That is a good question. The energy density of space-time, is always measured to be the same locally, only marginally less that matter. This constant density results in the constant speed of light locally.However this density is relatively different depending on the local curvature of...
We see X. Where X = gravitational effects on space-time in turn effecting matter and light. We know that matter can have this effect on space-time. But am I wrong or we really don't really understand what makes up space-time, and why massive objects cause it to bend?
Its clear that space time is not constant density, hence the variance of gravitational effects that have resulted in galaxy clusters.
Yes I am aware of the multiple ways gravitational effects can manifest itself, but what are referring to is how these gravitational effects result in the...
Good question. But seriously if the known universe existed solely in the form of a singularity and that singularity had a S=0 point in time then a "pre-universe' would be an S-minus timeline.
But isn't it true we only are seeing gravitational effects on space-time and not DM actually behaving like matter? I would agree the first assumption to make is that it is an effect caused by a form of matter we can't interact with. But that should not be the end point. Dark Matter may turn...
I'm not sure we are clear that DM clumps around galaxy clusters. It would make more sense that matter (galaxy clusters) tends to clump around regions of space-time where "dark matter" is more prevalent?
Labeling an unknown gravitational phenomena a form of matter, tends to narrow one's thinking about the problem, and put it in a box. Does it not? We haven't had to contend with an potential alternate theory of gravity until the confirmation that the effects of "dark matter" exist.
Why? We don't even know if dark matter is matter at all? We assume it is because we see gravitational effects in space-time. But that only matter can cause gravitational effects in space-time is itself an assumption.