Dale's latest activity
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Dale replied to the thread I Coulomb gauge implies instantaneous radial electric field?.This is shown in Jackson's 2002 paper "From Lorenz to Coulomb and other explicit gauge transformations" (Am J Phys, 35:832-837)... -
That's not what I said. What I said is that, if you're observing from a distance objects that are at rest fairly close to a black hole's...
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Some additional cautions may be stated: A paper so oriented is not inertial, so you have to imagine some force holding it in place...
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Dale reacted to QuarkyMeson's post in the thread I Coulomb gauge implies instantaneous radial electric field? with
Like.
Longitudinal electric field isn't an observable, E is. (Save some electrostatic near field stuff when E is approx ##E_{\parallel}## and... -
Dale replied to the thread I Coulomb gauge implies instantaneous radial electric field?.As was pointed out by @QuarkyMeson, no, because it is only part of the field. However, Maxwell’s equations admit causality-reversed...
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Dale reacted to Borg's post in the thread Medical New Alzheimer's Treatment Clears Plaques From Brains of Mice Within Hours with Like.
Agree 100%. Even if it fast-tracked, it would be years before it becomes an available treatment. But, if it pans out, it would help...
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Dale reacted to Borg's post in the thread Medical New Alzheimer's Treatment Clears Plaques From Brains of Mice Within Hours with Like.
I've been reading a bunch of articles in this month's Scientific American on Alzheimer's and ran across this article in a web feed that...
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Dale replied to the thread Medical New Alzheimer's Treatment Clears Plaques From Brains of Mice Within Hours.The paper does look very promising. However, it is good to be mindful of the huge pile of promising treatments that have died on this...
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Dale replied to the thread B The Effect of Linear and Rotational Motion on Measured Weight.That was my thought too. Classically, no. The total mass is unchanged, as is the acceleration of the center of mass. So the net force is...
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Dale reacted to Ibix's post in the thread B The Effect of Linear and Rotational Motion on Measured Weight with Like.
Actually, if the car is moving in a straight line (or, to be precise, has its steering straight at all times) on Earth I think its...
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Dale replied to the thread I The wave equation interpretation of special relativity.I would assume that every author who writes any explanation of length contraction considers their explanation to be a good one...
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Dale replied to the thread I The wave equation interpretation of special relativity.One issue is that length contraction is not a shrinking, but a disagreement. In other words, length contraction occurs even if the...
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Dale replied to the thread I The wave equation interpretation of special relativity.@gentzen I have removed your rather lengthy complaint about moderation actions. Such complaints should be posted to the feedback forum...
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Dale reacted to PeterDonis's post in the thread B Is there a white hole inside every black hole? with Like.
That's correct. More precisely, in an FLRW universe with zero cosmological constant, it's correct. In fact I'm not even sure if there is...
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Dale reacted to Ibix's post in the thread B Is there a white hole inside every black hole? with Like.
I'm not sure you can even have true black holes in an FLRW universe, because a black hole is a region of spacetime that can't signal to...