Neutrino energy transport in weak decoupling and big bang nucleosynthesis

Grohs, Evan Bradley; Paris, Mark W.; Kishimoto, Chad T.; Fuller, George M.; Vlasenko, Alexey

doi:10.1103/PhysRevD.93.083522

Title: Neutrino energy transport in weak decoupling and big bang nucleosynthesis

Journal Article · Thu Apr 21 00:00:00 EDT 2016 · Physical Review D

DOI:https://doi.org/10.1103/PhysRevD.93.083522· OSTI ID:1291294

Grohs, Evan Bradley ^[1]; Paris, Mark W. ^[2]; Kishimoto, Chad T. ^[3]; Fuller, George M. ^[4]; Vlasenko, Alexey ^[5]

Univ. of California, San Diego, La Jolla, CA (United States); Univ. of Michigan, Ann Arbor, MI (United States)
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Univ. of California, San Diego, La Jolla, CA (United States); Univ. of San Diego, San Diego, CA (United States)
Univ. of California, San Diego, La Jolla, CA (United States)
Univ. of California, San Diego, La Jolla, CA (United States); North Carolina State Univ., Raleigh, NC (United States)

In this study, we calculate the evolution of the early universe through the epochs of weak decoupling, weak freeze-out and big bang nucleosynthesis (BBN) by simultaneously coupling a full strong, electromagnetic, and weak nuclear reaction network with a multienergy group Boltzmann neutrino energy transport scheme. The modular structure of our code provides the ability to dissect the relative contributions of each process responsible for evolving the dynamics of the early universe in the absence of neutrino flavor oscillations. Such an approach allows a detailed accounting of the evolution of the νe, ν¯e, νμ, ν¯μ, ντ, ν¯τ energy distribution functions alongside and self-consistently with the nuclear reactions and entropy/heat generation and flow between the neutrino and photon/electron/positron/baryon plasma components. This calculation reveals nonlinear feedback in the time evolution of neutrino distribution functions and plasma thermodynamic conditions (e.g., electron-positron pair densities), with implications for the phasing between scale factor and plasma temperature; the neutron-to-proton ratio; light-element abundance histories; and the cosmological parameter N_eff. We find that our approach of following the time development of neutrino spectral distortions and concomitant entropy production and extraction from the plasma results in changes in the computed value of the BBN deuterium yield. For example, for particular implementations of quantum corrections in plasma thermodynamics, our calculations show a 0.4% increase in deuterium. These changes are potentially significant in the context of anticipated improvements in observational and nuclear physics uncertainties.

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Research Organization:: Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)

Sponsoring Organization:: USDOE Laboratory Directed Research and Development (LDRD) Program

Grant/Contract Number:: AC52-06NA25396; 257842

OSTI ID:: 1291294

Alternate ID(s):: OSTI ID: 1249651

Report Number(s):: LA-UR-15-29163

Journal Information:: Physical Review D, Vol. 93, Issue 8; ISSN 2470-0010

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 70 works

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