Matterwave's latest activity
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Matterwave reacted to PeterDonis's post in the thread High School The problem of energy appearing out of nowhere with
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Yes. No, it doesn't, because in GR the local conservation of stress-energy is enforced by the Einstein Field Equation. So it's... -
Matterwave replied to the thread High School The problem of energy appearing out of nowhere.This is quite a loose definition of conservation of energy imo. Yeah, the OP's original grossly energy violating "energy just pops out...
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Matterwave replied to the thread High School The problem of energy appearing out of nowhere.Do you define GR to "obey relativity" (or do you read "obey relativity" as global Lorentz invariance)? Depending on the reading of the...
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Matterwave reacted to berkeman's post in the thread Physics/math: how much knowledge does a high school teacher need? with Like.
I'm not sure I like the metaphor of "standing above their pupils", at least in a STEM teaching environment. I've tutored numerous folks...
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Matterwave replied to the thread Undergrad FLRW metric challenged, Einstein-Euler equations as alternative?.The universe is certainly not strictly isotropic. Even around us, the cmb has fluctuations. My statement was about the mathematics and...
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Matterwave replied to the thread High School Does this equation (Einstein’s field equations in general relativity) equal 12?.Any equation is divisible (on both sides) by 1/2. For if x=y, then surely 2x=2y. Therefore by the argument given, you get 12 every time...
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Matterwave replied to the thread Undergrad Why did the photon lose its license?.> ...to be the same event from its own perspective... (Ignoring the "from its own perspective" since that doesn't make sense within the...
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Matterwave replied to the thread Undergrad Application of the Schrödinger Equation in Modeling the Hydrogen Atom.The "solution" for the hydrogen atom using Schrodinger's equation leads to quite a wide ranging discussion if we allow it to. It would...
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Matterwave replied to the thread Graduate Musing on the Foundations of Statistical Mechanics.I'm quite interested to see what Khinchin has to say about this topic because he has so far been very mathematically rigorous. But I'm...
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Matterwave replied to the thread Undergrad Landau Mechanics Chapter 2 Problem 1: Direction of Potential Energy?.It seems your confusion is not reading that the U1 and U2 are constants.
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Matterwave replied to the thread Graduate Musing on the Foundations of Statistical Mechanics.Ok then~ I have a lot of random thoughts so I'll just first post something rough otherwise I'll never post anything if I'm trying to be...
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Matterwave replied to the thread Undergrad Question about entanglement and relative causality.Relativity gives casual structure based on light cones. One must be quite careful in assigning "reality" to global planes of...
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Matterwave replied to the thread Undergrad Do non-orthogonal coordinate systems mean dependent coordinates?.This is one of those things that's way easier to see visually than to describe in words. Geometry is nice like that! It is easy to...
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Matterwave reacted to bhobba's post in the thread Is the quantum wave function a real object or a mathematical tool? with Like.
Keep it going if you want. I have put my view on the record, so I will not participate much more. If it slips too much into...
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Matterwave posted the thread Graduate Musing on the Foundations of Statistical Mechanics in Thermodynamics.Hello~ I've been reading about the Foundations of Statistical Mechanics recently and found the topic of foundations Entropy quite...