Roberto Pavani's latest activity
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Roberto Pavani replied to the thread Graduate Is photon frequency intrinsic or observer-dependent?.One more observation: if both photons from an ##e^+e^-## annihilation are null (##k^\mu k_\mu = 0## each), but their sum is timelike... -
Roberto Pavani reacted to Sagittarius A-Star's post in the thread Graduate Is photon frequency intrinsic or observer-dependent? with
Like.
Yes, because it is massless. -
Roberto Pavani replied to the thread Graduate Is photon frequency intrinsic or observer-dependent?.Thanks for the replies. A follow-up: if frequency is observer-dependent, and ##E = h\nu##, then the photon's energy is also...
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Roberto Pavani reacted to Dale's post in the thread Graduate Is photon frequency intrinsic or observer-dependent? with Like.
Nothing.
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Roberto Pavani posted the thread Graduate Is photon frequency intrinsic or observer-dependent? in Special and General Relativity.In GR, the frequency of a photon is observer-dependent: ##\nu = g_{\mu\nu} k^\mu u^\nu##, where ##k^\mu## is the photon 4-momentum and...
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Roberto Pavani replied to the thread Graduate Time evolution of a detected particle.I think there is a distinction between the mathematical model and the physical system. Once we start asking what materials the box is...
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Roberto Pavani reacted to PeterDonis's post in the thread Graduate Time evolution of a detected particle with Like.
If the potential in the box walls has only a finite width, yes.
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Roberto Pavani replied to the thread Graduate Time evolution of a detected particle.Or just tunneling away
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Roberto Pavani replied to the thread Undergrad Single-photon double-slit with multiple apparatus?.True, but a fast optical shutter can provide a good approximation by defining when photons are allowed into the apparatus. The only...
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Roberto Pavani reacted to PeterDonis's post in the thread Undergrad Single-photon double-slit with multiple apparatus? with Like.
Note that we don't have light sources that allow us to control when a photon is emitted. The best we can do is to turn down the...
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Roberto Pavani replied to the thread High School Just a cool high school problem.Short explanation of my calculation in #11: Ignoring the trivial vertical case, I considered a particle at height h on the wheel. At...
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Roberto Pavani replied to the thread High School Just a cool high school problem.Correction: I had initially visualized a wheel translating upward while rotating. Re-reading the statement, the center is fixed and the...
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Roberto Pavani replied to the thread High School Just a cool high school problem.Nice problem. The clean way to solve the problem is to use an inertial reference frame whose origin is the center of the wheel. This...
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Roberto Pavani reacted to Matterwave's post in the thread Is A.I. more than the sum of its parts? with Like.
That mathematically looks identical to Boltzmann's canonical distribution (hence the terminology "Temperature") :D (assuming no...
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Roberto Pavani replied to the thread Undergrad Single-photon double-slit with multiple apparatus?.The OP seems to be arguing that a single-photon experiment shows that simultaneous photon-photon interference is not required. However...