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math-ph2018
Local models and global constraints for degeneracies and band crossings
Ralph M. Kaufmann, Sergei Khlebnikov, Birgit Wehefritz-Kaufmann
We study topological properties of families of Hamiltonians which may contain degenerate energy levels aka. band crossings. The primary tool are Chern classes, Berry phases and sli…
math.AT2018
A detailed look on actions on Hochschild complexes especially the degree co-product and actions on loop spaces
Ralph M. Kaufmann
We explain our previous results about Hochschild actions [Kau07a, Kau08a] pertaining in particular to the coproduct which appeared in a different form in [GH09] and provide a fresh…