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NOTICE: I created the new site (you can jump from here), so I will stop update of this site from Jan. 2017.
Tanizaki, Yuya (谷崎佑弥) Special Postdoctoral Researcher at Theory Group, RIKEN BNL Research Center Bldg. 510A #268, Physics Dept., BNL Pennsylvania St., Upton, NY 11973, US yuya.tanizaki(at)riken.jp News 
Nonperturbative Quantum Field Theory
When I came into the game of theoretical physics, quantum field theory already had a long histroy, and then physicists understood its many features (at least in some limiting cases). If the system is weakly coupled, perturbation theory with the meanfield approximation fairly works well. However, there are still many things to be understood in stronglycoupled QFTs! I'm interested in strongly interacting manybody systems from the viewpoint of quantum field theories. Path Integral via Lefschetz Thimbles
Recently, PicardLefschetz theory attracts theoretical attention as a new approach to nonperturbative aspects of quantum mechanics. Its usefulness is found through its application to ChernSimons theory, and it might provide a theoretical foundation of the resurgent transseries expansion of quantum mechanics. Superfluidity and Superconductivity in Ultracold Atoms and Neutron Stars; BCSBEC crossover
Phase structure of Gauge Theories
