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      Cosmological solutions to the Lithium problem: Big-bang nucleosynthesis with photon cooling, \(X\)-particle decay and a primordial magnetic field

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          Abstract

          The \(^7\)Li abundance calculated in BBN with the baryon-to-photon ratio fixed from fits to the CMB power spectrum is inconsistent with the observed lithium abundances on the surface of metal-poor halo stars. Previous cosmological solutions proposed to resolve this \(^7\)Li problem include photon cooling (possibly via the Bose-Einstein condensation of a scalar particle) or the decay of a long-lived \(X-\)particle (possibly the next-to-lightest supersymmetric particle). In this paper we reanalyze these solutions, both separately and in concert. We also introduce the possibility of a primordial magnetic field (PMF) into these models. We constrain the \(X-\)particles and the PMF parameters by the observed light element abundances using a likelihood analysis to show that the inclusion of all three possibilities leads to an optimum solution to the lithium problem. We deduce allowed ranges for the \(X-\)particle parameters and energy density in the PMF that can solve \(^7\)Li problem.

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          Author and article information

          Journal
          30 June 2014
          Article
          10.1103/PhysRevD.90.023001
          1407.0021

          http://arxiv.org/licenses/nonexclusive-distrib/1.0/

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          Phys. Rev. D 90, 023001 (2014)
          11 pages, 3 figures. Accepted 4 June 2014 publication in Physical Review D
          astro-ph.CO hep-ph

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