40 citations · 216 across the 15 of their papers we have counts for
16 papers
Fast free-energy estimation for complex systems with nonreversible simulated tempering
Yoshihiko Nishikawa, Koji Hukushima
We discuss free-energy estimation for complex systems using simulated tempering with Wang--Landau-type feedback. We show that introducing nonreversible dynamics in temperature spac…
Dynamical Criticality of a Machine-learning-assisted Monte Carlo algorithm for a Mean-Field Spin Glass model
Seiya Miyamoto, Masayuki Ohzeki, Yoshihiko Nishikawa
We critically assess the performance of an autoregressive generative neural network model by applying it to an antiferromagnetic Ising model on a random regular graph. We train the…
Irreversible swap algorithms for soft sphere glasses
Yoshihiko Nishikawa, Federico Ghimenti, Ludovic Berthier +1
We extend to soft repulsive interaction potentials a recently proposed irreversible swap algorithm originally designed for polydisperse hard spheres. The original algorithm perform…
Phase transition in large language models and the criticality of natural languages
Kai Nakaishi, Yoshihiko Nishikawa, Koji Hukushima
Generation of text and speech in natural languages can be modeled as a stochastic process. This idea dates back to the seminal work of Markov and, later, to that of Shannon and als…
Random Postprocessing for Combinatorial Bayesian Optimization
Keisuke Morita, Yoshihiko Nishikawa, Masayuki Ohzeki
Model-based sequential approaches to discrete "black-box" optimization, including Bayesian optimization techniques, often access the same points multiple times for a given objectiv…
Collective relaxation dynamics in a three-dimensional lattice glass model
Yoshihiko Nishikawa, Ludovic Berthier
We numerically elucidate the microscopic mechanisms controlling the relaxation dynamics of a three-dimensional lattice glass model that has static properties compatible with the ap…
The Liquid--Hexatic Transition for Soft Disks
Yoshihiko Nishikawa, Werner Krauth, A. C. Maggs
We study the liquid--hexatic transition of soft disks with massively parallel simulations and determine the equation of state as a function of system size. For systems with interac…
Hard-disk computer simulations -- a historic perspective
Botao Li, Yoshihiko Nishikawa, Philipp Hoellmer +3
We discuss historic pressure computations for the hard-disk model performed since 1953, and compare them to results that we obtain with a powerful event-chain Monte Carlo and a mas…
Collective dynamics in a glass-former with Mari-Kurchan interactions
Yoshihiko Nishikawa, Atsushi Ikeda, Ludovic Berthier
We numerically study the equilibrium relaxation dynamics of a two-dimensional Mari-Kurchan glass model. The tree-like structure of particle interactions forbids both non-trivial st…
Stationary Bootstrap: A Refined Error Estimation for Equilibrium Time Series
Yoshihiko Nishikawa, Jun Takahashi, Takashi Takahashi
In Markov-chain Monte Carlo simulations, estimating statistical errors or confidence intervals of numerically obtained values is an essential task. In this paper, we review several…
Relaxation dynamics in the energy landscape of glass-forming liquids
Yoshihiko Nishikawa, Misaki Ozawa, Atsushi Ikeda +2
We numerically study the zero-temperature relaxation dynamics of several glass-forming models to their inherent structures, following quenches from equilibrium configurations sampl…
Relaxation dynamics of non-Brownian spheres below jamming
Yoshihiko Nishikawa, Atsushi Ikeda, Ludovic Berthier
We numerically study the relaxation dynamics and associated criticality of non-Brownian frictionless spheres below jamming in spatial dimensions , , , and , and in th…
Lattice glass model in three spatial dimensions
Yoshihiko Nishikawa, Koji Hukushima
The understanding of thermodynamic glass transition has been hindered by the lack of proper models beyond mean-field theories. Here, we propose a three-dimensional lattice glass mo…
Solid--liquid transition of skyrmions in a two-dimensional chiral magnet
Yoshihiko Nishikawa, Koji Hukushima, Werner Krauth
We study the melting of skyrmions in a two-dimensional Heisenberg chiral magnet with bi-axial Dzyaloshinskii--Moriya interactions. These topological excitations may form at zero te…
Phase transitions and ordering structures of a model of chiral helimagnet in three dimensions
Yoshihiko Nishikawa, Koji Hukushima
Phase transitions in a classical Heisenberg spin model of a chiral helimagnet with the Dzyaloshinskii--Moriya (DM) interaction in three dimensions are numerically studied. By using…
Event-chain algorithm for the Heisenberg model: Evidence for dynamic scaling
Yoshihiko Nishikawa, Manon Michel, Werner Krauth +1
We apply the event-chain Monte Carlo algorithm to the three-dimensional ferromagnetic Heisenberg model. The algorithm is rejection-free and also realizes an irreversible Markov cha…