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

Author

Omar E. Pol, May 28 2013

Keywords

• nonn
• cons

Comments

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...

Examples

			3.39242206416083273234087942036126444137824088551113392562848...
		

Links

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

Formula

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