FieldsMathematical methods, classical and quantum physics, relativity, gravitation, numerical simulation, computational modeling

NEWA Promising Solution to Nucleon–Nucleon Inverse Scattering Problem
2024107
This study deals with the inverse elastic twobody quantum scattering problem using Volterra approximations and neural networks, offering a novel approach for solving complex nonlinear systems.
General and Mathematical Physics
Mathematical methods, classical and quantum physics, relativity, gravitation, numerical simulation, computational modeling
Nuclear physics

PICKUPA New Method for Finding Bound States in the Continuum
2024101
This study presents a general theory for constructing potentials supporting bound states in the continuum, offering a method for identifying such states in real quantum systems.General and Mathematical Physics
Mathematical methods, classical and quantum physics, relativity, gravitation, numerical simulation, computational modeling
Nuclear physics

PICKUPGeneral QuasiJoint Probabilities on FiniteState Quantum Systems
2024815
This study investigates the properties of general quasijoint probability distributions in finitestate quantum systems, revealing the KirkwoodDirac distribution as among the most favorable. This highlights the importance of complex distributions in understanding quantum probability.
Mathematical methods, classical and quantum physics, relativity, gravitation, numerical simulation, computational modeling

Solving a Stochastic Differential Equation is Solving a MeanField Quantum Spin System
2024516
The replica method maps matrixvalued geometric Brownian motion to a meanfield quantum spin system. This correspondence makes it possible to obtain an exact solution for matrixvalued geometric Brownian motion.
Magnetic properties in condensed matter
Mathematical methods, classical and quantum physics, relativity, gravitation, numerical simulation, computational modeling
Statistical physics and thermodynamics

PICKUPQuantum Mechanics of OneDimensional ThreeBody Contact Interactions
2024213
The quantum mechanical description of topologically nontrivial threebody contact interactions in one dimension is not well understood. This study explores the Hamiltonian description of these interactions using the pathintegral formalism.
Mathematical methods, classical and quantum physics, relativity, gravitation, numerical simulation, computational modeling
Theoretical Particle Physics

PICKUPExploring Recent Advances in the Physics of Biofluid Locomotion
2023128
This Special Topics Edition of the JPSJ describes the latest advances in the field of biofluid locomotion, shedding light on the underlying physics behind the movement of organisms that swim and fly.
Crossdisciplinary physics and related areas of science and technology
Electromagnetism, optics, acoustics, heat transfer, and classical and fluid mechanics
Mathematical methods, classical and quantum physics, relativity, gravitation, numerical simulation, computational modeling
Measurement, instrumentation, and techniques
Statistical physics and thermodynamics
Structure and mechanical and thermal properties in condensed matter

Topological Properties of the Periodic Toda Lattice: Analogy with the Thouless Pump
202388
We find that the periodic Toda lattice belongs to the same topological class as the Thouless pump.
Electronic structure and electrical properties of surfaces and nanostructures
Mathematical methods, classical and quantum physics, relativity, gravitation, numerical simulation, computational modeling

PICKUPTowards a New Phase in Materials Science with Hyperordered Structures
202351
A Special Topics edition of the Journal of the Physical Society of Japan features articles discussing recent advancements in hyperordered structures in materials, their applications, and the techniques for observing them.
Atomic and molecular physics
Crossdisciplinary physics and related areas of science and technology
Dielectric, optical, and other properties in condensed matter
Electron states in condensed matter
Mathematical methods, classical and quantum physics, relativity, gravitation, numerical simulation, computational modeling
Structure and mechanical and thermal properties in condensed matter

PICKUPTensor Networks Across Physics
202267
Researchers from Japan provide the first comprehensive review of the historical development of tensor networks from a statistical mechanics viewpoint, with a focus on its theoretical background.
Magnetic properties in condensed matter
Mathematical methods, classical and quantum physics, relativity, gravitation, numerical simulation, computational modeling
Statistical physics and thermodynamics

A Twostep Creation of Phonon Entanglement with Quantized Light
20211228
Dynamics of photoinduced quantum entanglement generation between phonons is theoretically revealed. The results contribute to the study of fundamental theoretical problems within quantum dynamics of photoinduced phase transitions and quantum information science.
Dielectric, optical, and other properties in condensed matter
Electromagnetism, optics, acoustics, heat transfer, and classical and fluid mechanics
Mathematical methods, classical and quantum physics, relativity, gravitation, numerical simulation, computational modeling

PICKUPGeneralizing Poisson Algebra with Geometry
202196
Using a differential geometric interpretation of Hamiltonian mechanics, a generalized Poisson bracket formulation is developed for a threedimensional phase space characterized by a triplet of canonical variables.
Mathematical methods, classical and quantum physics, relativity, gravitation, numerical simulation, computational modeling

PTEP SPECIAL SECTIONAtoms Trapped with Light Behave Like a Dissipative Quantum System
2021719
A team of researchers from Japan experimentally realize, for the first time, a dissipative, paritytime symmetric, manybody quantum system from ultracold atoms trapped in an optical lattice.Gases, plasmas, electric discharges, accelerators, and beams
Mathematical methods, classical and quantum physics, relativity, gravitation, numerical simulation, computational modeling

PTEP SPECIAL SECTIONA Quantum Description of Physical Systems with Nonreal Energies
2021719
While quantum systems are traditionally described by Hermitian Hamiltonians, the formalism is extendable to a nonHermitian description for systems that are dissipative or obey paritytime symmetry.Electron states in condensed matter
Gases, plasmas, electric discharges, accelerators, and beams
Mathematical methods, classical and quantum physics, relativity, gravitation, numerical simulation, computational modeling
Nuclear physics

PICKUPRandom Numbers Can Help Solve Difficult Problems in Manybody Physics
2021329
Theorists review a random state vectorbased description of quantum manybody systems which helps greatly reduce the computational burden involved in their numerical simulations, opening doors to applications in quantum computing.
Electronic transport in condensed matter
Magnetic properties in condensed matter
Mathematical methods, classical and quantum physics, relativity, gravitation, numerical simulation, computational modeling

A New Approach to Solving Periodic Differential Systems
2021329
Mathematicians and physicists are well acquainted with secondorder ordinary differential equations (ODE), the most prominent of them being the class of equations that govern oscillatory motion.
Mathematical methods, classical and quantum physics, relativity, gravitation, numerical simulation, computational modeling

PICKUP
Hybrid Quantum–Classical Algorithms: At the Verge of Useful Quantum Computing
2021322
Scientists discuss the recent progress in algorithms that have enabled hybrid quantum–classical computers, which has brought the quest to realize useful quantum computing much closer to its finish line.
Crossdisciplinary physics and related areas of science and technology
Mathematical methods, classical and quantum physics, relativity, gravitation, numerical simulation, computational modeling

Solving Quantum Equations with Gauge Fields: How Explicit Integrators Based on a Bipartite Lattice and Affine Transformations Can Help
2021315
We proposed an explicit numerical integrator consisting of affine transformation pairs resulting from the checkerboard lattice for spatial discretization. It can efficiently solve time evolution equations that describe dynamical quantum phenomena under gauge fields, e.g., generation, motion, interaction of quantum vortices in superconductors or superfluids.
Mathematical methods, classical and quantum physics, relativity, gravitation, numerical simulation, computational modeling
Superconductivity