PeroK's latest activity

Hi. Just joined. Looks like a fun and helpful forum.

I only joined the forum recently, so I couldn't say if it's more or less moderate than in the past. However, I believe that strict...

I think you'll find that He is more expensive than electricity.

You have several misconceptions about entanglement. First, entanglement is often a result of conservation laws and any number of...

I don’t think the improper integral is the issue at all. In some sense, you never need to get there. Intuition suggests that any chosen...

Isn't that just an artifact of the unphysical uniform density assumption? A single massive particle going in circles approaching c...

You can do the paradox without acceleration. Ultimately, therefore, it is about the difference in paths through spacetime. And not...

Note that we can get a similar paradox by considering a length of elastic material that stretches out until instantaneously it has a...

There is such a thing as null dust in the literature. :wink: But it's not intended to cover this kind of case. I think @Demystifier...

You can, but perhaps you can't meaningfully have the boundary of the dust cloud moving at ##c##. In one sense you can, because the...

Dust is not a continuous distribution of matter.

There's an ambiguity over which limit to take first. Even if the physical model is not valid, there's a question over the validity of...

Sure, if you do the integral first and then take the limit as the velocity tends to ##c##. But, if you consider the construction of the...

A one-dimensional ring is fundamentally unphysical. Integration involves the limit of finite rings or annuluses, which is where the...

Consider the outer portion of the disk. For each ##n##, consider the annulus with inner radius ##r_n = R(\frac {n-1}n)##. The mass of...