Physics Forums - View Single Post - Grav. + GUT (Gravity from a Particle Physicist's perspective)

**garrett** · Oct29-09, 03:08 PM

Hello PF folk.

If you believe the Dirac equation in curved spacetime, and you believe Spin(10) grand unification, then a Spin(3,11) GraviGUT, acting on one generation of fermions as a 64 spinor, seems... inevitable.

Also, it's pretty.

And it's up to you whether or not to take seriously or not the observation that this whole structure fits in E8. Personally, I take it seriously. Slides are up for a talk I gave at Yale:

http://www.liegroups.org/zuckerman/slides.html

Best,
Garrett

Oct29-09, 03:08 PM	#26
garrett garrett is Offline: Posts: 318	Re: Grav. + GUT (Gravity from a Particle Physicist's perspective) Hello PF folk. If you believe the Dirac equation in curved spacetime, and you believe Spin(10) grand unification, then a Spin(3,11) GraviGUT, acting on one generation of fermions as a 64 spinor, seems... inevitable. Also, it's pretty. And it's up to you whether or not to take seriously or not the observation that this whole structure fits in E8. Personally, I take it seriously. Slides are up for a talk I gave at Yale: http://www.liegroups.org/zuckerman/slides.html Best, Garrett