6 papers
Geometric Thermodynamics of Scallop Motion with Two Control Parameters
Hisao Hayakawa
According to Purcell's scallop theorem, reciprocal single-degree-of-freedom shape deformations cannot achieve net propulsion in a viscous fluid. We show that this limitation is byp…
Non-Hermitian Random Matrix Theory of Jamming in Active Disordered Media
Hisao Hayakawa
We develop a theoretical framework for the mechanics of active jammed systems based on non-Hermitian random matrix theory. Starting from a microscopic model of active particles wit…
Quantum tunneling Mpemba effect
Hisao Hayakawa, Satoshi Takada
We investigate a quantum tunneling Mpemba effect for a particle in a continuous one-dimensional symmetric double-well potential subject to irreversible boundary loss. The dissipati…
Mpemba effect in a two-dimensional bistable potential
Hisao Hayakawa, Satoshi Takada
We present an exactly solvable model of the Mpemba effect in an overdamped Langevin system confined to a two-dimensional, radially symmetric bistable potential. The potential is co…
Early-stage impact dynamics in dense suspensions of millimeter-sized particles
Hirokazu Maruoka, Hisao Hayakawa
This study investigates the phenomenon of the early-stage dynamics of impact-induced hardening in dense suspensions, where materials undergo solidification upon impact. While Stoke…
Multiple quantum Mpemba effect: exceptional points and oscillations
Amit Kumar Chatterjee, Satoshi Takada, Hisao Hayakawa
We explore the role of exceptional points and complex eigenvalues on the occurrence of the quantum Mpemba effect. To this end, we study a two-level driven dissipative system subjec…