Roberto Pavani's latest activity
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Roberto Pavani posted the thread Graduate Electron mass without B-field: best precision? in Electromagnetism.The CODATA value of ##e/m_e## comes from Penning-trap cyclotron frequency measurements (strong ##B## field). Are there any competitive... -
Roberto Pavani replied to the thread High School A question about special relativity.A.T. gave an excellent answer in post #2, but perhaps the original question was even simpler than we made it: if a clock moves fast...
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Roberto Pavani reacted to A.T.'s post in the thread High School A question about special relativity with
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It should be noted that no matter what the axis of the local motion in the rocket is, over an entire local motion cycle it is slowed by... -
Roberto Pavani reacted to ohwilleke's post in the thread Undergrad New muon g-2 calculation consistent with experiment with Like.
The updated BMW calculation of the hadronic vacuum polarization contribution to the muon anomalous magnetic moment aμ in the Standard...
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Roberto Pavani replied to the thread Graduate Magnetic monopole vs (g-2).Thank you @renormalize, that's exactly the reference I was looking for. The Vento & Lacroix paper confirms that virtual...
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Roberto Pavani reacted to renormalize's post in the thread Graduate Magnetic monopole vs (g-2) with Like.
Closed loops of virtual low-mass magnetic monopoles would modify the QED prediction of ##g-2## for the electron and muon. @Roberto...
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While working on a preprint, I noticed what seems to be a straightforward logical chain that I haven't seen stated explicitly in the...
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Roberto Pavani replied to the thread Graduate Is Energy conservation among sectors (EM,GR,QM) a principle?.After some further research, I think I found one possible answer to my own question: Chamseddine & Connes (2007/2008). They derive the...
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Roberto Pavani replied to the thread Graduate Is Energy conservation among sectors (EM,GR,QM) a principle?.For those interested, the programmes I had in mind are: emergent spacetime (Barceló, Liberati, Visser), twistor theory (Penrose)...
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Roberto Pavani replied to the thread Graduate Is Energy conservation among sectors (EM,GR,QM) a principle?.@Dale Your questions about the interaction terms are exactly my point: "Is it true that actions are simply added across sectors?"...
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Roberto Pavani replied to the thread Graduate Is Energy conservation among sectors (EM,GR,QM) a principle?.@renormalize I agree that "Nature obeys the Principle of Least Action" is a valid starting point. But even granting that, the *form* of...
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Roberto Pavani replied to the thread Graduate Is Energy conservation among sectors (EM,GR,QM) a principle?.The connection is this: energy conservation was an empirical discovery long before we had Lagrangians. When we formalized it via...
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Roberto Pavani replied to the thread Graduate Is Energy conservation among sectors (EM,GR,QM) a principle?.I agree with you all. Let me clarify what I mean: I'm not questioning that energy is conserved. Noether's theorem guarantees that...
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Roberto Pavani replied to the thread Graduate Is Energy conservation among sectors (EM,GR,QM) a principle?.Each sector separately has time-translation symmetry and its own conserved energy. The fact that energy can flow between sectors while...
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Roberto Pavani replied to the thread Graduate Is Energy conservation among sectors (EM,GR,QM) a principle?.Noether's theorem states that every continuous symmetry of the action of a physical system with conservative forces has a corresponding...