Roberto Pavani's latest activity
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Roberto Pavani reacted to berkeman's post in the thread Undergrad Our Mathematical Universe book -- Since when does light contain voltage? with
Like.
Light waves have E and B components. The oscillating E-field component is what accelerates electrons in antennas and other metal... -
Roberto Pavani replied to the thread Graduate Universal quantum physics.Does your interpretation require any geometric substrate, or does it work regardless; i.e., no substrate needed at all?
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Roberto Pavani reacted to Demystifier's post in the thread Undergrad Gravity at large scales: force hierarchy or charge cancellation? with Like.
You correctly explained why gravity is dominant at cosmological scales, but the hierarchy problem is not about the cosmological scales...
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Roberto Pavani reacted to Demystifier's post in the thread Undergrad Why is gravity a fictitious force? with Like.
Gravity, of course, is not fictitious because the Riemann curvature is a tensor. But gravity is not the same thing as gravitational...
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Roberto Pavani replied to the thread Undergrad Why is gravity a fictitious force?.Fair point. I should have said 'gravitational force', not 'gravity'. The distinction is precisely the one between Christoffel symbols...
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Roberto Pavani replied to the thread Undergrad Gravity at large scales: force hierarchy or charge cancellation?.You're right, I misused the term 'hierarchy problem', that's about the coupling constants in the action, not about cosmological...
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Roberto Pavani replied to the thread Undergrad Why is gravity a fictitious force?.@Demystifier's observation kept buzzing in my head and produced the following thought: Gravity is fictitious only to first order. In...
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Roberto Pavani posted the thread Undergrad Gravity at large scales: force hierarchy or charge cancellation? in Beyond the Standard Models.We know that gravity is much weaker than electromagnetism at the particle level (~10⁻³⁶ ratio). Yet gravity is the dominant interaction...
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Roberto Pavani replied to the thread Undergrad What is matter?.Undergraduate answer to an undergraduate question: matter is anything that has inertial mass, i.e., anything that resists acceleration...
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Roberto Pavani replied to the thread Undergrad Mach's principle vs two counter-rotating buckets.No personal theory needed. My argument rests on one principle: all observers must agree on physical events. The water being on the...
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Roberto Pavani replied to the thread Undergrad Mach's principle vs two counter-rotating buckets.You're right that coordinate velocities in rotating frames can exceed ##c##, that's just a coordinate artifact. But Mach's principle...
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Roberto Pavani replied to the thread Undergrad Mach's principle vs two counter-rotating buckets.That would be assuming Mach's principle to defend Mach's principle, seems circular. Moreover, GR is built on the equivalence principle...
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Roberto Pavani replied to the thread Undergrad Mach's principle vs two counter-rotating buckets.No personal theory needed, just Newton's second law. The centrifugal effect in a rotating frame is ##F = m\omega^2 r##. This expression...
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Roberto Pavani replied to the thread Undergrad Mach's principle vs two counter-rotating buckets.Mach3 states: "The local inertial frame is completely determined by the matter distribution of the universe." This is precisely what my...
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Roberto Pavani replied to the thread Undergrad Mach's principle vs two counter-rotating buckets.It comes directly from the meaning of "relative." If rotation is purely relative (as Mach claims), then "A rotates w.r.t. the universe"...