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SpeakerDan Freed, University of Texas, Austin, Dept. of Mathematics
Date Nov 1, 2012
Time 12:00 pm  
Location 464 Loomis (1110 W Green St., Urbana)
Sponsor Physics Department
Contact Becky McDuffee
Phone 217-244-4268
Event type Other
Views 775

Wigner's basic theorem about symmetries of quantum mechanics (which may be interpreted as a theorem in Riemannian geometry) leads in many cases to discrete invariants of quantum systems. In joint work with Greg Moore we formulate in mathematical terms the notion of "topological phase" and apply it to the study of topological insulators in condensed matter physics. Topological phases are then measured by twisted equivariant K-theory.

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