jbergman's latest activity
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Jjbergman reacted to Matterwave's post in the thread Graduate Is photon frequency intrinsic or observer-dependent? with
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Not sure why you bring GR into this and not sure why you bring photons into this. The measured frequency of waves depend on relative... -
Jjbergman replied to the thread Graduate Position vs momentum measurement.A bit of a misnomer to measure position at one point. Detectors measure a position interval therefore they don't collapse the state to a...
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Jjbergman replied to the thread Undergrad Is the Cauchy stress tensor really a tensor?.Just to be clear the Cauchy Stress tensor is actually a ##(1,1)## tensor so ## T: V\times V^* \to \mathbb R##. So no isomorphism is...
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Jjbergman reacted to Ibix's post in the thread Undergrad Why does coordinate dependence violate homogeneity in spacetime intervals? with
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Homogeneity of space means invariance under purely spatial translations. Thus if you have two events whose coordinates are ##x_a##... -
Jjbergman replied to the thread Undergrad Why the initial choice matters in the Monty Hall problem.I want to elaborate on my previous post. Imagine the game is changed. You have three doors, one, with a car behind it. Now you can...
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Jjbergman replied to the thread Undergrad Why the initial choice matters in the Monty Hall problem.It's really simple. Would you rather get to pick 2 doors or 1. By switching you are essentially getting to look behind the two doors you...
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Jjbergman reacted to wrobel's post in the thread Graduate On covariance of the Lagrange equations with
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see https://arxiv.org/abs/2607.24825 for details -
Jjbergman replied to the thread Undergrad Particle vs Wave Interpretations of QM.There are critiques of this argument similar to this, see https://arxiv.org/abs/quant-ph/0312058?hl=en-US . Not sure how accepted...
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Jjbergman replied to the thread Undergrad Particle vs Wave Interpretations of QM.This Zurek paper explains in more detail how you get multiple different decoherent branches, https://arxiv.org/abs/quant-ph/0405161 ...
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Jjbergman reacted to Matterwave's post in the thread Undergrad A differential geometry question from continuum mechanics with
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I am not aware of a way to in general fix this integral in the sense that there is a unique 1:1 correspondence between this integral and... -
Jjbergman reacted to Matterwave's post in the thread Undergrad A differential geometry question from continuum mechanics with
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Yes, but that choice is path dependent. Any two tangent spaces at ##p_1,\, p_2## can be made isomorphic via the connection if you... -
Jjbergman reacted to Matterwave's post in the thread Undergrad A differential geometry question from continuum mechanics with
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Yeah, I think in general you need some vector field to "ground" you as you move around the manifold. In my post #3 I suggested using a... -
Jjbergman replied to the thread Undergrad A differential geometry question from continuum mechanics.Yes, I guess that's true. Now, I think you need some preferred basis of some kind.
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Jjbergman reacted to Matterwave's post in the thread Undergrad A differential geometry question from continuum mechanics with
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Ah got it, I was not familiar with this terminology. Hadn't realized this. Interesting point. Given the basis exists on ##D##, how... -
Jjbergman reacted to WWGD's post in the thread Undergrad Particle vs Wave Interpretations of QM with
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And the Bohmian Rhpsody.