3 ms·
Even more fun, once you abandon isotropy you don't even need to posit matter inhomogenities. It could just be that spacetime itself has irregular topology. Whi
by User23 2y ago
Even more fun, once you abandon isotropy you don't even need to posit matter inhomogenities. It could just be that spacetime itself has irregular topology.
Which, incidentally, is probably a better theory than dark matter. For example it can produce the same results without the problem of undetectable matter.
- cryptonector 2y agoPresumably we should be able to build a theory of spacetime that yields no need for dark matter, but we're not there yet. On the other hand, determining the local time dilation factor based on all mass beyond the local area is essentially not possible. We can talk about how the great voids have less time dilation than galaxy clusters, sure. But what about the universe as a whole? Our universe could be embedded in a larger one that contributes to time dilation in ours and we could never sense that. Time dilation at cosmological scales is relative for this reason.