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renormalize's latest activity
R
renormalize
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I
Researchers finds experimental evidence for a graviton-like particle
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A graviton would bear the same relation to a classical gravitational wave as the photon does to a classical electromagnetic wave.
Yesterday, 3:58 PM
R
renormalize
replied to the thread
Collection of Lame Jokes
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Yesterday, 2:42 PM
R
renormalize
replied to the thread
A
Horndeski: denominator null implies an infinite quantity
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Actually, the contravariant index ##\lambda^{\prime}## appears on both sides of eq.(4.2.6), so it doesn't "disappear". I think what...
Yesterday, 11:47 AM
R
renormalize
replied to the thread
A
Horndeski: denominator null implies an infinite quantity
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I disagree. Consider the Lagrangian ##\mathcal{L}\left(A_{\alpha},\partial_{\beta}A_{\alpha}\right)## for the electromagnetic potential...
Sunday, 10:28 PM
R
renormalize
replied to the thread
A
Horndeski: denominator null implies an infinite quantity
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Thanks, but I am familiar with the comma notation for partial derivatives with respect to coordinates ##x##. What I'm trying to...
Sunday, 6:28 PM
R
renormalize
replied to the thread
B
E-field of a constant velocity charged particle
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Since the 1s ground state of the hydrogen atom is spherically-symmetric, can you tell us in which direction this electric field points?
Sunday, 4:16 PM
R
renormalize
replied to the thread
A
Horndeski: denominator null implies an infinite quantity
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Since I don't understand the notation I can't address your issue. But I can tell you that what you wrote is not a valid tensor equation...
Sunday, 4:11 PM
R
renormalize
replied to the thread
Normalising the wavefunction - two answers
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No, that's not right. In the notation of your original...
Sunday, 3:59 PM
R
renormalize
replied to the thread
Normalising the wavefunction - two answers
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Yes, that's because ##\phi## is an arbitrary parameter that is not physically measurable. It can be set to ##\phi =0 \Rightarrow A=1##...
Sunday, 2:23 PM
R
renormalize
replied to the thread
A
Horndeski: denominator null implies an infinite quantity
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1) The left side of your equation has two free unprimed indices ##\mu \nu## but the right has three ##\mu \nu \lambda##. Can you...
Sunday, 10:12 AM
R
renormalize
reacted to
diracs-cat's post
in the thread
Covariant Euler-Lagrange Computation
with
Like
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That worked great, thanks!
Saturday, 9:06 PM
R
renormalize
replied to the thread
Covariant Euler-Lagrange Computation
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You've probably already done this: SetOptions[ContractMetric, AllowUpperDerivatives -> True]. In addition, you can remove as many...
Saturday, 7:42 PM
R
renormalize
reacted to
Ibix's post
in the thread
I
Train Tunnel Paradox Question
with
Like
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I'm not totally clear what scenario you are considering. I've drawn a few spacetime diagrams for one that's something like it, which...
Saturday, 3:57 PM
R
renormalize
replied to the thread
B
E-field of a constant velocity charged particle
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What does your graph tell us that's not conveyed by the standard depiction of the electric field of a moving charge? (from J.D...
Saturday, 1:35 PM
R
renormalize
replied to the thread
How is Physics taught without Calculus?
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Well, an approximate "product rule" doesn't really require calculus. It falls out directly for small finite-differences:$$\Delta x^2...
Saturday, 3:53 AM
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