理工学部 機能創造理工学科

Hirano Tetsufumi

  (平野 哲文)

Profile Information

Affiliation
Professor, Faculty of Science and Technology, Department of Engineering and Applied Sciences, Sophia University
Degree
Ph.D(Mar, 2001, Waseda University)

Researcher number
40318803
J-GLOBAL ID
201201033858822423
researchmap Member ID
7000003538

External link

(Subject of research)
Transport properties of the quark gluon plasma in high-energy heavy ion collisions


Major Papers

 109
  • Kenshi Kuroki, Azumi Sakai, Koichi Murase, Tetsufumi Hirano
    Physics Letters B, 842 137958-137958, May, 2023  Peer-reviewedCorresponding author
  • Yuuka Kanakubo, Yasuki Tachibana, Tetsufumi Hirano
    Physical Review C, 106(5) 054908-1-054908-7, Nov 18, 2022  Peer-reviewedCorresponding author
  • Yuuka Kanakubo, Yasuki Tachibana, Tetsufumi Hirano
    Physical Review C, 105(2) 024905-1-024905-23, Feb 9, 2022  Peer-reviewed
  • Azumi Sakai, Koichi Murase, Tetsufumi Hirano
    Physical Review C, 102(6) 064903-1-064903-15, Dec 2, 2020  Peer-reviewed
  • Yuuka Kanakubo, Yasuki Tachibana, Tetsufumi Hirano
    Physical Review C, 101(2) 024912-1-024912-12, Feb 24, 2020  Peer-reviewed
  • Tetsufumi Hirano, Ryuichi Kurita, Koichi Murase
    Nuclear Physics A, 984 44-67, Jan 28, 2019  Peer-reviewed
  • Yuuka Kanakubo, Michito Okai, Yasuki Tachibana, Tetsufumi Hirano
    Progress of Theoretical and Experimental Physics, 2018(12) 121D01, Dec 1, 2018  Peer-reviewed
  • Yukinao Akamatsu, Masayuki Asakawa, Tetsufumi Hirano, Masakiyo Kitazawa, Kenji Morita, Koichi Murase, Yasushi Nara, Chiho Nonaka, Akira Ohnishi
    PHYSICAL REVIEW C, 98(2) 024909-1-024909-9, Aug, 2018  Peer-reviewed
    We develop a new dynamical model for high-energy heavy-ion collisions in the beam energy region of the highest net-baryon densities on the basis of nonequilibrium microscopic transport model JAM and macroscopic (3 + 1)-dimensional hydrodynamics by utilizing a dynamical initialization method. In this model, dynamical fluidization of a system is controlled by the source terms of the hydrodynamic fields. In addition, time-dependent core-corona separation of hot regions is implemented. We show that our new model describes multiplicities and mean transverse mass in heavy-ion collisions within a beam-energy region of 3 < root s(NN) < 30 GeV. Good agreement of the beam-energy dependence of the K+/pi(+) ratio is obtained, which is explained by the fact that a part of the system is not thermalized in our core-corona approach.
  • Michito Okai, Koji Kawaguchi, Yasuki Tachibana, Tetsufumi Hirano
    PHYSICAL REVIEW C, 95(5), May, 2017  Peer-reviewed
    We propose a new approach to initialize the hydrodynamic fields, such as energy density distributions and four-flow velocity fields in hydrodynamic modeling of high-energy nuclear collisions at the collider energies. Instead of matching the energy-momentum tensor or putting the initial conditions of quark-gluon fluids at a fixed initial time, we utilize a framework of relativistic hydrodynamic equations with source terms to describe the initial stage. Putting the energy and momentum loss rate of the initial partons into the source terms, we obtain hydrodynamic initial conditions dynamically. The resultant initial profile of the quark-gluon fluid looks highly bumpy as seen in the conventional event-by-event initial conditions. In addition, initial random flow velocity fields also are generated as a consequence of momentum deposition from the initial partons. We regard the partons that survive after the dynamical initialization process as the mini-jets and find sizable effects of both mini-jet propagation in the quark-gluon fluids and initial random transverse flow on the final momentum spectra and anisotropic flow observables. We perform event-by-event (3+1)-dimensional ideal hydrodynamic simulations with this new framework that enables us to describe the hydrodynamic bulk collectivity, parton energy loss, and interplay among them in a unified manner.

Misc.

 76

Books and Other Publications

 2

Presentations

 68

Professional Memberships

 2

Research Projects

 9

Other

 2