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Drops-of-Q t1_jb1gjma wrote

Can you also explain why the age of the universe is dependant on position with the Newtonian gauge?


Aseyhe t1_jb1tjn1 wrote

Gravitational time dilation, due to the -(1+2Φ)dt^2 term in the metric. (In synchronous gauge, that term is just -dt^(2)). The result is that the elapsed time is shortened by a factor of about 1-Φ, where Φ is the Newtonian gravitational potential, of order 10^-6 in our galaxy.