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A pseudoclassical theory for the wavepacket dynamics of the kicked rotor model

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Science China(physics,Mechanics & Astronomy) 2024年第3期67卷 34-43页

作者： Zhixing Zou Jiao Wang Department of physics and Key Laboratory of Low Dimensional Condensed Matter physics(Department of Education of Fujian Province) Xiamen UniversityXiamen 361005China lanzhou center for theoretical physics Lanzhou UniversityLanzhou 730000China

In this study, we propose a generalized pseudoclassical theory for the kicked rotor model in an attempt to discern the footprints of the classical dynamics in the deep quantum regime. Compared with the previous pseudoclassical theory that applies only in the neighborhoods of the lowest two quantum resonances, the proposed theory is applicable in the neighborhoods of all quantum resonances in principle by considering the quantum effect of the free rotation at a quantum resonance. In particular, it is confirmed by simulations that the quantum wavepacket dynamics can be successfully forecasted based on the generalized pseudoclassical dynamics, offering an intriguing example where it is feasible to bridge the dynamics in the deep quantum regime to the classical dynamics. The application of the generalized pseudoclassical theory to the PT-symmetric kicked rotor is also discussed.

关键词： quantum-classical correspondence kicked rotor model pseudoclassical theory wavepacket dynamics

Critical Opalescence and Its Impact on the Jet Quenching Parameter q

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Chinese physics Letters 2024年第3期41卷 23-29页

作者：武警曹杉杉李峰 School of Physical Science and Technology Lanzhou UniversityLanzhou 730000China Institute of Frontier and Interdisciplinary Science Shandong UniversityQingdao 266237China Research center for Hadron and CSR physics Lanzhou University and Institute of Modern Physics of CASLanzhou 730000China lanzhou center for theoretical physics Key Laboratory of Theoretical Physics of Gansu Provinceand Frontiers Science Center for Rare IsotopesLanzhou UniversityLanzhou 730000China Frontiers Science center for Rare Isotopes Lanzhou UniversityLanzhou 730000China

Jet quenching parameter q is essential for characterizing the interaction strength between jet partons and nuclear matter.Based on the quark-meson model,we develop a new framework for calculating q at finite chemical ... 详细信息

关键词： parameter quark calculating

Gravitational form factors of the proton from near-threshold vector meson photoproduction

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Chinese physics C 2024年第5期48卷 226-234页

作者：王晓云曾凡聪张纪元 Department of physics Lanzhou University of TechnologyLanzhou 730050China lanzhou center for theoretical physics Key Laboratory of Theoretical Physics of Gansu Provinceand Key Laboratory of Quantum Theory and Applications of MoELanzhou UniversityLanzhou 730000China Institute of High Energy physics Chinese Academy of SciencesBeijing 100049China University of Chinese Academy of Sciences Beijing 100049China

We systematically analyze the quark and gluon gravitational form factors(GFFs)of the proton by connecting the energy-momentum tensor and near-threshold vector meson photoproduction(NTVMP).Specifically,the quark contributions of GFFs are determined by applying global fitting to the cross section of the lightest vector mesonρ0 photoproduction.Combined with the gluon GFFs obtained from heavy quarkonium J/ψphotoproduction data,the complete GFFs are obtained and compared with the experimental results and lattice quantum chromodynamics determinations.In addition,we use the resonance via Padé(RVP)method based on the Schlessinger point method to obtain a model-independent quark D-term distribution through direct analytical continuation of deeply virtual Compton scattering experimental data.If errors are considered,the results obtained with RVP are essentially consistent with those obtained by NTVMP.Moreover,the comprehensive information on GFFs helps to uncover the mass distribution and mechanical properties inside the proton.This study is not only an important basis for delving into the enigmatic properties of the proton,but also has significance for theoretically guiding future JLab and EIC experimental measurements.

关键词： gravitational form factors properties of the proton vector mesonphotoproduction Schlessinger point method

Cooperative activation of sodium channels for downgrading the energy efficiency in neuronal information processing

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Chinese physics B 2024年第5期33卷 758-763页

作者：严浩然颜家琦俞连春邵玉峰 School of Physical Science and Technology Lanzhou Center for Theoretical PhysicsLanzhou UniversityLanzhou 730000China Key Laboratory of theoretical physics of Gansu Province and Key Laboratory of Quantum Theory and Applications of MoELanzhou UniversityLanzhou 730000China Department of Neuroscience AnatomyHistologyand EmbryologyKey Laboratory of Preclinical Study for New Drugs of Gansu ProvinceSchool of Basic Medical SciencesLanzhou UniversityLanzhou 730000China

The Hodgkin–Huxley model assumes independent ion channel activation,although mutual interactions are common in biological systems.This raises the problem why neurons would favor independent over cooperative channel activation.In this study,we evaluate how cooperative activation of sodium channels affects the neuron’s information processing and energy consumption.Simulations of the stochastic Hodgkin–Huxley model with cooperative activation of sodium channels show that,while cooperative activation enhances neuronal information processing capacity,it greatly increases the neuron’s energy consumption.As a result,cooperative activation of sodium channel degrades the energy efficiency for neuronal information processing.This discovery improves our understanding of the design principles for neural systems,and may provide insights into future designs of the neuromorphic computing devices as well as systematic understanding of pathological mechanisms for neural diseases.

关键词： energy efficiency ion channel noise action potential generation neuronal dynamics

Localization of q-form fields on a de Sitter brane in chameleon gravity

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Frontiers of physics 2024年第3期19卷 11-18页

作者： Yi Zhong Tao-Tao Sui School of physics and Electronics Science Hunan UniversityChangsha 410082China lanzhou center for theoretical physics Key Laboratory of Theoretical Physics of Gansu Provinceand Key Laboratory of Quantum Theory and Applications of MoELanzhou UniversityLanzhou 730000China College of physics Nanjing University of Aeronautics and AstronauticsNanjing 211106China

Recently,it was found that the vector field can be naturally localized on the thick brane in chameleon gravity.In this work,we extend this study to encompass de Sitter brane scenario.We focus on the localization of q-form fields.The scalar and vector fields can be localized on the de Sitter brane,while the KR field cannot be localized.The condition for localization of the scalar and vector fields is obtained.Furthermore,we investigate the localization characteristics in two examples with given conformal factor b(ϕ).In the first case,the effective potentials and KK modes of the matter fields are obtained asymmetric even though the de Sitter brane has Z2 symmetry.In the second case,volcano-like effective potentials are generated in the de Sitter brane model.

关键词： brane q-form field chameleon gravity

Molecular components in J/ψandρ-πpuzzle

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Chinese physics C 2024年第5期48卷 141-150页

作者：郭星导陈殿勇李学潜苑仲元桑士晶 College of physics and New Energy Xuzhou University of TechnologyXuzhou 221111China School of physics Southeast UniversityNanjing 211189China Department of physics Nankai UniversityTianjin 300071China lanzhou center for theoretical physics Lanzhou UniversityLanzhou 730000China

Motivated by the large branching fractions of J/ψ→f0(1710)ω/f0(1710)ϕand the light exotic candidates,we found that there may exist molecular states composed of f0(1710)ωand f0(1710)ϕ,which correspond to X(2440)and X(2680)observed a few decades ago.The branching fractions of X(2440)and X(2680)to various PV and KKω(ϕ)channels were estimated in the molecular scenario.In addition,the large branching fractions of J/ψ→f0(1710)ω/f0(1710)ϕindicate sizable molecular components in the J/ψstate.Thus,we consider J/ψas the superposition of thecc¯(1S),f0(1710)ω,and f0(1710)ϕmolecular states.These molecular components have a significant impact on the light hadron decays of J/ψ,which may elucidate the long standingρ−πpuzzle.

关键词： ρ-πpuzzle J/ψ molecular state

Photon orbits and phase transition for Letelier AdS black holes immersed in perfect fluid dark matter

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Chinese physics C 2024年第6期48卷 247-259页

作者： Ashima Sood Md Sabir Ali J.K.Singh Sushant G.Ghosh Department of Mathematics Netaji Subhas University of TechnologyNew Delhi-110078India Centre for theoretical physics Jamia Millia IslamiaNew Delhi 110025India Department of physics Mahishadal Raj CollegePurba MedinipurWest Bengal721628India Institute of theoretical physics&Research center of Gravitation Lanzhou UniversityLanzhou 730000China Key Laboratory of Quantum Theory and Applications of MoE Lanzhou UniversityLanzhou 730000China lanzhou center for theoretical physics&Key Laboratory of theoretical physics of Gansu Province Lanzhou UniversityLanzhou 730000China Astrophysics and Cosmology Research Unit School of MathematicsStatistics and Computer ScienceUniversity of KwaZulu-NatalPrivate Bag X54001Durban 4000South Africa

We obtain an exact solution for spherically symmetric Letelier AdS black holes immersed in perfect fluid dark matter(PFDM).Considering the cosmological constant as the positive pressure of the system and volume as its conjugate variable,we analyze the thermodynamics of our black holes in the extended phase space.Owing to the background clouds of strings parameter(a)and the parameter endowed with PFDM(β),we analyze the Hawking temperature,entropy,and specific heat.Furthermore,we investigate the relationship between the photon sphere radius and phase transition for the Letelier AdS black holes immersed in PFDM.Through the analysis,with a particular condition,non-monotonic behaviors are found between the photon sphere radius,impact parameter,PFDM parameter,temperature,and pressure.We can regard the changes in both the photon sphere radius and impact parameter before and after phase transition as the order parameter;their critical exponents near the critical point are equal to the same value,1/2,similar to that in ordinary thermal systems.This indicates that a universal relation of gravity may exist near the critical point for a black hole thermodynamic system.

关键词： AdS black holes perfect fluid dark matter Letelier spacetime photon orbit extended phase space thermodynamics correlation of photon orbit and thermodynamics

Critical Opalescence and Its Impact on the Jet Quenching Parameter ■

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Chinese physics Letters 2024年第3期41卷 28-34页

作者：武警曹杉杉李峰 School of Physical Science and Technology Lanzhou University Institute of Frontier and Interdisciplinary Science Shandong University Research center for Hadron and CSR physics Lanzhou University and Institute of Modern Physics of CAS lanzhou center for theoretical physics Key Laboratory of Theoretical Physics of Gansu Provinceand Frontiers Science Center for Rare Isotopes Lanzhou University Frontiers Science center for Rare Isotopes Lanzhou University

Jet quenching parameter ■ is essential for characterizing the interaction strength between jet partons and nuclear matter. Based on the quark-meson model, we develop a new framework for calculating ■ at finite chemi...

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Thermodynamic limits on neural information processing efficiency

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Science China(physics,Mechanics & Astronomy) 2024年第6期67卷 183-183页

作者： Lianchun Yu School of Physical Science and Technology Lanzhou Center for Theoretical PhysicsKey Laboratory of Theoretical Physics of Gansu Provinceand Key Laboratory of Quantum Theory and Applications of MoELanzhou UniversityLanzhou 730000China

In What is Life?,Schr?dinger defined life as processes maintaining negative entropy.His ideas highlighted physics’ability to interpret complex biological systems,including the human brain.Following in this scientific lineage,a field that seeks to understand brain design,function,and capacities from the perspective of fundamental physical laws has emerged.Specifically,the energy efficiency hypothesis suggests evolutionary pressures shaped neural systems to maximize information processing per energy unit.

关键词： entropy shaped hypothesis