A005600 Decimal expansion of reciprocal of fine-structure constant alpha. (Formerly M2606)

1, 3, 7, 0, 3, 5, 9, 9, 9

Offset

3,2

Comments

The fine-structure "constant" actually isn't a constant, it depends on the energy at which it is measured: Its value is known to approach 1/128 at interaction energies above 80 GeV. For other considerations, e.g., whether the value of the fine-structure constant differs by location and over time, see the Wikipedia article or other links. - M. F. Hasler, Oct 30 2013

References

John Barrow, The Constants of Nature, 367 pp., Jonathan Cape, 2002.

K. R. Lang, Astrophysical Data: Planets and Stars, Springer-Verlag, NY, 1991.

Martin J. Rees, Just Six Numbers: the deep forces that shape the universe, Phoenix, 1999.

N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).

Links

Table of n, a(n) for n=3..11.

E. R. Cohen and B. N. Taylor, The 1986 adjustment of the fundamental physical constants, Rev. Modern Phys., 59 (1987), 1121-1148.

Morel, L., Yao, Z., Cladé, P. et al. Determination of the fine-structure constant with an accuracy of 81 parts per trillion. Nature 588, 61-65 (2020). doi:10.1038/s41586-020-2964-7

Robert P. Munafo, Notable Properties of Specific Numbers.

NIST, inverse fine-structure constant

Wikipedia, Fine-structure constant

Formula

1/alpha = 1/A003673.

1/alpha = c/V_n1 = A003678/A081800. - Omar E. Pol, Mar 11 2018

Example

1/alpha = 137.035999206(11) [Morel et al., 2020]

Crossrefs

Cf. A003673, A082726.

Sequence in context: A127584 A124919 A033920 * A180873 A021031 A291835

Adjacent sequences: A005597 A005598 A005599 * A005601 A005602 A005603

Keyword

cons,nonn

Author

N. J. A. Sloane, Mira Bernstein

Extensions

Updated May 20 2003

Updated by Omar E. Pol, Aug 09 2009

Updated by Raphie Frank, Dec 13 2012

Updated by Arkadiusz Wesolowski, Feb 08 2016

Updated by Rémy Sigrist, Dec 05 2020

Dropped the digits that could change with 1 standard error variation of the value provided by CODATA - Andrey Zabolotskiy, Dec 12 2020

Status

approved