PeterDonis's latest activity
-
PeterDonis replied to the thread A Physical properties of the vacuum in GR vs. QFT.That would be the best way, yes. That's something that has been attempted multiple times, but nobody has yet succeeded. If it could be... -
PeterDonis reacted to Dale's post in the thread A Is the constancy of c a postulate or a derivable theorem? with
Like.
An alternative approach is to just write the most general affine transformation between inertial frames and determine the coefficients... -
PeterDonis replied to the thread I Understanding the historical shift away from absolute simultaneity.It can't be since it makes all of the same experimental predictions as standard SR. I would say the choice isn't really a matter of...
-
PeterDonis replied to the thread A Physical properties of the vacuum in GR vs. QFT.Of course these sorts of speculations have been made. The problem is, nobody has yet come up with a theoretical model that incorporates...
-
PeterDonis replied to the thread A Is there any topology behind factor 2 in Schwarzschild radius?.The appearances of ##G## can be traced back to the EFE, yes. But that means that any attempt to redefine ##G## needs to take into...
-
PeterDonis replied to the thread A Is there any topology behind factor 2 in Schwarzschild radius?.The usual convention is ##\kappa = G / c^4## (or sometimes ##G / c^2##, depending on whether you prefer mass or energy units for the...
-
PeterDonis reacted to Ibix's post in the thread I Understanding the historical shift away from absolute simultaneity with Like.
Other experiments. The pre-1905 section of the SR experimental basis FAQ (linked in this sticky thread at the top of the forum)...
-
PeterDonis replied to the thread A Is there any topology behind factor 2 in Schwarzschild radius?.Its significance is geometric: the area of the horizon of a Schwarzschild black hole is ##4 \pi R_s^2 = 16 \pi G^2 M^2 / c^4## if we use...
-
PeterDonis replied to the thread A Is there any topology behind factor 2 in Schwarzschild radius?.No, you can't, because ##G## (or ##8 \pi G / c^4##, or whatever units you choose for it) shows up in a lot of places other than the...
-
PeterDonis reacted to Demystifier's post in the thread I Conventionality of the One-Way Speed of Light with Like.
The Einstein synchronization convention is just that - a convention. Physics does not depend on conventions. Various synchronization...
-
PeterDonis replied to the thread A Physical properties of the vacuum in GR vs. QFT.There's another line of research that might be relevant to what the OP was asking about. There was a line of research in, IIRC, the...
-
PeterDonis replied to the thread A Physical properties of the vacuum in GR vs. QFT.Currently we don't have a good reconciliation of this. The best that we have is QFT in curved spacetime, but that's still not a complete...
-
PeterDonis replied to the thread A Inertial mass, the Higgs field, and Mach's Principle.Yes. Only in the sense that "the vacuum structure" has the fact that spacetime is locally Minkowskian built into it, and that embodies...
-
PeterDonis reacted to Demystifier's post in the thread I Transformation for Lemaitre coordinates with Like.
More generally, for two system of coordinates ##x## and ##y##, one has ##x^{\mu}=f^{\mu}(y)##, so $$dx^{\mu}=f^{\mu}_{,\nu}(y)dy^{\nu}$$...
-
PeterDonis replied to the thread I Transformation for Lemaitre coordinates.This will be true in general for any transformation between the Schwarzschild chart and a chart that doesn't have a coordinate...