PeroK's latest activity
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##(ab)|_1^2\neq a|_1^2\,b|_1^2## -
PeroK reacted to JimWhoKnew's post in the thread Undergrad Klein-Gordon equation in the nonrelativistic limit with
Like.
From relativity, having the rest mass as the limit of the energy when the kinetic contribution goes to zero, is a welcome feature... -
PeroK reacted to JimWhoKnew's post in the thread Undergrad Klein-Gordon equation in the nonrelativistic limit with Like.
Try to back-substitute$$\phi=\psi\exp{\left[\frac{i}{\hbar}m_0c^2t\right]}$$in equation 1.32 . What equation does ##\psi## obey in this...
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PeroK reacted to Ibix's post in the thread High School Estimates — True Size of the Universe? with Like.
The problem with this one is the finite size. People conflate the increase in volume of the finite lump of dough with the expansion...
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This was back when people needed talent. Today they stick any pretty in slutty clothes, put a microphone in her hands and process the...
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PeroK reacted to robphy's post in the thread Undergrad Derive the Lorentz transformation in Minkowski four-dimensional spacetime spacetime with Like.
First, I acknowledge what you say about spacetime diagrams being confusing. So, some of my efforts have tried to develop additional...
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PeroK replied to the thread High School Estimates — True Size of the Universe?.This is a property of an infinite space. And infinite sets in general. For example, in one sense there are twice as many whole numbers...
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PeroK replied to the thread Student of Astronomy and planetary science.If you look for the top 10 cosmology forums, then the first three will be in that list.
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PeroK reacted to A.T.'s post in the thread Undergrad Why if net force=zero, moment at any point is same? with Like.
If ##\vec{F_{net}}## is the net force, and ##\vec{M_{net,a}}## is the net moment around the point ##\vec{a}##, then the net moment...
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@PeroK . Stop complaining about AI - you're better by far!
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PeroK replied to the thread Member and Mentor Appreciation Thread.There's only one of me. AI can proliferate and multi-task.
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PeroK replied to the thread Undergrad Relational event horizons?.In flat spacetime (Special Relativity) it's conventional to talk about "observers" or "inertial observers". This often means...
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PeroK replied to the thread Undergrad Derive the Lorentz transformation in Minkowski four-dimensional spacetime spacetime.I'm one of the few students, it seems, that finds spacetime diagrams confusing. The problem is that the diagram you have drawn is in...
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PeroK reacted to Xinze's post in the thread Undergrad Derive the Lorentz transformation in Minkowski four-dimensional spacetime spacetime with Like.
I attempted to draw a Minkowski four-dimensional spacetime diagram, using frame K as the reference frame. I identified a point A with...
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IMO, there are some good books that attempt to motivate the concepts of SR and GR with minimal mathematics. They are "Relativity...