Bounds on neutrino-scalar nonstandard interactions from big bang nucleosynthesis. (arXiv:2009.08104v2 [hep-ph] UPDATED)
<a href="http://arxiv.org/find/hep-ph/1/au:+Venzor_J/0/1/0/all/0/1">Jorge Venzor</a>, <a href="http://arxiv.org/find/hep-ph/1/au:+Perez_Lorenzana_A/0/1/0/all/0/1">Abdel P&#xe9;rez-Lorenzana</a>, <a href="http://arxiv.org/find/hep-ph/1/au:+De_Santiago_J/0/1/0/all/0/1">Josue De-Santiago</a>

Coherent forward scattering processes by neutrino-scalar nonstandard
interactions (SNSI) induce an effective neutrino mass. In the Early Universe, a
large neutrino effective mass restricts the production of neutrinos. The SNSI
effect is modulated by two effective couplings, these account for the coupling
between neutrinos and electrons/positrons, $G_{rm eff}$, and the neutrino
self-interaction, $G_{rm S}$. These parameters are directly related to the
effective number of relativistic species and non-zero values imply a smaller
than expected $N_{rm eff}$. We employ big bang nucleosynthesis to constraint
the SNSI effect. We find that $ G_{rm eff }< 1.2$ MeV$^{-2}$ and $ G_{rm S }<
2.0 times 10^{7}$ MeV$^{-2}$ at 68% CL. For a scalar mass in the range
$10^{-15} {rm eV}lesssim m_{phi}lesssim 10^{-5}{rm eV}$, our
neutrino-scalar coupling constraint is more restrictive than any previous
result.

Coherent forward scattering processes by neutrino-scalar nonstandard
interactions (SNSI) induce an effective neutrino mass. In the Early Universe, a
large neutrino effective mass restricts the production of neutrinos. The SNSI
effect is modulated by two effective couplings, these account for the coupling
between neutrinos and electrons/positrons, $G_{rm eff}$, and the neutrino
self-interaction, $G_{rm S}$. These parameters are directly related to the
effective number of relativistic species and non-zero values imply a smaller
than expected $N_{rm eff}$. We employ big bang nucleosynthesis to constraint
the SNSI effect. We find that $ G_{rm eff }< 1.2$ MeV$^{-2}$ and $ G_{rm S }<
2.0 times 10^{7}$ MeV$^{-2}$ at 68% CL. For a scalar mass in the range
$10^{-15} {rm eV}lesssim m_{phi}lesssim 10^{-5}{rm eV}$, our
neutrino-scalar coupling constraint is more restrictive than any previous
result.

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