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Applying deep learning technique to chiral magnetic wave search

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Chinese physics C 2024年第8期48卷 170-176页

作者： Yuan-Sheng Zhao Xu-Guang Huang physics Department and center for Particle physics and Field Theory Fudan UniversityShanghai 200433China Key Laboratory of Nuclear physics and Ion-beam Application(MOE) Fudan UniversityShanghai 200433China Shanghai Research center for theoretical Nuclear physics National Natural Science Foundation of China and Fudan UniversityShanghai 200438China

The chiral magnetic wave(CMW)is a collective mode in quark-gluon plasma originated from the chiral magnetic effect(CME)and chiral separation *** detection in heavy-ion collisions is challenging owing to significant background ***[*** et al.,***.C 106,L051901(2022)],we constructed a neural network that accurately identifies the CME-related signal from the final-state pion *** this study,we have generalized this neural network to the case of CMW *** show that,after an updated training,the neural network effectively recognizes the CMW-related ***,we have assessed the performance of the neural network in comparison with other known methods for CMW search.

关键词： deep learning chiral magnetic wave relativistic heavy-ion collisions

Reveal the lost entanglement for accelerated atoms in the high-dimensional spacetime

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Science China(physics,Mechanics & Astronomy) 2024年第6期67卷 48-57页

作者： Jiatong Yan Baocheng Zhang Qingyu Cai School of Mathematics and physics China University of GeosciencesWuhan 430074China physics Department Brown UniversityProvidenceRhode Island 02912USA center for theoretical physics Hainan UniversityHaikou 570228China School of Information and Communication Engineering Hainan UniversityHaikou 570228China Peng Huanwu center for Fundamental Theory Hefei 230026China

When atoms are accelerated in the vacuum,entanglement among atoms will degrade compared with the initial situation before the *** this study,we propose a novel and interesting view that the lost entanglement can be recovered completely when the high-dimensional spacetime is exploited,in the case that the acceleration is not too large,since the entanglement loss rate caused by the large acceleration is faster than the recovery *** also calculate the entanglement change caused by the anti-Unruh effect and found that the lost entanglement could just be recovered part by the anti-Unruh effect,and the anti-Unruh effect could only appear for a finite range of acceleration when the interaction time scale is approximately shorter than the reciprocal of the energy gap in two dimensional *** limit case of zero acceleration is also investigated,which gives an analytical interpretation for the increase or recovery of entanglement.

关键词： entanglement acceleration high-dimensional spacetime

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Primordial black holes and curvature perturbations from false vacuum islands

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Science China(physics,Mechanics & Astronomy) 2024年

作者： Rong-Gen Cai Yu-Shi Hao Shao-Jiang Wang School of Physical Science and Technology Ningbo University CAS Key Laboratory of theoretical physics Institute of Theoretical Physics Chinese Academy of Sciences School of Physical Sciences University of Chinese Academy of Sciences Asia Pacific center for theoretical physics

Recently, much attention has been focused on the false vacuum islands that are flooded by an expanding ocean of true-vacuum bubbles slightly later than most of the other parts of the world. These delayed decay regions will accumulate locally larger vacuum energy density by staying in the false vacuum longer than those already transited into the true vacuum. A false vacuum island with thus acquired density contrast of a super-horizon size will evolve locally from radiation dominance to vacuum dominance, creating a local baby universe that can be regarded effectively as a local closed universe. If such density contrasts of super-horizon sizes can ever grow large enough to exceed the threshold of gravitational collapse, primordial black holes will form similar to those collapsing curvature perturbations on super-horizon scales induced by small-scale enhancements during *** not, such density contrasts can still induce curvature perturbations potentially observable today. In this paper, we revisit and elaborate on the generations of primordial black holes and curvature perturbations from delayed-decayed false vacuum islands during asynchronous first-order phase transitions with fitting formulas convenient for future model-independent studies.

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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 *** to the background clouds of strings parameter(a)and the parameter endowed with PFDM(β),we analyze the Hawking temperature,entropy,and specific ***,we investigate the relationship between the photon sphere radius and phase transition for the Letelier AdS black holes immersed in *** the analysis,with a particular condition,non-monotonic behaviors are found between the photon sphere radius,impact parameter,PFDM parameter,temperature,and *** 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 *** 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

Determination of the resonant parameters ofχ_(c0)(3915)with global fit

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Chinese physics C 2024年第6期48卷 1-4页

作者：李春花王希俊吴晨 Department of physics and Electronic Technology Liaoning Normal UniversityDalian 116029China center for theoretical and Experimental High Energy physics Liaoning Normal UniversityDalian 116029China

Particle χ_(c0)(3915) was first observed by the Belle experiment in the ωJ/ψ invariant mass spectrum in the process B→KωJ/ψ and subsequently confirmed by the BaBar *** experiments reported the resonant parameters of this particle in the processes γγ→ωJ/ψ and B→KωJ/ψ assuming χ_(c0)(3915) as an S-wave Breit-Wigner *** performed a global fit to the distributions of invariant mass of ωJ/ψ measured by the Belle and BaBar experiments and additionally incorporated the measurements reported by the LHCb experiment to extract the mass and width of χ_(c0)(3915).We obtained M=3920.9±0.9 MeV/c^(2) and Γ=18.2±2.4 MeV,which are consistent with the values from PDG within one standard deviation but with higher precision.

关键词： charmonimum-like state χ_(c0)(3915) global fit mass width

Regulating the dopant clustering in LiZnAs-based diluted magnetic semiconductor

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Chinese physics B 2024年第5期33卷 617-623页

作者：贾子航周波姜振益张小东 Institute of Modern physics Northwest UniversityXi'an 710069China Shaanxi Key Laboratory for theoretical physics Frontiers Northwest UniversityXi'an 710069China Department of physics Chinese University of Hong KongHong Kong SARChina Beijing Computational Science Research center Beijing 100193China

Tuning of the magnetic interaction plays the vital role in reducing the clustering of magnetic dopant in diluted magnetic semiconductors(DMS).Due to the not well understood magnetic mechanism and the interplay between different magnetic mechanisms,no efficient and universal tuning strategy is proposed at ***,the magnetic interactions and formation energies of isovalent-doped(Mn) and aliovalent(Cr)-doped LiZnAs are studied based on density functional theory(DFT).It is found that the dopant–dopant distance-dependent magnetic interaction is highly sensitive to the carrier concentration and carrier type and can only be explained by the interplay between two magnetic mechanisms,i.e.,superexchange and Zener’s p–d exchange ***,the magnetic behavior and clustering of magnetic dopant can be tuned by the interplay between two magnetic *** insensitivity of the tuning effect to U parameter suggests that our strategy could be universal to other DMS.

关键词： diluted magnetic semiconductor dopant distribution first-principles calculations

Thermal-contact capacity of one-dimensional attractive Gaudin-Yang model

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Chinese physics B 2024年第4期33卷 231-235页

作者：张小敏程颂陈洋洋 Institute of Modern physics Northwest UniversityXi'an 710069China Beijing Computational Science Research center Beijing 100193China Peng Huanwu center for Fundamental Theory Northwest UniversityXi'an 710069China Shaanxi Key Laboratory for theoretical physics Frontiers Northwest UniversityXi'an 710069China

Tan's contact C is an important quantity measuring the two-body correlations at short distances in a dilute *** we make use of the technique of exactly solved models to study the thermal-contact capacity K_(T),i.e.,the derivative of C with respect to temperature in the attractive Gaudin-Yang *** is found that K_(T) is useful in identifying the low temperature phase diagram,and using the obtained analytical expression of K_(T),we study its critical behavior and the scaling ***,we show K_(T) versus temperature and thus the non-monotonic tendency of C in a tiny interval,for both spin-balanced and imbalanced *** a phenomenon is merely observed in multi-component systems such as SU(2)Fermi gases and spinor bosons,indicating the crossover from the Tomonaga-Luttinger liquid to the spin-coherent liquid.

关键词： Tan's Contact Gaudin-Yang model Bethe ansatz

Cosmological constraints on neutrino mass within consistent cosmological models

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Chinese physics C 2024年第6期48卷 191-197页

作者：庞业煌张雪黄庆国 School of Fundamental physics and Mathematical Sciences Hangzhou Institute for Advanced StudyUCASHangzhou 310024China School of Physical Sciences University of Chinese Academy of SciencesBeijing 100049China CAS Key Laboratory of theoretical physics Institute of Theoretical PhysicsChinese Academy of SciencesBeijing 100190China center for Gravitation and Cosmology College of Physical Science and TechnologyYangzhou UniversityYangzhou 225009China

Recently,the emergence of cosmological tension has raised doubts about the consistency of the ACDM *** constrain the neutrino mass within a consistent cosmological framework,we investigate three massive neutrinos with normal hierarchy(NH)and inverted hierarchy(IH)in both the axion-like early dark energy(AxiEDE)and AdS-EDE *** use joint datasets including the cosmic microwave background power spectrum from Plaanck 2018,Pantheon of type la supernova,baryon acoustic oscillation,and H0data from *** the vAxi-EDE model,we obtain∑m_(v),NH<0.152 eV and∑m_(v),IH<0.178 eV,whereas for the vAdS-EDE model,we find∑m_(v),NH<0.135 eV and∑m_(v),IH<0.167 *** results exhibit a preference for NH in both the vAxi-EDE and vAdS-EDE models.

关键词： neutrino mass cosmological tension early dark energy

Parametric instability in the pure-quartic nonlinear Schr?dinger equation

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Chinese physics B 2024年第3期 363-368页

作者：张云红刘冲 School of physics Northwest University Shaanxi Key Laboratory for theoretical physics Frontiers Peng Huanwu center for Fundamental Theory

We study the nonlinear stage of modulation instability(MI) in the non-intergrable pure-quartic nonlinear Schr?dinger equation where the fourth-order dispersion is modulated periodically. Using the three-mode truncation, we reveal the complex recurrence of parametric resonance(PR) breathers, where each recurrence is associated with two oscillation periods(PR period and internal oscillation period). The nonlinear stage of parametric instability admits the maximum energy exchange between the spectrum sidebands and central mode occurring outside the MI gain band.

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