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PeterDonis's latest activity
PeterDonis
replied to the thread
A
Resolution of the Frauchiger-Renner paradox
.
Which, if the F-R scenario is possible, we cannot trust. That's the point I have been making. It is no answer to this to argue based on...
Today, 9:09 AM
PeterDonis
reacted to
OmCheeto's post
in the thread
Baltimore's Francis Scott Key Bridge Collapses after Ship Strike
with
Like
.
As a former maritime electrical operator, I'd love to hear the story from the electricians point of view. And no holds barred on the...
Yesterday, 11:07 PM
PeterDonis
replied to the thread
A
Resolution of the Frauchiger-Renner paradox
.
But on what basis are you assuming this? If such scenarios are possible at all, we cannot say anything about their unlikelihood based on...
Yesterday, 10:20 PM
PeterDonis
replied to the thread
A
Resolution of the Frauchiger-Renner paradox
.
It's one thing to make an abstract philosophical observation about the limits of our ability as humans to have confidence in our...
Yesterday, 10:10 PM
PeterDonis
replied to the thread
B
How to intuitively understand the formula S² = x² - c²t²
.
That is a good source, yes. "An online video" is not. Stick with the book. Know what in advance? That the formula exists and is used in...
Yesterday, 1:58 PM
PeterDonis
replied to the thread
B
Does energy exist?
.
The OP question has been sufficiently addressed. Thread closed. (Thread also moved to Other Physics Topics as that seems to be the best...
Yesterday, 1:55 PM
PeterDonis
replied to the thread
I
I want a good reference to a discussion of the meaning of "the speed of light is constant"
.
You keep restating the same thing.
Yesterday, 1:49 PM
PeterDonis
replied to the thread
I
Why isn't TT gauge over constrained?
.
Btw, I'm not sure this constraint actually gives you "longitudinal gauge". The equation ##A_{\mu 0} = 0## is satisfied by...
Yesterday, 1:45 PM
PeterDonis
replied to the thread
I
Why isn't TT gauge over constrained?
.
Which involves imposing 4 conditions, to remove 4 degrees of freedom. Yes. One of them is tracelessness, and the other three are to...
Yesterday, 1:41 PM
PeterDonis
replied to the thread
I
I want a good reference to a discussion of the meaning of "the speed of light is constant"
.
Yes. Yes, but there are an infinite number of possible definitions that meet that restriction.
Yesterday, 12:45 PM
PeterDonis
replied to the thread
I
I want a good reference to a discussion of the meaning of "the speed of light is constant"
.
No, that's not the point. One can conclude that the "distance" stays unchanged from the fact that the round-trip light travel time is...
Yesterday, 12:07 PM
PeterDonis
replied to the thread
I
I want a good reference to a discussion of the meaning of "the speed of light is constant"
.
In general at most one can possibly be.
Yesterday, 11:48 AM
PeterDonis
replied to the thread
I
Single slit diffraction
.
Where? Please give a specific reference.
Yesterday, 11:16 AM
PeterDonis
replied to the thread
I
I want a good reference to a discussion of the meaning of "the speed of light is constant"
.
Yes, but in general such timelike worldlines will not be geodesics in a curved spacetime. Yes.
Yesterday, 11:15 AM
PeterDonis
replied to the thread
I
Why isn't TT gauge over constrained?
.
Wouldn't you want to form a transverse gauge? Transverse traceless is the usual way of reducing to the 2 physical degrees of freedom...
Yesterday, 11:07 AM
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