iTHEMS Theoretical Physics Seminar
Quantum mechanical description of energy dissipation and application to heavy-ion fusion reactions
February 16 at 13:00 - 14:30, 2021
Mr. Masaaki Tokieda (Graduate students, Department of Physics, Tohoku University)
For theoretical description of heavy-ion fusion reactions, two different models have been used depending on the incident energy. At energies above the Coulomb barrier, importance of energy dissipation...more
Venue: via Zoom
Event Official Language: English
Quantum kinetic theory for chiral and spin transport in relativistic heavy ion collisions and core-collapse supernovae
February 4 at 13:00 - 14:30, 2021
Dr. Di-Lun Yang (Assistant professor, Faculty of Science and Technology, Keio University)
Recently, the anomalous transport phenomena of relativistic fermions associated with chirality and spin induced by external fields have been greatly explored in different areas of physics. Notably, su...more
Venue: via Zoom
Event Official Language: English
Many body problems from quarks to stellar evolutions
January 28 at 13:30 - 15:00, 2021
Prof. Nobutoshi Yasutake (Associate Professor, Chiba Institute of Technology)
The many-body problems are major problems that need to be clarified not only in nuclear physics, but also in astronomy. In this seminar, I introduce stellar evolutions as gravitational many-body probl...more
Venue: via Zoom
Event Official Language: English
Classical liquids and functional renormalization group
December 17 at 13:00 - 14:30, 2020
Dr. Takeru Yokota (Postdoctoral Researcher, Institute for Solid State Physics, The University of Tokyo)
Development of methods for classical statistical mechanics is desired for accurate predictions of the structures and thermodynamic properties of liquids. A powerful framework to describe classical liq...more
Venue: via Zoom
Event Official Language: English
Conserved charges in gravity and entropy
December 10 at 13:00 - 14:30, 2020
Dr. Shinya Aoki (Professor, Yukawa Institute for Theoretical Physics, Kyoto University)
We propose a manifestly covariant definition of a conserved charge in gravity. We first define a charge density from the energy momentum tensor with a Killing vector, if exists in the system, and calc...more
Venue: via Zoom
Event Official Language: English
KPZ equation, attractive bosons, and the Efimov effect
December 3 at 13:00 - 14:30, 2020
Dr. Yusuke Nishida (Associate Professor, Department of Physics, Tokyo Institute of Technology)
The Kardar-Parisi-Zhang (KPZ) equation for surface growth has been a paradigmatic model in nonequilibrium statistical physics. In particular, it in dimensions higher than two undergoes a roughening tr...more
Venue: via Zoom
Event Official Language: English
Some idea on quantum tunneling via Lefschetz thimbles
November 12 at 10:30 - 12:00, 2020
Dr. Yuya Tanizaki (Assistant Professor, Yukawa Institute for Theoretical Physics, Kyoto University)
In this talk, I will explain my previous study with Takayuki Koike on a possible approach to quantum tunneling via Lefschetz thimbles. We classified all the complex saddle points for the real-time pat...more
Venue: via Zoom
Event Official Language: English
Toward simulating Superstring/M-theory on a Quantum Computer
October 23 at 17:00 - 18:00, 2020
Dr. Masanori Hanada (Department of Mathematics, University of Surrey, UK)
We present a framework for simulating superstring/M-theory on a quantum computer, based on holographic duality. Because holographicduality maps superstring/M-theory to quantum field theories (QFTs), w...more
Venue: via Zoom
Event Official Language: English
Realistic shell model and chiral three-body force
October 22 at 13:30 - 15:00, 2020
Dr. Tokuro Fukui (Researcher, Yukawa Institute for Theoretical Physics, Kyoto University)
We show an evolution to derive the effective Hamiltonian in the shell-model framework starting from two- and three-body interactions based on the chiral effective field theory. A new way to calculate ...more
Venue: via Zoom
Event Official Language: English
Lefschetz-thimble inspired analysis of the Dykhne–Davis–Pechukas method and an application for the Schwinger Mechanism
August 21 at 13:00 - 14:30, 2020
Dr. Takuya Shimazaki (Researcher, Hadron Theory Group, The University of Tokyo)
Dykhne–Davis–Pechukas (DDP) method is a common approximation scheme for the transition probability in two-level quantum systems, as realized in the Landau–Zener effect, leading to an exponentially dam...more
Venue: via Zoom
Event Official Language: English
Nambu-Goldstone fermion in a Bose-Fermi mixture with an explicitly broken supersymmetry
August 7 at 13:00 - 14:30, 2020
Dr. Hiroyuki Tajima (PhD, Department of Natural Science, Kochi University)
Supersymmetry, which is a symmetry associated with interchange between bosons and fermions, is one of the most important symmetries in high-energy physics but its evidence has never been observed yet....more
Venue: via Zoom
Event Official Language: English
Complex Langevin study of an attractively interacting two-component Fermi gas in 1D with population imbalance
July 10 at 13:30 - 14:30, 2020
Dr. Shoichiro Tsutsui (Postdoctral Researchers, Quantum Hadron Physics Laboratory, RIKEN)
We investigate an attractively interacting two-component Fermi gas in 1D described by the Gaudin-Yang model with population imbalance. While the Gaudin-Yang model is known as a solvable model based on...more
Venue: via Zoom
Event Official Language: English
Field theoretical approach to relativistic hydrodynamics
June 12 at 13:00 - 14:30, 2020
Dr. Masaru Hongo (Visiting Scientist (Academia), iTHEMS / Postdoctoral Research Associate, Physics Dept., The University of Illinois at Chicago, UIC)
Hydrodynamics is a low-energy effective theory of a conserved charge density, which describes a long-distance and long-time behavior of many-body systems. It is applicable not only to a non-relativist...more
Event Official Language: English