Cosmological Solutions to the Lithium Problem

Abstract

The abundance of primordial lithium is derived from the observed spectroscopy of metal-poor stars in the galactic halo. However, the observationally inferred abundance remains at about a factor of three below the abundance predicted by standard big bang nucleosynthesis (BBN). The resolution of this dilemma can be either astrophysical (stars destroy lithium after BBN), nuclear (reactions destroy lithium during BBN), or cosmological, i.e. new physics beyond the standard BBN is responsible for destroying lithium. Here, we overview a variety of possible cosmological solutions, and their shortcomings. On the one hand, we examine the possibility of physical processes that modify the velocity distribution of particles from the usually assumed Maxwell-Boltzmann statistics. A physical justification for this is an inhomogeneous spatial distribution of domains of primordial magnetic field strength as a means to reduce the primordial lithium abundance. Another possibility is that scattering with the mildly relativistic electrons in the background plasma alters the baryon distribution to one resembling a Fermi-Dirac distribution. We show that neither of these possibilities can adequately resolve the lithium problem. A number of alternate hybrid models are discussed including a mix of neutrino degeneracy, unified dark matter, axion cooling, and the presence of decaying and/or charged supersymmetric particles.

arXiv comment6 pages, 0 figures, conference proceedings

References in corpus (33)

• Planck 2015 results. XIII. Cosmological parameters
• Big Bang Nucleosynthesis: 2015
• One percent determination of the primordial deuterium abundance
• Primordial Nucleosynthesis: from precision cosmology to fundamental physics
• The effects of He I 10830 on helium abundance determinations
• Precision big bang nucleosynthesis with improved Helium-4 predictions
• Precision measures of the primordial abundance of deuterium
• Compilation and R-matrix analysis of Big Bang nuclear reaction rates
• Implications of WMAP observations on Li abundance and stellar evolution models
• A New Approach to Systematic Uncertainties and Self-Consistency in Helium Abundance Determinations
• Observational evidence for a broken Li Spite plateau and mass-dependent Li depletion
• The primordial helium abundance from updated emissivities
• The primordial deuterium abundance of the most metal-poor damped Lyman-alpha system
• Big Bang Nucleosynthesis with a New Neutron Lifetime
• Primordial nucleosynthesis
• Non-extensive Statistics Solution to the Cosmological Lithium Problem
• A New World Average Value for the Neutron Lifetime
• Big Bang Nucleosynthesis with an Inhomogeneous Primordial Magnetic Field Strength
• Revised Big Bang Nucleosynthesis with long-lived negatively charged massive particles: updated recombination rates, primordial 9Be nucleosynthesis, and impact of new 6Li limits
• Introduction to Big Bang Nucleosynthesis and Modern Cosmology
• Cosmological solutions to the Lithium problem: Big-bang nucleosynthesis with photon cooling, $X$-particle decay and a primordial magnetic field
• Big Bang nucleosynthesis with a non-Maxwellian distribution
• Time Dependent Quark Masses and Big Bang Nucleosynthesis Revisited
• Big-Bang nucleosynthyesis: constraints on nuclear reaction rates, neutrino degeneracy, inhomogeneous and Brans-Dicke models
• Review on Effects of Long-lived Negatively Charged Massive Particles on Big Bang Nucleosynthesis
• Roles of ${}^7$Be$(n,p{)}^7$Li resonances in big bang nucleosynthesis with time-dependent quark mass and Li reduction by a heavy quark mass
• Quantum Statistical Corrections to Astrophysical Photodisintegration Rates
• On the relative velocity distribution for general statistics and an application to big-bang nucleosynthesis under Tsallis statistics
• Grad's moment method for relativistic gas mixtures of Maxwellian particles
• A Solution to Lithium Problem by Long-Lived Stau
• Revised Uncertainties in Big Bang Nucleosynthesis
• The Boltzmann equation in special and general relativity
• Impact of Neutrino Properties and Dark Matter on the Primordial Lithium Production

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