ohwilleke's latest activity
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ohwilleke reacted to mitchell porter's post in the thread I Is Gravi-GUT a candidate theory of everything? with
Informative.
Just to be clear, I claimed the problem was that chiral gravi-GUTs want to use SU(2)R as the gravitational gauge group, but in... -
It was actually P-violation (discovered in 1956). https://en.wikipedia.org/wiki/CP_violation#P-symmetry
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Here's a short but tasteful obituary (hope the link wasn't already posted. I searched. Also in that other thread.)...
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ohwilleke replied to the thread I Question of accuracy of galactic collision simulations.The reason that this particular example is so hard is not because it is, fundamentally, a huge many body problem, but because the...
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ohwilleke reacted to FactChecker's post in the thread I Question of accuracy of galactic collision simulations with
Like.
I spent my entire career in simulation (not this type). This strikes me as an exceedingly difficult subject to simulate. The numbers... -
ohwilleke replied to the thread I Question of accuracy of galactic collision simulations.One of the rather surprising observational facts about dark matter distributions in galaxies is that they show surprising similarities...
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ohwilleke replied to the thread I Question of accuracy of galactic collision simulations.After giving it some more thought, the reason that I think that the simulation rather than the astronomy observations are the main...
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ohwilleke replied to the thread I Question of accuracy of galactic collision simulations.This is definitely a possibility. When you are comparing simulations to astronomy observations, I focused on the issues with the...
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ohwilleke replied to the thread I Question of accuracy of galactic collision simulations.Astronomy/cosmology simulations do two main things: 1. They rely on a set of assumptions about the physics involved, which are physics...
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https://en.wikipedia.org/wiki/Yang_Chen-Ning ( photo from http://insti.physics.sunysb.edu/~yang/ )...
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Theoretical physicist C.N. Yang died at the age of 103 years on October 18, 2025. He is the Yang in Yang-Mills theory, which he and his...
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ohwilleke reacted to pines-demon's post in the thread Asimov's Foundation: Am I the only one who likes the show more? with Like.
Oh boy I finally got to watch season 2. What a fabulous... mess. I can say that: I liked most of the fabricated new plots related to...
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ohwilleke replied to the thread I Is Gravi-GUT a candidate theory of everything?.A gravi-GUT could be a TOE but wouldn't necessarily be, in the strict sense. A GUT is a unified theory of the three SM forces. A TOE...
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ohwilleke reacted to PeroK's post in the thread I How Can Photons Be Massless Yet Have Energy According to Einstein's Equations? with Like.
The equation ##E = mc^2## only applies to a particle with mass. And, indeed, that's its energy only when it is at rest. The full...
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ohwilleke reacted to Ibix's post in the thread I How Can Photons Be Massless Yet Have Energy According to Einstein's Equations? with Like.
That formula is only correct for stationary massive objects. The general formula is ##m^2c^4=E^2-p^2c^2##, from which you can see that...