最終更新日：2022/12/24
Due to its effect on the expansion rate of the Universe during Big Bang nucleosynthesis (BBN), the theoretical expectations for the primordial abundances of light elements depend on N_ν. Astrophysical measurements of the primordial ⁴He and ²D abundances lead to a value of N_ν = 3.14_-0.65 at 68% c.l., in very good agreement with the Standard Model expectation.
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Due
to
its
effect
on
the
expansion
rate
of
the
Universe
during
Big
Bang
nucleosynthesis
(BBN),
the
theoretical
expectations
for
the
primordial
abundances
of
light
elements
depend
on
N_ν.
Astrophysical
measurements
of
the
primordial
⁴He
and
²D
abundances
lead
to
a
value
of
N_ν
=
3.14_-0.65
at
68%
c.l.,
in
very
good
agreement
with
the
Standard
Model
expectation.
