Quantum Electrodynamics - Is the QCD Scale a Dimensionless Number?

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The strong interactions also have a dimensionless number associated with them, but it's harder to tell you what that number is. The fine structure constant of electromagnetism is the most obviously dimensionless of any of the fundamental structure constants. I don't think that it means that it has any fundamental role in quantum gravity or anything like that.

Welcome to the October 2022 Ask Me Anything episode of Mindscape! These monthly excursions are funded by Patreon supporters (who are also the ones asking the questions). We take questions asked by Patreons, whittle them down to a more manageable number — based primarily on whether I have anything interesting to say about them, not whether the questions themselves are good — and sometimes group them together if they are about a similar topic. Enjoy!

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