6533b7d4fe1ef96bd126294b
RESEARCH PRODUCT
Low-scale seesaw models versusNeff
Jacobo Lopez-pavonPilar HernándezM. Kekicsubject
PhysicsNuclear and High Energy PhysicsSterile neutrinoParticle physics010308 nuclear & particles physicsPhysics beyond the Standard ModelHigh Energy Physics::PhenomenologyFísicaScale (descriptive set theory)Parameter space01 natural sciencesSeesaw molecular geometry0103 physical sciences010306 general physicsNeutrino oscillationdescription
We consider the contribution of the extra sterile states in generic low-scale seesaw models to extra radiation, parametrized by ${N}_{\text{eff}}$. We find that the value of ${N}_{\text{eff}}$ is roughly independent of the seesaw scale within a wide range. We explore the full parameter space in the case of two extra sterile states and find that these models are strongly constrained by cosmological data for any value of the seesaw scale below $\mathcal{O}(100\text{ }\text{ }\mathrm{MeV})$.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2014-04-09 | Physical Review D |