JAMSTEC > Research Institute for Value-Added-Information Generation (VAiG) > Center for Mathematical Science and Advanced Technology (MAT) > Member > Hiroki Ohta
Members
Hiroki Ohta
Postdoctoral fellow
Japan Agency for Marine-Earth Science and Technology
Center for Mathematical Science and Advanced Technology
3173-25, Showa-machi, Kanazawa-ku, Yokohama-city, Kanagawa, 236-0001, Japan
hirokiohta
Short CV
I have been working on developing statistical physics with a constant interest of how to express "the mechanism of life" as an extension of the established physics.
Employment
| 2011.04 - 2011.09 | Postdoctoral fellow, Yukawa Institute for Theoretical Physics, Kyoto University |
| 2011.10 - 2013.09 | Postdoctoral researcher, LPTMS, Université Paris-Sud |
| 2013.10 - 2015.10 | Postdoctoral fellow, NBIA, University of Copenhagen |
| 2016.04 - | Postdoctoral fellow, Department of Mathematical Science and Advanced Technology, JAMSTEC |
Education
| 2002.4 - 2006.3 | B.S., Faculty of Science, Kyoto University |
| 2006.4 - 2008.3 | M.S., Department of Interdisciplinary Science, University of Tokyo |
| 2008.4 - 2011.3 | Ph.D., Department of Interdisciplinary Science, University of Tokyo |
Research Topics
- Statistical Physics
- I have been working on lattice models of nonequilibrium softmatter such as colloidal suspensions and granular materials, and heterogeneous systems such as disordered magnets. In those studies, I have focused on dramatic collective phenomena often associated with a phase transition in such systems and introduce new analytically tractable models for such a phenomenon by developing statistical-physics approach.
Lane formation in a system where particles with different colors are driven to the horizontally opposite direction
- Graph-based approach to cell dynamics
- I am recently working on using graph-based approach to obtain new basis to study cell dynamics. Though the current targets of phenomena concering cell dynamics are chemical reaction networks in a cell and microecology of microbial ecosystems, the main focus in this topic is on constructing a proper mathematical framework to study such complex systems with multi-hierarchy.
An ecosystem on a riverlike graph where each color represents different species
Publications
Original Publications (Peer-Reviewed)
- Inferring the origin of an epidemics with a dynamic message-passing algorithm
A. Y. Lokhov, M. Mezard, H. Ohta, and L. Zdeborova
Phys. Rev. E 90, 012801 (2014) - Jamming transition in kinetically constrained models with reflection symmetry
H. Ohta and S. Sasa
J. Stat. Phys. 155, 827 (2014) - Morphology transition at depinning in a solvable model of interface growth in a random medium
H. Ohta, M. L. Rosinberg, and G. Tarjus
Europhys. Lett. 104, 16003 (2013) - Lane formation in a lattice model for oppositely driven binary particles
H. Ohta
Europhys. Lett. 99, 40006 (2012) - Systematic perturbation approach for a dynamical scaling law
in a kinetically constrained spin model
H. Ohta
J. Stat. Mech. P01032 (2011) - Multi-step relaxations in the Glauber dynamics of a bond-diluted Ising model on a Bethe lattice
H. Ohta
J. Phys. A: Math. Theor. 43, 395003 (2010) - A universal form of slow dynamics in zero-temperature random-field Ising model
H. Ohta and S. Sasa
Europhys. Lett. 90, 27008 (2010) - Critical phenomena in globally coupled excitable elements
H. Ohta and S. Sasa
Phys. Rev. E 78, 065101(R) (2008) - Critical fluctuations of time-dependent magnetization in a random-field Ising model
H. Ohta and S. Sasa
Phys. Rev. E 77, 021119 (2008)