A383267 - OEIS

A383267

Decimal expansion of (4/11)^(1/3).

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

(list; constant; graph; refs; listen; history; text; internal format)

OFFSET

0,1

COMMENTS

In the standard cosmology, the temperature of the free-streaming neutrinos which formed the cosmic neutrino background is (4/11)^(1/3) of the relic photon temperature after the electron-positron annihilation in the early universe (assuming that all electrons and positrons annihilated into photons).

REFERENCES

E. W. Kolb and M. S. Turner, The Early Universe, Addison-Wesley, Redwood City, CA, 1990, p. 503 Appendix A.

R. E. Lopez, S. Dodelson, A. Heckler and M. S. Turner, Precision detection of the cosmic neutrino background, Physical Review Letters 82 (1999) 3952-3955, p. 3952.

Steven Weinberg, Gravitation and Cosmology Principles and Applications of the General Theory of Relativity, John Wiley, New York, 1972, p. 537.

LINKS

Table of n, a(n) for n=0..104.

Wikipedia, Cosmic neutrino background.

Index entries for algebraic numbers, degree 3

FORMULA

Equals 1/A111728 = A005480/A010583.

EXAMPLE

0.713765855503608170671899991762661247590796547589038066915626752084583...

MATHEMATICA

RealDigits[(4/11)^(1/3), 10, 105][[1]] (* Stefano Spezia, Apr 25 2025 *)

PROG