- less infinities - less renormalization - more natural -hints of role for gravity supergravity – 3. Super-gravity attempts to unify all four fundamental interactions Theories of Everything (ToE) and electromagnetism Kaluza (1921): ‘unified’ GR Wrote GR in 5 dimensions, em appears naturally Klein (1927): converted Kaluza theory to quantum field theory Einstein; attemoted to generalize Snag: no new predictions, no evidence Today: super-gravity Super-symmetric version of GR SUSY-GUT with gravity incorporated Snag; not a quantum field theory (better than GR) 3. Superstring theory string theory Veneziano (1968): solution to model of the hadrons ‘bootstrap’
- less infinities - less renormalization - more natural -hints of role for gravity – supergravity 3. Super-gravity attempts to unify all four fundamental interactions Theories of Everything (ToE) Kaluza (1921): ‘unified’ GR and electromagnetism Wrote GR in 5 dimensions, em appears naturally Klein (1927): converted Kaluza theory to quantum field theory Einstein; attemoted to generalize Snag: no new predictions, no evidence Today: super-gravity Super-symmetric version of GR SUSY-GUT with gravity incorporated Snag; not a quantum field theory (better than GR) 3. Superstring theory string theory Veneziano (1968): solution to ‘bootstrap’ model of the hadrons
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