Recent content by Nugatory

Your hypothetical “electrop”differs from the positron (the electron’s anti-particle, and not hypothetical) only in that it doesn’t interact with electrons? They would form bound pairs with electrons (like positronium, but stable), these pairs would be neutral, and now we don’t have charge...

We aren't. We are analyzing the forces acting on a given infinitesimal volume somewhere along the rod, and these are all external to that volume. You might find it easier to understand if you consider two weights connected by an idealized massless string, rotaing with the weights orbiting the...

Any time you run into a paradox, your first thought should be that you have taken a wrong turn on the way there. You have started from "Imagine the universe has an edge, and outside that edge there is true nothing" and arrived at a contradiction. That is a fairly strong hint that your starting...

Many legal documents do that. At the beginning of most of my insurance policies there is a section of definitions, stuff like “PERMITTED DRIVER means ….” and throughout the document the term is capitalized to indicate that that is exactly what is intended.

If this is intended as a "random thought" - and yes, it does qualify as such - what's going on here is that the word "variable" means something different to mathematicians and computer programmers. That's not a problem with either the mathematicians or the software people, it's an example of...

@Green dwarf did we not go through all of this with you ten years ago? https://www.physicsforums.com/threads/where-is-the-matter-in-a-black-hole.836527/

Whether mainstream or not, Physics Forums is not intended for prepublication review or initial presentation of new work. This policy and the reasons for it are discussed in the forum rules and many older discussions in the forum feedback section.

There's not much point in proposing a greek letter for us in describing multiverses when the multiverse notion is an idle speculation that is no part of any serious physical theory and cannot even in principle have any observational consequences. This threaad is closed, and anyone coming across...

Most relativity "paradoxes" are better described as "apparent contradiction resulting from a hidden bogus assumption, often used as a pedagogical device to help students recognize bogus assumptions". By that definition, yes, it is a paradox. But.... This assumes that when the train augurs in...

Sure, if you assume the simuulation hypothesis then anything is possible; the master software developer just has to hack together a few lines of code to make something that is impossible under the laws of physics possible. All science is meaningless, because any experimental result can be...

With tongue somewhat in cheek, I've said that I used my undergraduate physics degree the way that a male peacock uses its tail feathers: The peacock is displaying the feathers as a proxy for reproductive fitness and I was displaying the degree as a proxy for knowing how to apply math to hard...

Enough so that we have a live report against them.... A flood of low quality low information posts from an account started 18 hours ago.

It is not impossible that more years (decades?) of AI development will lead to conscious physical systems In which the underlying physics is well understood. We may be perplexed by the emergent behavior of a system of, say, ##10^{15}## transistors, but we would not doubt that we understand the...

If it is at rest in the center of mass frame and we have arranged for a fully inelastic collision to happen inside it?

This is tricky even without introducing the complexities of an evaporating black hole. "Crosses the horizon at a finite proper time ##\tau_1##" doesn't make sense unless and until we specify the point on the infaller's worldline where the proper time has been arbitrarily considered to be zero...