The Sun as a probe of varying G
1994; IOP Publishing; Volume: 437; Linguagem: Inglês
10.1086/175048
ISSN1538-4357
AutoresP. Demarque, Lawrence M. Krauss, D. B. Guenther, David Nydam,
Tópico(s)Scientific Research and Discoveries
Resumoview Abstract Citations (20) References (43) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS The Sun as a Probe of Varying G Demarque, P. ; Krauss, Lawrence M. ; Guenther, D. B. ; Nydam, David 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 beta greater than 0.4 and beta less than -0.4, where G(t) proportional to t-beta over the last 4.5 Gyr. These limits can be tightened to rule out absolute value of beta greater than 0 (0.1) by the use of other solar observables. For nonmonotonic variation in G this suggests that long-timescale variations greater than 0 (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. Publication: The Astrophysical Journal Pub Date: December 1994 DOI: 10.1086/175048 Bibcode: 1994ApJ...437..870D Keywords: Astronomical Models; Big Bang Cosmology; Gravitation Theory; Gravitational Constant; Helioseismology; Solar Flux; Solar Gravitation; Solar Interior; Solar Oscillations; Stellar Evolution; Grand Unified Theory; Gravitational Fields; Luminosity; Nuclear Fusion; Solar Neutrons; String Theory; Solar Physics; GRAVITATION; SUN: FUNDAMENTAL PARAMETERS; SUN: INTERIOR; SUN: OSCILLATIONS full text sources ADS |
Referência(s)