Lecture Zohar Nussinov
|18 november 2003||FWN-Building 5116.0116, Nijenborgh 4, 9747 AG, Groningen|
|Speaker:||Dr. Zohar Nussinov|
|Affiliation:||Theoretical Division, Los Alamos National Laboratory, USA|
|Title:||Glassy behavior in geometrically frustrated systems and the inverse glass problem|
|Date:||Tue Nov 18, 2003|
|Telephone:||+31 50 3634369|
We will show how glassy dynamics and constrained geometry might be intertwined in various instances. On their own, without any geometrical constraints, many systems would like to quickly freeze into a local ideal "crystal" which cannot tile flat space but may do so in higher dimensions. When supercooled, various liquids do not have enough time to "compute" their true FCC/BCC etc. minimum and may consequently veer towards such local ideal packing configurations. These notions have been numerically tested. We examine the consequences of these notions and show how glassy dynamics and non-trivial thermodynamics might arise.
We will also consider the inverse glass problem: by allowing the system to become less geometrically constrained, we may dramatically increase its dynamics and the convergence to its true minimum. We show how we attempt to employ such notions in solving hard combinatorial problems such as the NP-complete largest clique problem that converge very slowly by the standard simulated annealing methods (wherein it displays glassy like dynamics).
|Laatst gewijzigd:||22 oktober 2012 14:30|