研究者詳細 - 宮崎　州正

論文 - 宮崎　州正

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Brownian motion with multiplicative noises revisited

Kuroiwa T., Miyazaki K.

JOURNAL OF PHYSICS A-MATHEMATICAL AND THEORETICAL 47 巻 ( 1 ) 2014年1月

28pAC-4 ガラス転移における平均場シナリオの理論的検証(28pAC 領域12,領域11合同ガラス合同2,領域12(ソフトマター物理・化学物理・生物物理))

池田晴國, 宮崎州正

日本物理学会講演概要集 69.1.2 巻 ( 0 ) 頁： 412 2014年

特集「ガラス転移とシミュレーション」―はじめに―

宮崎州正

アンサンブル 16 巻 ( 2 ) 頁： 77 - 78 2014年

30aPS-144 Phase Diagram of a Random Pinning Glass

尾澤岬, 池田昌司, 宮崎州正

日本物理学会講演概要集 69.1.2 巻 ( 0 ) 頁： 433 2014年

26aKP-2 MCTとレプリカ液体論の融合に向けた試み(ガラス合同2,領域12,領域11合同,領域12(ソフトマター物理,化学物理,生物物理))

池田晴國, 宮崎州正

日本物理学会講演概要集 68.2.2 巻 ( 0 ) 頁： 310 2013年

26aKP-8 Dynamical heterogeneityとShear transformation zoneの関係のシミュレーションによる考察(ガラス合同2,領域12,領域11合同,領域12(ソフトマター物理,化学物理,生物物理))

尾澤岬, 宮崎州正

日本物理学会講演概要集 68.2.2 巻 ( 0 ) 頁： 311 2013年

Universal mechanism of shear thinning in supercooled liquids 査読有り Open Access

Mizuno H., Ikeda A., Kawasaki T., Miyazaki K.

Communications Physics 7 巻 ( 1 ) 2024年7月

掲載種別：研究論文（学術雑誌）出版者・発行元：Communications Physics

Soft glassy materials experience a significant reduction in viscosity η when subjected to shear flow, known as shear thinning. This phenomenon is characterized by a power-law scaling of η with the shear rate γ°, η∝γ°−ν, where the exponent ν is typically around 0.7 to 0.8 across different materials. Two decades ago, the mode-coupling theory (MCT) suggested that shear thinning occurs due to the advection. However, it predicts too large ν = 1 (> 0.7 to 0.8) and overestimates the onset shear rate by orders of magnitude. Recently, it was claimed that a minute distortion of the particle configuration is responsible for shear thinning. Here we extend the MCT to include the distortion, and find that both advection and distortion contribute to shear thinning, but the latter is dominant. Our formulation works quantitatively for several different glass formers. We explain why shear thinning is universal for many glassy materials.

DOI： 10.1038/s42005-024-01685-8

Open Access

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その他リンク： https://www.nature.com/articles/s42005-024-01685-8

Unified Understanding of Nonlinear Rheology near the Jamming Transition Point 査読有り

Kawasaki T., Miyazaki K.

Physical Review Letters 132 巻 ( 26 ) 2024年6月

掲載種別：研究論文（学術雑誌）出版者・発行元：Physical Review Letters

When slowly sheared, jammed packings respond elastically before yielding. This linear elastic regime becomes progressively narrower as the jamming transition point is approached, and rich nonlinear rheologies such as shear softening and hardening or melting emerge. However, the physical mechanism of these nonlinear rheologies remains elusive. To clarify this, we numerically study jammed packings of athermal frictionless soft particles under quasistatic shear γ. We find the universal scaling behavior for the ratio of the shear stress σ and the pressure P, independent of the preparation protocol of the initial configurations. In particular, we reveal shear softening σ/P∼γ1/2 over an unprecedentedly wide range of strain up to the yielding point, which a simple scaling argument can rationalize.

DOI： 10.1103/physrevlett.132.268201

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その他リンク： http://harvest.aps.org/v2/journals/articles/10.1103/PhysRevLett.132.268201/fulltext

Anomalous fluctuations in homogeneous fluid phase of active Brownian particles 査読有り Open Access

Kuroda Y., Matsuyama H., Kawasaki T., Miyazaki K.

Physical Review Research 5 巻 ( 1 ) 2023年2月

掲載種別：研究論文（学術雑誌）出版者・発行元：Physical Review Research

Giant number fluctuations (GNF) are an anomaly universally observed in active fluids with polar or nematic order. In this paper, we show that GNF arise in the fluid phase of active Brownian particles (ABP), where the polar order is absent. GNF in ABP extends over a large but finite length which characterizes the growing velocity correlations. To suppress unwanted phase separation and allow ones to explore the disordered fluid phase at large activities, we impart the inertia, or the mass, to the ABP. A linearized hydrodynamic theory captures our findings, but only qualitatively. We find numerically a nontrivial scaling relation for the density correlation function, which the linearized theory cannot explain. The results suggest ubiquitousness of the anomalous fluctuations even in the disordered homogeneous fluid phase in the absence of the directional order.

DOI： 10.1103/physrevresearch.5.013077

その他リンク： http://harvest.aps.org/v2/journals/articles/10.1103/PhysRevResearch.5.013077/fulltext

Dynamical susceptibilities near ideal glass transitions Open Access

Laudicina C.C.L., Luo C., Miyazaki K., Janssen L.M.C.

Physical Review E 106 巻 ( 6 ) 2022年12月

掲載種別：研究論文（学術雑誌）出版者・発行元：Physical Review E

Building on the recently derived inhomogeneous mode-coupling theory, we extend the generalized mode-coupling theory of supercooled liquids to inhomogeneous environments. This provides a first-principles-based, systematic, and rigorous way of deriving high-point dynamical susceptibilities from variations of the many-body dynamic structure factors with respect to their conjugate field. This framework allows for a fully microscopic possibility to probe for collective relaxation mechanisms in supercooled liquids near the mode-coupling glass transition. The behavior of these dynamical susceptibilities is then studied in the context of simplified self-consistent relaxation models.

DOI： 10.1103/physreve.106.064136

Scopus

arXiv

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その他リンク： http://harvest.aps.org/v2/journals/articles/10.1103/PhysRevE.106.064136/fulltext

Dynamical Heterogeneity in Glass-Forming Liquids

Giulio Biroli, Kunimasa Miyazaki, David R. Reichman

2022年9月

Shear jamming and shear melting in mechanically trained frictionless particles

Takeshi Kawasaki, Kunimasa Miyazaki

2020年3月

We investigate criticality near the jamming transition in both quiescent
systems and those under shear by considering the effect of mechanical training
on the jamming transition and nonlinear rheology. We simulate frictionless soft
particles undergoing athermal quasi-static shear using initial configurations
trained with athermal quasi-static cyclic volume deformations. The jamming
transition density of the initial configuration $\varphi_{\rm J0}$ is
systematically altered by tuning the ``depth'' of mechanical training. We exert
a steady shear on these configurations and observe either shear jamming (gain
of stiffness due to shear) or shear melting (loss of stiffness due to shear),
depending on the depth of training and proximity to the jamming transition
density. We also observe that the characteristic strains, at which shear
jamming or melting occur, diverge at a unique density $\varphi_{\rm JS}$. This
is due to the shift of the jamming transition density from $\varphi_{\rm J0}$
to $\varphi_{\rm JS}$ under shear, associated with loss of memory of the
initial configuration. Finally, we thoroughly investigate nonlinear rheology
near the jamming transition density, and contrary to previous works, we find a
nonlinear ``softening'' takes place below as well as above the jamming
transition density.

arXiv

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その他リンク： http://arxiv.org/pdf/2003.10716v1

In Situ Measurement of Local pH at Working Electrodes in Neutral pH Solutions by the Rotating Ring-Disk Electrode Technique

Yokoyama Yuko, Miyazaki Kohei, Miyahara Yuto, Fukutsuka Tomokazu, Abe Takeshi

CHEMELECTROCHEM 6 巻 ( 18 ) 頁： 4750 - 4756 2019年9月

The Fredrickson-Andersen model with random pinning on Bethe lattices and its MCT transitions 査読有り

EPL 116 巻 ( 5 ) 頁： 56004 2017年1月

The Fredrickson-Andersen model with random pinning on Bethe lattices and its MCT transitions

Ikeda Harukuni, Miyazaki Kunimasa, Biroli Giulio

EPL 116 巻 ( 5 ) 頁： 56004 2016年12月

Cluster Glass Transition of Ultrasoft-Potential Fluids at High Density 査読有り

Ryoji Miyazaki, Takeshi Kawasaki, and Kunimasa Miyazaki

Phys. Rev. Lett. 117, 巻頁： 16570 2016年10月

Cluster Glass Transition of Ultrasoft-Potential Fluids at High Density

Miyazaki Ryoji, Kawasaki Takeshi, Miyazaki Kunimasa

PHYSICAL REVIEW LETTERS 117 巻 ( 16 ) 頁： 16570 2016年10月

Misaki Ozawa, Kang Kim, Kunimasa Miyazaki 招待有り査読有り

Misaki Ozawa, Kang Kim, Kunimasa Miyazaki

Journal of Statistical Mechanics: Theory and Experiment 頁： 074006 2016年7月

Misaki Ozawa, Kang Kim, Kunimasa Miyazaki 招待有り査読有り

Misaki Ozawa, Kang Kim, Kunimasa Miyazaki

Journal of Statistical Mechanics: Theory and Experiment 頁： 074006 2016年7月

Misaki Ozawa, Kang Kim, Kunimasa Miyazaki 招待有り査読有り

Misaki Ozawa, Kang Kim, Kunimasa Miyazaki

Journal of Statistical Mechanics: Theory and Experiment 頁： 074006 2016年7月

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<宮崎 州正>

論文 - 宮崎 州正

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論文 - 宮崎　州正