Non-equilibrium corrections to the spectra of massless neutrinos in the early universe

Dolgov, A. D.; Hansen, Steen H.; Semikoz, D.

doi:10.1016/s0550-3213(97)00479-3

Cited by 201 publications

(345 citation statements)

References 12 publications

Supporting

Mentioning

327

Contrasting

Unclassified

Order By: Relevance

“…[18,19,20,31,32,33,34]. Our formulation almost goes in parallel with the nomixing case and we use some of the useful techniques discussed in those papers.…”

Section: Neutrino Thermalizationmentioning

confidence: 99%

Oscillation effects on thermalization of the neutrinos in the universe with low reheating temperature

2005

View full text Add to dashboard Cite

We study how the oscillations of the neutrinos affect their thermalization process during the reheating period with temperature O(1) MeV in the early universe. We follow the evolution of the neutrino density matrices and investigate how the predictions of big bang nucleosynthesis vary with the reheating temperature. For the reheating temperature of several MeV, we find that including the oscillations makes different predictions, especially for 4 He abundance. Also, the effects on the lower bound of the reheating temperature from cosmological observations are discussed.

show abstract

“…[18,19,20,31,32,33,34]. Our formulation almost goes in parallel with the nomixing case and we use some of the useful techniques discussed in those papers.…”

Section: Neutrino Thermalizationmentioning

confidence: 99%

Oscillation effects on thermalization of the neutrinos in the universe with low reheating temperature

2005

View full text Add to dashboard Cite

show abstract

“…[7], hereafter DHS). Our work shows that the magnitude of these effects can be significantly larger, depending on assumed microphysics.…”

Section: Introductionmentioning

confidence: 99%

Neutrino energy transport in weak decoupling and big bang nucleosynthesis

et al. 2016

View full text Add to dashboard Cite

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 multi-energy 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,νe, νµ,νµ, ντ ,ντ 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 obversational and nuclear physics uncertainties.PACS numbers: 95.85.Ry,14.60.Lm,26.35.+c,98.70.Vc

show abstract

“…[21] the photon temperature drops in comparison with the standard one by 10 −3 , due to the above mentioned transfer of energy from the electromagnetic component of the plasma to neutrinos. This change of temperature should be proportional in a crude approximation to the above mentioned change of neutrino energy:…”

mentioning

confidence: 94%

Varying leptonic chemical potentials and spatial variation of primordial deuterium at high z

Dolgov¹,

Pagel

1999

New Astronomy

Self Cite

View full text Add to dashboard Cite

Non-equilibrium corrections to the spectra of massless neutrinos in the early universe

Cited by 201 publications

References 12 publications

Oscillation effects on thermalization of the neutrinos in the universe with low reheating temperature

Oscillation effects on thermalization of the neutrinos in the universe with low reheating temperature

Neutrino energy transport in weak decoupling and big bang nucleosynthesis

Varying leptonic chemical potentials and spatial variation of primordial deuterium at high z

Contact Info

Product

Resources

About