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Number of Neutrino Types
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Number Coupling with Less Than Full Weak Strength
Limits from Astrophysics and Cosmology
Number Coupling with Less Than Full Weak Strength
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VALUE
DOCUMENT ID
TECN
• • • We do not use the following data for averages, fits, limits, etc. • • •
$<20$
1
OLIVE
1981
C
COSM
$<20$
1
STEIGMAN
1979
COSM
1
Limit varies with strength of coupling. See also
WALKER 1991
.
References:
OLIVE
1981C
NP B180 497
Limits on New Superweakly Interacting Particles from Primordial Nucleosynthesis
STEIGMAN
1979
PRL 43 239
Cosmological Constraints on Superweak Particles