Directory

• Faculty
• Staff
• Research Scientists
• Post Doctoral
• Grad Students


• UD people search

Maps and Directions

• Big Campus Map
• Parking

Visiting UD

• Hotels, more maps, directions ...

Stephen M. Barr

Title: Office: Phone: email: Web:

Professor 209 Sharp Lab (302) 831-6883 smbarr@bartol.udel.edu www.physics.udel/~smbarr

Fields of Research

Dr. Barr received his undergraduate degree from Columbia and his graduate degrees from Princeton. After post-doctoral work at the University of Pennsylvania, he became a research assistant professor at the University of Washington (1980-85) and associate physicist at Brookhaven National Laboratory (1985-87). He joined Bartol in September 1987.

His research has spanned many areas of theoretical particle physics, but with special emphasis on grand unified theories, theories of CP violation, the problem of the origin of quark and lepton masses, theories with extra space-time dimensions (such as Kaluza-Klein and superstring theories), and the interface between particle physics and cosmology.

He has made significant contributions in all these areas, perhaps the most notable being the development of classes of models that solve the important “strong CP problem” (the problem of why the strong interactions unlike the weak are symmetric under CP), the development of the idea that the pattern of quark and lepton masses is due to effects at the unification scale, the co-discovery of the important “flipped SU(5)” grand unification scheme, work on theories of baryogenesis (the origin of matter at the time of the big bang), the discovery of large contributions to the electric and magnetic dipole moments of elementary particles in theories with an extended Higgs structure, contributions to the development of realistic SO(10) grand unified models, and a mechanism for explaining the large mixing observed in atmospheric data between muon and tau neutrinos.