A new helioseismic constraint on a cosmic-time variation of G

Understand

Helioseismology can provide strong constraints on the evolution of Newton's constant over cosmic time.

• We make use of the best possible estimate of 8640 days of low-$\ell$ BISON data, corrected for the solar cycle variation, to obtain a new constraint on an evolving gravitational constant.
• In particular, by means of a Bayesian analysis we conclude that ${{\dot{G}/G}_{\rm today}}=(1.25\pm 0.30) \times 10^{-13} \; \mathrm{yr}^{-1}$.
• Our result, a 4-$\sigma$ effect, is more than one order of magnitude stronger than previous constraints obtained with helioseismology.