The sun as a probe of varying G

P. Demarque, Lawrence Krauss, D. B. Guenther, David Nydam

Research output: Contribution to journalArticle

15 Citations (Scopus)

Abstract

In order to explore the ability of helioseismology and features of solar models to test the constancy of the gravitational constant G during the last 4.5 Gyr of solar evolution, we have constructed a grid of evolutionary sequences for solar models under the assumptions that G varies with time, and have explored the sensitivity of their nonradial acoustic mode oscillation spectra to G variability. All final models satisfy the standard constraints for the present Sun and, except for the variation in G, were constructed under the assumptions of a standard solar model. When compared with the observed solar p-mode spectrum, our models definitely rule out β > 0.4 and β < -0.4, where G(t) ∝ t over the last 4.5 Gyr. These limits can be tightened to rule out |β| > O(0.1) by the use of other solar observables. For nonmonotonic variation in G this suggests that longtimescale variations greater than O(5%) in G are ruled out over the last 4.5 Gyr. Future prospects for improving the sensitivity of helioseismic tests of a varying G are also discussed. Finally, we explore the sensitivity of the predicted solar neutrino flux to varying G.

Original languageEnglish (US)
Pages (from-to)870-878
Number of pages9
JournalAstrophysical Journal
Volume437
Issue number2
StatePublished - Dec 20 1994
Externally publishedYes

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sun
probe
probes
sensitivity
gravitational constant
helioseismology
constancy
future prospect
solar neutrinos
acoustics
oscillation
grids
oscillations
test

Keywords

  • Gravitation
  • Sun: fundamental parameters
  • Sun: interior
  • Sun: oscillations

ASJC Scopus subject areas

  • Space and Planetary Science

Cite this

Demarque, P., Krauss, L., Guenther, D. B., & Nydam, D. (1994). The sun as a probe of varying G. Astrophysical Journal, 437(2), 870-878.

The sun as a probe of varying G. / Demarque, P.; Krauss, Lawrence; Guenther, D. B.; Nydam, David.

In: Astrophysical Journal, Vol. 437, No. 2, 20.12.1994, p. 870-878.

Research output: Contribution to journalArticle

Demarque, P, Krauss, L, Guenther, DB & Nydam, D 1994, 'The sun as a probe of varying G', Astrophysical Journal, vol. 437, no. 2, pp. 870-878.
Demarque P, Krauss L, Guenther DB, Nydam D. The sun as a probe of varying G. Astrophysical Journal. 1994 Dec 20;437(2):870-878.
Demarque, P. ; Krauss, Lawrence ; Guenther, D. B. ; Nydam, David. / The sun as a probe of varying G. In: Astrophysical Journal. 1994 ; Vol. 437, No. 2. pp. 870-878.
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