6533b7dcfe1ef96bd127339f
RESEARCH PRODUCT
Neutrino conversions in hot plasma
Kari EngvistJukka MaalampiV. B. Semikozsubject
PhysicsNuclear and High Energy PhysicsSterile neutrinoParticle physics010308 nuclear & particles physicsmedia_common.quotation_subjectFOS: Physical sciencesPlasma01 natural sciencesUniverseMagnetic fieldHigh Energy Physics - PhenomenologyHigh Energy Physics - Phenomenology (hep-ph)Nucleosynthesis0103 physical sciencesNeutrino010306 general physicsQuantumSpin-½media_commondescription
We discuss the excitation of sterile neutrinos in the early universe using general quantum kinetic equations, which also incorporate a possible primordial magnetic field $B$. We find a new contribution to the excitation propability, which has its origin in the shrinkage of the spin vector. In the absence of $B$ nucleosynthesis implies the constraint $\mid \Delta m^2\mid\sin^22\theta_0\lsim 1.6\times 10^{-6}~{\rm eV}^2$ which is more restrictive than previous estimates. We also present examples of possible stringent limits for $B\ne 0$.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 1995-12-01 |