- #1

elcaro

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- TL;DR Summary
- The Lambda-CDM cosmological models builts on the idea that some (still unknown) physical phenomena (called 'Dark energy') is responsible for the expansion of spacetime and even the relatively recent accelerated exapansion of spacetime. But gravitationally bound objects (solar system, galaxies) do not experience spacetime expansion. So, my question is: is the expansion of spacetime gradual or is there a sharp division between non-expanding and expanding regions of space-time?

I the lambda-CDM model, is the expansion of spacetime uniform around all of spacetime, is there a smooth transition between expanding parts of spacetime (the voids) and non-expanding parts of spacetime, or is there a sharp distinction between expanding and non-expanding parts of spacetime.

Is the gravitational constant (G) the same in all of space, or does it depent on the rate of expansion of spacetime?

Is the gravitational constant (G) the same in all of space, or does it depent on the rate of expansion of spacetime?