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math.QA1999
Topological gravity in dimensions two and four
Jack Morava
Recent work by physicists on gravity in two dimensions has a natural generalization to four dimensions, formulated in terms of an analogue of Segal's category [defined for the stud…
math.QA1998
Schur Q-functions and a Kontsevich-Witten genus
Jack Morava
The Virasoro operations in Witten's theory of two-dimensional topological gravity have a homotopy-theoretic interpretation as endomorphisms of an ordinary cohomology theory with co…
math.QA1998
Quantum generalized cohomology
Jack Morava
We construct a ring structure on complex cobordism tensored with the rationals, which is related to the usual ring structure as quantum cohomology is related to ordinary cohomology…