James T. Liu
University of Michigan
Professor Liu has numerous theoretical interests, including integrable systems, particle phenomenology, and QCD. Nevertheless, he has focused his research on string theory and M-theory. He has made important contributions to the study of solitons and black holes in string theory, with particular emphasis on dualities connecting various string theories and compactifications into a single unified framework. These include the study of H-monopoles (a name coined by Gauntlett, Harvey and Liu) as well as the explanation for string/string duality based on M2/M5-duality (in work with Duff and Minasian). This latter development opened the door to eleven dimensions and was one of the important milestones in the formulation of M-theory. Overall, Professor Liu has worked extensively on supergravity solutions and their spacetime properties. He has constructed explicit monopole and brane solutions, and has used them as a means of testing various duality conjectures. Professor Liu has also focused his work on consistent Kaluza-Klein reductions and on lifting solutions to ten or eleven dimensions as a means of identifying their fundamental nature in terms of the building blocks of M-theory. Such investigations of explicit solutions and supergravity fields in nontrivial backgrounds have played important roles throughout the exploration of AdS/CFT duality and holography. Professor Liu's current interests involve generalizations of AdS/CFT as well as braneworlds and warped geometries. For the latter, he hopes to develop a closer connection between supersymmetric braneworld scenarios and M-theory. Along these lines, he is exploring the holography of bulk spaces with a cutoff as well as the consistent trapping of bulk matter on the brane. Professor Liu believes this direction of research may have important consequences for M-theory, and likes to ponder the fate of extra dimensions in the universe.