Bounds on Dirac Neutrino Masses from Nucleosynthesis

Abstract

We derive new bounds on the Dirac mass of the tau and muonic neutrinos. By solving the kinetic equation for the rate of energy deposition due to helicity flipping processes and imposing the constraint that the number of effective species contributing to the energy density at the time of nucleosynthesis be $\Delta k_{\nu }<0.3$, we find the bounds $m_{{\nu }_{\mu }}<150$ KeV and $m_{{\nu }_{\tau }}<190$ KeV for $T_{\mathrm{QCD}}=200$ MeV. The constraint $\Delta k_{\nu }<0.1$ leads to the much stronger bound $m_{\nu }<10$ KeV for both species of neutrinos.

10 pages, UM-TH-94-21, UMN-TH-1303-94, FERMILAB-Pub-94/199-A

References in corpus (4)

• New Upper Limits on the Tau Neutrino Mass from Primordial Helium Considerations
• Primordial Nucleosynthesis with a Decaying Tau Neutrino
• Constraints on Dirac Neutrinos from SN 1987A
• Cosmological Neutrino Mass Limit Revisited

Cited by in corpus (10)

• Neutrinos in cosmology
• Big Bang nucleosynthesis and physics beyond the Standard Model
• Theory of Neutrinos: A White Paper
• Constraining the Self-Interacting Neutrino Interpretation of the Hubble Tension
• Renormalization Group Evolution of Dirac Neutrino Masses
• An improved cosmological bound on the tau-neutrino mass
• Nucleosynthesis and the mass of the tau neutrino
• Nucleosynthesis Limits on the Mass of Long Lived Tau and Muon Neutrinos
• Restrictions on neutrino oscillations from BBN. Non-resonant case
• Creation of Dirac neutrinos in a dense medium with time-dependent effective potential