- #36

PeterDonis

Mentor

- 47,189

- 23,544

We're not comparing their "realities". They both live in the same reality. In that one reality, the length of the paths that Alice and Bob take through spacetime are different; that is what "different elapsed times" means.Mikael17 said:which parameter is what changes in a gravitational field if youcompareBob's and Alice's reality

Yes, good, you've got it. Except--Mikael17 said:We know that Alice's clock ticks slowing . We knowdis the same,

No, the "only possibility" is thatMikael17 said:The only possibility is therefore purely mathematical that m (the ruler) must also be a relative variable?

*Alice's clock runs slow*, just as you

*already said*in the quote above.