PT Journal
AU Hernandez, P
   Kekic, M
   Lopez-Pavon, J
TI Low-scale seesaw models versus N-eff
SO Physical Review D
JI Phys. Rev. D
PY 2014
BP 073009
EP 7pp
VL 89
IS 7
DI 10.1103/PhysRevD.89.073009
LA English
AB We consider the contribution of the extra sterile states in generic low-scale seesaw models to extra radiation, parametrized by N-eff. We find that the value of Neff 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 O(100 MeV).
ER