Nugatory's latest activity
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Nugatory replied to the thread I Intuitive look at bending of light by gravity.Factors of ##c^2## generally obscure the underlying physics and get in the way of intuitive understanding. They go away when we set... -
Nugatory replied to the thread B Feynman QED Questions.My copy of the book doesn't have a figure 24c.
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Nugatory replied to the thread B Feynman QED Questions.Which Feynman book/paper/lecture are you working from? Until you tell us that, we won’t know what’s in the figures that you’re asking...
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Nugatory replied to the thread Generating Artificial Gravity in Spaceships.That is not what this forum is for - please take a look at the forum mission statement in the rules. This thread is closed.
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Nugatory replied to the thread I More information on the momentum eigenstate in the position basis.The text inside a ket is merely a label, so in general we need to know what convention is being used to assign labels to know what is...
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Nugatory replied to the thread B Warp drive research of Prof David Pares.It would be a lot more exciting if it were not total nonsense (Sorry, but you did ask for our thoughts, and that's what they are). This...
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Nugatory reacted to PAllen's post in the thread A Covariant form of Maxwell's (inhomogeneous) equations (in GR) with
Like.
The main discussion is in and around box 16.1, p. 390 of my edition. -
Nugatory reacted to PeterDonis's post in the thread A Covariant form of Maxwell's (inhomogeneous) equations (in GR) with Like.
Sections 16.2 and 16.3. The latter section and the accompanying Box 16.1 specifically discuss the case of electrodynamics.
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Nugatory reacted to div_grad's post in the thread A Magnetic field produced by moving charge in operator form with Like.
In non-relativistic quantum mechanics based on the Schrödinger equation, you can only consider the electromagnetic fields as external...
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Nugatory replied to the thread I Does kinetic friction propel a person walking forward?.You’ve left a force out of that diagram: the force of the skater’s leg pushing the foot backwards, against the dynamic friction. If...
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##E## is the kinetic energy total energy per kilogram at infinity - i.e. the kinetic energy you have out in deep space plus your rest...
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Nugatory replied to the thread B Oberth Effect Near Sag A*.The definition of ##\gamma## is right there in the post: ##\frac{dt}{d\tau} = \gamma##. The Lorentz factor from special relativity is...