Testing the Constancy of the Gravitational Constant Using Helioseismology

D. B. Guenther, L. M. Krauss, P. Demarque
1998 Astrophysical Journal  
We compare the p-mode oscillation spectra of solar models, constructed under the assumption that the universal gravitation constant G varied monotonically over the course of the solar lifetime, to the most recent solar p-mode frequency observations from the Global Oscillation Network Group (GONG) instrument and Birmingham Solar Oscillation Network (BiSON). The GONG instrument consists of six telescopes spread over di †erent longitude around the Earth, each recording, once every minute, Doppler
more » ... ry minute, Doppler shift images of the SunÏs surface. BiSON also consists of a network of six telescopes speciÐcally designed to observe low-l p-modes. We Ðnd that only those solar models constructed with (1/G)dG/dt ¹ D1.6 ] 10~12 yr~1 are consistent with the observations. This constraint not only probes G over cosmic time, it is stronger by almost one order of magnitude than constraints on the current maximum time variation coming from radar ranging and binary pulsar timing measurements.
doi:10.1086/305567 fatcat:yh5nyshhwjc4dbs3e6zcuizcmi