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General 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

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Quantum 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

Investigating Unitarity Violation of Lee–Wick’s Complex Ghost with Quantum Field Theory
2024119
Theories with fourthorder derivatives like Lee–Wick’s quantum electrodynamics model or quadratic gravity result in complex ghosts above a definite energy threshold that violate unitarity.
Theoretical Particle Physics

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Highly Accurate Estimation of Beta Decay Rates for Heavy Nuclei
2023117
Physicists from Japan present complete formulas that consider the induced current and velocitydependent terms for estimating the beta decay rates in heavy nuclei with high accuracy.
Nuclear physics

Discovering a Local Fluctuation Theorem with Machine Learning
20231020
A groundbreaking study reveals a new timelocal fluctuation theorem using machine learning, revolutionizing our understanding of deterministic nonequilibrium steady state systems.
Fundamental Theory of Condensed Matter Physics, Statistical Mechanics, Fluid Dynamics,
Statistical physics and thermodynamics
Measurement, instrumentation, and techniques

Going Beyond Einstein with Modified Theories of Gravity
202398
This study comprehends a way to probe modified theories of gravity on cosmological scales by combining theoretical advancements and observational data for upcoming cosmological observations.
Astrophysics, cosmology, and geophysics

Investigating Δ and Ω Baryons as Meson–Baryon Bound States in Lattice Quantum Chromodynamics
2023713
We investigate Δ and Ω baryons as meson–baryon bound states in lattice quantum chromodynamics and show that their difference results from the kinematic structure of the two meson–baryon systems, and not their interaction.
Theoretical Particle Physics

Novel Insights Into Bulk Reconstruction in the Antide Sitter/Conformal Field Theory Correspondence
202361
Bulk reconstruction in antide Sitter/conformal field theory is fundamental to our understanding of quantum gravity. We show that contrary to popular belief, bulk reconstruction is rather simple and intuitive.
Theoretical Particle Physics

The Stolz–Teichner Conjecture and Supermoonshine
2023425
We check the validity of the "divisibility property," predicted by the Stolz–Teichner conjecture, for several infinite families of theories built from Duncan’s Supermoonshine module. Along the way, we develop the tools necessary to construct the socalled "periodicity class."
Theoretical Particle Physics

A Closed Bosonic String Field Theory Based on the Fokker–Planck Formalism
2023411
A string field theory for closed bosonic strings is formulated using pants decomposition and the Fokker–Planck formalism.
Theoretical Particle Physics

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Pushing the Frontiers: On the Tenth Anniversary of Progress of Theoretical and Experimental Physics
2023330
The journal Progress of Theoretical and Experimental Physics (PTEP) celebrates its tenth (10th) anniversary in 2023. On this occasion, we take stock of some of its most notable publications.

Fractional Topological Charge Construction in a U(1) Lattice Gauge Theory Framework
2023327
We have constructed a fractional topological charge in the lattice Abelian gauge theory formalism, which avoids the issue of infinite degrees of freedom in continuum spacetime quantum field theory.
Theoretical Particle Physics

LiteBIRD: A New Frontier in the Search of Cosmic Inflation Imprint
2023322
The newly selected LiteBIRD satellite aims to detect cosmic inflation signals by identifying the imprint of primordial gravitational waves in the Cosmic Microwave Background polarization.
Astrophysics, cosmology, and geophysics

Theoretical Assessment of Fwave Bottom Mesons and Their Properties
20221124
We use heavy quark effective theory to study Fwave bottom mesons. Using theory and experimental data, we calculate their masses and analyze their decay widths to estimate the upper bound to the associated couplings.
Theoretical Particle Physics

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Towards a Better Understanding of the Shortrange Repulsive Nuclear Force
20221121
In a new study, researchers provide an experimental estimate of the shortrange repulsive nuclear force strength based on a highstatistics measurement of the differential crosssection for Σ^{+}p scattering.
Nuclear physics

Representations of KBc Algebra for Generating String Field Theory Solutions
20221031
We propose a general method for generating solutions in string field theory from a solution constructed using KBc algebra, and reproduce known solutions constructed earlier using different methods.
Theoretical Particle Physics

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Open String Field Theory Beyond Feynman Diagrams
202289
Theoretical physicists propose an alternative way of performing perturbative calculations in an open string field theory that has no analogy in the standard quantum field theory formalism.
Elementary particles, fields, and strings
Theoretical Particle Physics

PTEP SPECIAL SECTION
New Phases of Matter: Topological Physics in the 21^{st} Century
2022719
Researchers from Japan highlight in an editorial our current understanding of topological phases of matter, focusing on the classification of the newly discovered symmetry protected topological phases.
Theoretical Particle Physics
Fundamental Theory of Condensed Matter Physics, Statistical Mechanics, Fluid Dynamics,
Superconductivity

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Calculating Impedances for a Particle Accelerator
202277
In a new study, scientists provide a more comprehensive picture of dealing with the impedances of a twodimensional conductive cylindrical beam pipe with walls of finite thickness and spacecharge forces simultaneously.
Beam Physics

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Testing the Viability of Muon Accelerators
2022621
Researchers demonstrate the viability of a radiofrequency linear accelerator to accelerate stopped muons to the speed of light.
Experimental Particle Physics

Simulating Strongly Coupled Quantum Field Theory with Quantum Algorithms
2022527
Nonperturbative quantum field theory problems can often be difficult to solve with classical algorithms. Researchers now develop quantum computing algorithms to understand such problems in the Hamiltonian formalism.
Theoretical Particle Physics

Getting Around the Sign Problem to Solve an Open Quantum System
2022518
Researchers from Japan have found a novel nonequilibrium quantum system that doesn’t have the sign problem. The transport properties of the system are simulated with a Monte Carlo approach.
Elementary particles, fields, and strings
Theoretical Particle Physics

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Quantum Anomaly in a Dirac Fermion System with Spacetime Dependent Mass
2022427
Scientists investigate quantum anomalies in a system of Dirac fermions with spacetime dependent mass and show that the anomaly formulas can be expressed in terms of superconnections.
Theoretical Particle Physics
Elementary particles, fields, and strings

Calculating Superconformal Index of 𝓝 = 4 SuperYangMills Theory for Finite N
2022222
The examination of AdS/CFT correspondence for finite N, where quantum gravitational effects become important, reveals that finite N corrections for the superconformal index can be reproduced as D3 brane contributions.
Theoretical Particle Physics

New Classification Theory for Topological Gapless Superconducting Nodes
20211228
A new classification theory on topological superconducting gap nodes predicts two new gap structures emerging from a nonsymmorphic crystal symmetry and angular momentum.
Superconductivity

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Understanding Phase Transitions in Supersymmetric Quantum Electrodynamics With Resurgence Theory
20211125
Using resurgence theory to describe phase transitions in quantum field theory shows that information on nonperturbative effects like phase transitions can be obtained from a perturbative series expansion.
Theoretical Particle Physics

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A New Look at Our Universe with Gravitational Wave Astronomy
20211026
A new interdisciplinary collaborative project underscores the importance of combining theory with advanced observation techniques to understand gravitational waves and their sources, opening doors to new discoveries about the universe.
Astrophysics, cosmology, and geophysics

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Estimating Beta Decay Rates Better for Exotic Nuclei
2021101
Physicists from Japan demonstrate an improved estimation of the beta decay rate in heavy nuclei by considering nexttoleadingorder approximation for the electron wave function distorted by the Coulomb potential.
Nuclear physics

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Designing a New Spaceborne Interferometer to Probe the History of Our Universe
2021922
Scientists present a new design for a spaceborn laser interferometer that could detect gravitational waves below 10 Hz, letting us probe into new astrophysical phenomena.
Astrophysics, cosmology, and geophysics

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Generalizing 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 SECTION
Atoms 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.
Mathematical methods, classical and quantum physics, relativity, gravitation, numerical simulation, computational modeling
Gases, plasmas, electric discharges, accelerators, and beams

PTEP SPECIAL SECTION
Nonreal Energies with Real Effects in Exotic Condensed Matter Systems
2021719
Scientists demonstrate the presence of nonHermitian topological properties preserved under continuous physical deformations in strongly correlated systems in equilibrium, resulting from shortlived quanta of collective excitations.
Electron states in condensed matter

PTEP SPECIAL SECTION
A 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.
Mathematical methods, classical and quantum physics, relativity, gravitation, numerical simulation, computational modeling
Nuclear physics
Electron states in condensed matter
Gases, plasmas, electric discharges, accelerators, and beams

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Using Pulsed Cold Neutrons to Measure Neutron Lifetime
2021713
Scientists measure the lifetime of a neutron with pulsed neutron beams to explore the cause of a puzzling discrepancy in their previously measured lifetime.
Elementary particles, fields, and strings

Simulating Equilibrium Behavior of Quantum Fields with Timeevolving Classical Fields
202145
A set of field configurations (replicas) reaches equilibrium of quantum field theory after realtime evolution obeying classical equations of motion.
Elementary particles, fields, and strings

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

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Antimatter Matters: Making Sense of the Matter–Antimatter Asymmetry at Japan’s BelleII Facility
2021322
Scientists embark on a quest to unravel the mysteries behind matter–antimatter asymmetry in our universe with the new BelleII experiment at the SuperKEKB accelerator in Japan.
Elementary particles, fields, and strings

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The Thin Edge of Entanglement Wedges and Progress in Quantum Gravity
2021315
Scientists for the first time theoretically link quantum states and gravity, taking one step further in understanding the origins of gravity and opening doors to novel quantum applications.
Elementary particles, fields, and strings

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New Findings Hint Towards Existence of Kaonic Nuclei and Hypernuclei
202133
Scientists reveal a new feature in nuclear physics: the existence of kaonic nuclei and hypernuclei. These findings can enhance our understanding of nature and contribute to technological progress.
Nuclear physics

What Happened to Antimatter?
202133
The BelleII experiment is designed to explore new mechanisms of matterantimatter asymmetry that may resolve the mystery behind the dominance of matter over antimatter in the universe.
Elementary particles, fields, and strings