Monday, June 17, 2019

general relativity - Friedmann Equations with varying G?


If Newton's constant $G$ actually varies with cosmological time $t$ would a suitably modified form of the Einstein field equations:


$$G_{\mu \nu} + \Lambda g_{\mu \nu} = \frac{8 \pi G(t)}{c^4} T_{\mu \nu},$$


together with the standard cosmological assumptions, lead to equations that look like the standard Friedmann equations but with the varying function $G(t)$ in place of the constant $G$?




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