Neutrino energy transport in weak decoupling and big bang nucleosynthesis

被引：92

作者：

Grohs, E. ^{[1
,2
]}

Fuller, G. M. ^{[1
]}

Kishimoto, C. T. ^{[1
,3
]}

Paris, M. W. ^{[4
]}

Vlasenko, A. ^{[1
,5
]}

机构：

[1] Univ Calif San Diego, Dept Phys, La Jolla, CA 92093 USA

[2] Univ Michigan, Dept Phys, Ann Arbor, MI 48109 USA

[3] Univ San Diego, Dept Phys & Biophys, San Diego, CA 92110 USA

[4] Los Alamos Natl Lab, Div Theoret, Los Alamos, NM 87545 USA

[5] N Carolina State Univ, Dept Phys, Raleigh, NC 27695 USA

来源：

PHYSICAL REVIEW D | 2016年 / 93卷 / 08期

基金：

美国国家科学基金会;

关键词：

PRIMORDIAL NUCLEOSYNTHESIS; NONEQUILIBRIUM CORRECTIONS; MASSLESS NEUTRINOS; SPECTRA; TEMPERATURES; DEUTERIUM; ABUNDANCE; ELEMENTS; DENSITY;

D O I：

10.1103/PhysRevD.93.083522

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

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 nu(e), (nu) over bar (e), nu(mu), (nu) over bar (mu), nu(tau), (nu) over bar (tau) 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.

引用

页数：34

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