PeterDonis's latest activity

I think the difference here is that time dilation in SR is not an observable--it's something that's calculated by assuming a particular...

What has/has not been proven by the singularity theorems, yes. But the calculations that show that in specific solutions, such as the...

Not necessarily. Note that your reference says "typically", not "always". What "typically" appears to mean is "in black hole solutions...

Which doesn't matter, because for black hole solutions (the Kerr-Newman family of solutions), we don't use the singularity theorems to...

Umm, that is what destroys things. The tidal forces grow without bound. Any object composed of multiple fundamental particles will have...

Trying to understand why ##a^0 = 1## by using the positive-integer interpretation ##a \times a \times a \times \cdots## is the wrong...

Exactly. So you want "multiply by no ##a##s" to be "multiply by 1".

I guess the rationale is this: Start with ##0##, add ##a## you get ##a##. Add ##a## again you get ##2a##. In this case you start with...

Exponents are about multiplication, and 1 is the multiplicative identity. If exponents represented repeated addition the zeroeth power...

At PF, we've had questions about black holes in a number of forums. This particular question, since it's really about the basic...

It's not an assumption; it's a conclusion based on what the mathematical model tells you. The mathematical model tells you that once...

All interpretations make the same predictions as "textbook quantum mechanics". Things that don't make the same predictions aren't...

After moderator review, the thread will remain closed. Thanks to all who participated.

Of which, IIRC, Bell said that he could not imagine an interpretation that Einstein would have liked less. Bohmian mechanics doesn't...

Not in the gravitational redshift case, since the observers are at mutual rest in that case--at least by the only definition of "mutual...