https://www.youtube.com/watch?v=4V0TYIO6yv4 ]]>

Thanks! Taking a quick look at those papers, it’s remarkable what a tricky problem this is and I think it’s fair to say that it’s still not clear if it is solved.

]]>In response to your “could also just keep repeating my own favorite intriguing ideas”, there have been some progress in trying to formulate a non-perturbative chiral gauge theory, cf:

Nonperturbative Regulator for Chiral Gauge Theories? Grabowska, Kaplan.

Phys.Rev.Lett. 116 (2016) no.21, 211602, arXiv:1511.03649 [hep-lat]

and

Chiral solution to the Ginsparg-Wilson equation. Grabowska, Kaplan. Phys.Rev. D94 (2016) no.11, 114504 arXiv:1610.02151 [hep-lat]

I’ll keep this in mind and try and post more often about intriguing new ideas that I see. The depressing thing about the current state of HEP theory is that interesting new ideas are very few and far between.

I could also just keep repeating my own favorite intriguing ideas, which don’t change much and haven’t seen any progress. I happened to run across an old posting about this from seven years ago, see

http://www.math.columbia.edu/~woit/wordpress/?p=2876

I don’t think there’s been significant developments on those problems since then, the first and third are motivations for things I’m working on now that the book is finished.

Thanks, I thought I had fixed that typo, now done. ]]>