I’m an electrical engineer who has studied an embarrassing amount of high-energy theory in my free time. I sometimes write about it in this blog.

diff $\times$ weyl refers to the gauge group of the bosonic string worldsheet. Weyl invariance is especially crucial to string theory.

The tagline refers to the Sidney Coleman quote (as relayed by Tony Zee): “Theoretical physics is a gentleman’s diversion.” Nowadays, of course, physics may be enjoyed by all gentle-persons.

Contact me at kyh@berkeley.edu.