PeterDonis's latest activity

It is implicitly saying that the McVittie solution is globally well-defined--that it has a maximal analytic extension whose Penrose...

Oops, yes, sorry about the mistaken reference.

Again, any such thing will not change the causal structure of the spacetime. Its Penrose diagram will look just like that of FLRW...

I'm not sure the McVittie metric actually has a maximal extension that works the way the paper you reference implies. I note that the...

That's correct. More precisely, in an FLRW universe with zero cosmological constant, it's correct. In fact I'm not even sure if there is...

But it can't be just that, if your other criticism is valid. If it's just statistical conditioning, then there is no actual collapse...

I'm not objecting to any of this, that's not my point. I'm not referring to a case with imperfect/unsharp division event, but rather to...

All of your points are either incorrect or they make no sense.

I agree that, although they are related, they are not the same issue. I'll also focus on what Albert says to make the discussion more...

@rbphysics posting images of equations and text you want to discuss is not permitted. Please post your equations and text directly...

My college experience is several decades old, so I don't know what things are like today. But my experience was that all of the freshman...

But there are lots of institutions other than "top institutions" that give degrees in math and physics. Their graduates might not be the...

I'm not sure that's true. As I said in response to the OP, the university might just expect to spend the student's freshman year...

At the top schools, maybe, but in general this group is smaller than the group of physics bachelor's students. A PhD in non-theoretical...

If I'm understanding this right, up through Grade 10, the math courses you were taking were not AP courses and were not putting you on a...