Are there Extra Dimensions?
Extra dimensions-beyond length, width, height-seem the stuff of science fiction. What would extra dimensions be like? Is time the fourth dimension? Could deep reality be so strange? And, anyway, why would we care?
Nima Arkani-Hamed focuses on theory-experiment in high-energy physics, cosmological...
Juan Maldacena works on quantum field theory, quantum gravity/cosmology; string theory,...