of early universe thermodynamics, we provide a map between the parameters of any particular theory and the predicted effective number of degrees of freedom. We then use this map to interpret the recent results from the Cosmic Microwave Background survey done by the Planck satellite. Using this data, we present new constraints on the parameter space of several models containing new light species. Future measurements of the Cosmic Microwave Background can be used with this map to further constrain the parameter space of all such models.
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    ABSTRACT: Non-standard model solutions to the łi7 problem are discussed. Particular attention is given to the possibility of a relatively long lived gravitino decay affecting the light element abundances. Gravitinos with masses between 4-5 TeV could significantly reduce the final łi7 abundance. Alternatively, a possible variation in the fundamental constants may also affect the łi7 abundance. In both cases, reduced łi7 is accompanied by an increased D/H abundance. This may have implications for the chemical evolution in quasar absorption systems.
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    ABSTRACT: The Big Bang Nucleosynthesis is the pillars of modern cosmology. It has recently been suggested theoretically that axions which are candidate for dark matter particles in the standard particle theory could condensate between the epochs of nucleosynthesis and last photon scattering in the early universe, which would result in cooling of photons with the shift of baryon-to-photon ratio between the two epochs. This renders a solution to the overproduction problem of primordial 7Li abundance. However, there arises another serious difficulty of overpredicting primordial deuterium abundance. We propose a hybrid dark matter model with both axions and relic super-symmetric particles to solve these overproduction problems of the primordial deuterium and 7Li abundances simultaneously. We also review several different cosmological models for the Big Bang Nucleosynthesis. © Copyright owned by the author(s) under the terms of the Creative Commons Attribution-NonCommercial- ShareAlike Licence.
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