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davrosthedalek
on Feb 4, 2022
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Protons are probably smaller than long thought
That's correct. It's very hard to calculate the proton radius ab initio, even with LatticeQCD approaches.
dataflow
on Feb 4, 2022
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What does "very hard" mean here? e.g., the math is advanced? The calculations are onerous? You need too many potentially risky assumptions? etc.
evanb
on Feb 5, 2022
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I am a LQCD practitioner. “Very hard” means that even with a nontrivial fraction of all the available leadership-class supercomputing in the world we don’t have enough computer power.
Koshkin
on Feb 5, 2022
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Good question. According to Wikipedia,
Numerical lattice QCD calculations using Monte Carlo methods can be extremely computationally intensive
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davrosthedalek
on Feb 5, 2022
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Yeah, for form factors at small Q^2, you need large lattices and the convergence isn't very good --> very computational intensive.
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