Sensitivity of solar g-modes to varying G cosmologies
1995; IOP Publishing; Volume: 445; Linguagem: Inglês
10.1086/175680
ISSN1538-4357
AutoresD. B. Guenther, Ken Sills, P. Demarque, Lawrence M. Krauss,
Tópico(s)Cosmology and Gravitation Theories
Resumoview Abstract Citations (9) References (17) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Sensitivity of Solar g-Modes to Varying G Cosmologies Guenther, D. B. ; Sills, Ken ; Demarque, Pierre ; Krauss, Lawrence M. Abstract The sensitivity of the solar g-mode oscillation spectrum to variability in the universal gravitational constant G is described. Solar models in varying G cosmologies were constructed by evolving a zero-age main-sequence stellar model to the Sun's current age, while allowing the value of G to change according to the power law G(t) proportional to t-beta, where Beta approximately equals delta G/GH and H is the Hubble constant. All solar models were constrained to the observed luminosity and radius at the current age of the Sun by adjusting the helium abundance and the mixing-length parameter of the models in the usual way for standard stellar models. Low-l g-mode oscillation periods were calculated for each of the models and compared to the claimed observation of the solar g-mode oscillation spectrum by Hill & Gu (1990). If one accepts Hill & Gu's claims, then within the uncertainties of the physics of the solar model calculation, our models rule out all but (delta G/GH) less than approximately 0.05. In other words, we conclude that G could not have varied by more than 2% over the past 4.5 Gyr, the lifetime of the present-day Sun. This result lends independent support to the validity of the standard solar model. Publication: The Astrophysical Journal Pub Date: May 1995 DOI: 10.1086/175680 Bibcode: 1995ApJ...445..148G Keywords: Abundance; Cosmology; Gravitation Theory; Gravitational Constant; Solar Oscillations; Stellar Evolution; Variability; Gravitational Fields; Nuclear Reactions; Stellar Composition; Stellar Luminosity; Stellar Models; Stellar Temperature; Astrophysics; COSMOLOGY: THEORY; GRAVITATION; SUN: OSCILLATIONS full text sources ADS |
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