A225357 -id:A225357 - cp's OEIS frontend

A225359 Decimal expansion of suggested value for N_eff: the effective number of neutrino species present in the era before recombination.

3, 3, 9, 2, 4, 2, 2, 0, 6, 4, 1, 6, 0, 8, 3, 2, 7, 3, 2, 3, 4, 0, 8, 7, 9, 4, 2, 0, 3, 6, 1, 2, 6, 4, 4, 4, 1, 3, 7, 8, 2, 4, 0, 8, 8, 5, 5, 1, 1, 1, 3, 3, 9, 2, 5, 6, 2, 8, 4, 8, 8, 6, 5, 4, 9, 9, 5, 4, 8, 1, 9, 9, 0, 2, 7, 3, 3, 1, 4, 8, 7, 2, 7, 0, 0, 1, 6, 0, 8, 5, 8, 7, 3, 5, 2, 9, 8, 5, 0, 1, 0, 6, 9, 3, 6

Offset: 1

Omar E. Pol, May 28 2013

Decimal expansion of (3 + (4/7)*(43/57)^(4/3) = 3 + 172*(43/57)^(1/3)/399).

Steven Weinberg suggested that the contribution from Goldstone bosons to the effective number of neutrino species present in the era before recombination would be (4/7)*(43/57)^(4/3) = 0.392422..., so N_eff should be 3 + (4/7)*(43/57)^(4/3) = 3.392422...

			3.39242206416083273234087942036126444137824088551113392562848...

Steven Weinberg, Goldstone bosons as fractional cosmic neutrinos
Wikipedia, Neutrino

3 + (4/7)*(43/57)^(4/3) = 3+A225357.

cp's OEIS Frontend

A225359 Decimal expansion of suggested value for N_eff: the effective number of neutrino species present in the era before recombination.

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