53 citations · 192 across the 16 of their papers we have counts for
17 papers
Potential energy landscape picture of zero-temperature avalanche criticality governing dynamics in supercooled liquids
Norihiro Oyama, Yusuke Hara, Takeshi Kawasaki +1
Supercooled liquids are metastable states realized by suppressing crystallization below the melting temperature. While it is well established that their dynamics slow down dramatic…
Zero-temperature Avalanche Criticality Governing Dynamical Heterogeneity in Supercooled Liquids
Norihiro Oyama, Yusuke Hara, Takeshi Kawasaki +1
In supercooled liquids, mesoscale mobile and immobile domains are ubiquitously observed, a phenomenon known as dynamical heterogeneity. Extensive studies have established that the…
Scale Separation of Shear-induced Criticality in Glasses
Norihiro Oyama, Takeshi Kawasaki, Kang Kim +1
In a sheared steady state, glasses reach a nonequilibrium criticality called yielding. In this letter, we report that the qualitative nature of this nonequilibrium critical phenome…
What Do Deep Neural Networks Find in Disordered Structures of Glasses?
Norihiro Oyama, Shihori Koyama, Takeshi Kawasaki
Glass transitions are widely observed in various types of soft matter systems. However, the physical mechanism of these transitions remains {elusive}, despite years of ambitious re…
Shear-induced Criticality in Glasses Shares Qualitative Similarities with the Gardner Phase
Norihiro Oyama, Hideyuki Mizuno, Atsushi Ikeda
Although glass phases are found in various soft matter systems ubiquitously, we are still far from a complete understanding of them. The concept of marginal stability predicted by…
Localized and extended dynamical correlation lengths in jammed packings of soft athermal disks under slow shear
Shoichi Takahata, Norihiro Oyama, Kuniyasu Saitoh
Dynamics of jammed packings of soft athermal disks under finite-rate shear are studied by means of molecular dynamics simulations. Particularly, we investigate the spatial structur…
Dynamic susceptibilities in dense soft athermal spheres under a finite-rate shear
Norihiro Oyama, Takeshi Kawasaki, Kuniyasu Saitoh
The mechanical responses of dense packings of soft athermal spheres under a finite-rate shear are studied by means of molecular dynamics simulations. We investigate the volume frac…
Instantaneous Normal Modes Reveal Structural Signatures for the Herschel-Bulkley Rheology in Sheared Glasses
Norihiro Oyama, Hideyuki Mizuno, Atsushi Ikeda
The Herschel-Bulkley law, a universal constitutive relation, has been empirically known to be applicable to a vast range of soft materials, including sheared glasses. Although the…
Gas-liquid phase separation at zero temperature: mechanical interpretation and implications for gelation
Masanari Shimada, Norihiro Oyama
The relationship between glasses and gels has been intensely debated for decades; however, the transition between these two phases remains elusive. To investigate a gel formation p…
Unified View of Avalanche Criticality in Sheared Glasses
Norihiro Oyama, Hideyuki Mizuno, Atsushi Ikeda
Plastic events in sheared glasses are considered an example of so-called avalanches, whose sizes obey a power-law probability distribution with the avalanche critical exponent .…
Glassy dynamics of a model of bacterial cytoplasm with metabolic activities
Norihiro Oyama, Takeshi Kawasaki, Hideyuki Mizuno +1
Recent experiments have revealed that cytoplasms become glassy when their metabolism is suppressed, while they maintain fluidity in a living state. The mechanism of this active flu…
Transition rates for slip-avalanches in soft athermal disks under quasi-static simple shear deformations
Kuniyasu Saitoh, Norihiro Oyama, Fumiko Ogushi +1
We study slip-avalanches in two-dimensional soft athermal disks by quasi-static simulations of simple shear deformations. Sharp drops in shear stress, or slip-avalanches, are obser…
Avalanche Interpretation of the Power-Law Energy Spectrum in Three-Dimensional Dense Granular Flow
Norihiro Oyama, Hideyuki Mizuno, Kuniyasu Saitoh
Turbulence is ubiquitous in nonequilibrium systems, and it has been noted that even dense granular flows exhibit characteristics that are typical of turbulent flow, such as the pow…
Hydrodynamic synchronization of externally driven colloids
Norihiro Oyama, Kosuke Teshigawara, John Jairo Molina +2
The collective dynamics of externally driven -colloidal systems () in a confined viscous fluid have been investigated using three-dimensional direct…
Hydrodynamic alignment of microswimmers in pipes
Norihiro Oyama, John Jairo Molina, Ryoichi Yamamoto
We investigate the dynamics of model microswimmers under confinement, in cylindrical geometries, by means of three dimensional direct numerical calculations with fully resolved hyd…
Do hydrodynamically assisted binary collisions lead to orientational ordering of microswimmers?
Norihiro Oyama, John Jairo Molina, Ryoichi Yamamoto
We have investigated the onset of collective motion in systems of model microswimmers, by performing a comprehensive analysis of the binary collision dynamics using three dimension…
Purely hydrodynamic origin for swarming of swimming particles
Norihiro Oyama, John Jairo Molina, Ryoichi Yamamoto
Three-dimensional simulations with fully resolved hydrodynamics are performed to study the collective motion of model swimmers in confinement. We show that certain swimming mechani…