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Cake day: July 8th, 2023

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  • I mean, we do know that time slows down in a gravitational field . And it speeds up for and fast objects. We have to consider that with our GPS (and similar) satellites. They are basically just atomic clocks sending down their current time. They have already drifted from clocks on the ground by several seconds.

    In terms of time dilation influencing expansion you should look into timescapes. If I recall correctly it is meant to explain the apparently accelerating expansion by time moving faster in emptier regions of space.

    This stuff is just hard to study on a cosmic scale because we don’t know exactly where everything is in the universe. Building a 3d map of all the galaxies is super hard and in parts relies on correct assumptions about expansion.