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p-Wave resonances in the exponential cosine screened Coulomb potential 指数余弦屏蔽库仑势中的 p 波共振
Pub Date : 2024-04-25 DOI: 10.1088/1572-9494/ad432d
Y. Wang, Li-Guang Jiao, Aihua Liu, Yew Kam Ho, Stephan Fritzsche
We perform benchmark calculations of the p-wave resonances in the exponentially cosine screened Coulomb potential using the uniform complex-scaling generalized pseudospectral method. The present results show significant improvement in the calculation accuracy compared to previous predictions and correct the misidentification of resonance electron configuration in previous works. It is found that the resonance states approximately follow a n^2-scaling law which is similar to the bound counterparts. The birth of new resonance would distort the trajectory of an adjacent higher-lying resonance.
我们使用均匀复缩放广义伪谱法对指数余弦屏蔽库仑势中的 p 波共振进行了基准计算。与之前的预测相比,本结果表明计算精度有了显著提高,并纠正了之前工作中对共振电子构型的错误识别。研究发现,共振态近似遵循 n^2 缩放规律,这与束缚态类似。新共振的产生会扭曲相邻高位共振的轨迹。
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引用次数: 0
Observations on spontaneous chiral symmetry breaking and mass gap of QCD in finite volume 有限体积 QCD 的自发手性对称破缺和质量缺口观测
Pub Date : 2024-04-24 DOI: 10.1088/1572-9494/ad426f
Xiaolan Meng, Bolun Hu, Yi-Bo Yang
We present the lattice QCD simulation with the 2+1+1 flavor full QCD ensembles using near-physical quark masses and different spatial sizes $L$, at $asim$ 0.055 ;fm. The results show that the scalar and pesudoscalar 2-point correlator with the valence pion mass of approximately 230 MeV become degenerated at $Lle 1.0$ ;fm, and such an observation suggests that the spontaneous chiral symmetry breaking disappears effectively there. At the same time, the mass gap between the nucleon and pion masses remains larger then $Lambda_{rm QCD}$ at the entire $Lin[0.2,0.7]$ fm range.
我们利用接近物理的夸克质量和不同的空间尺寸$L$,在$asim$ 0.055 ;fm的条件下对2+1+1味全QCD集合进行了晶格QCD模拟。结果表明,在$Lle 1.0$ ;fm时,价先驱质量约为230 MeV的标量和pesudoscalar 2点关联子变得退化了,这种观察结果表明自发的手性对称破缺在那里有效地消失了。同时,在整个 $Lin[0.2,0.7]$ fm 范围内,核子和先驱质量之间的质量差距仍然大于 $Lambda_rm QCD}$。
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引用次数: 0
Quantifying quantum entanglement via machine learning models 通过机器学习模型量化量子纠缠
Pub Date : 2024-04-19 DOI: 10.1088/1572-9494/ad4090
Changchun Feng, Lin Chen
Quantifying entanglement measures for quantum states with unknown density matrices is a chal lenging task. Machine learning offers a new perspective to address this problem. By training machine learning models using experimentally measurable data, we can predict the target entan glement measures. In this study, we compare various machine learning models and find that the linear regression and stack models perform better than others. We investigate the model’s impact on quantum states across different dimensions and find that higher-dimensional quantum states yield better results. Additionally, we investigate which measurable data has better predictive power for target entanglement measures. Using correlation analysis and principal component analysis, we demonstrate that quantum moments exhibit a stronger correlation with coherent information among these data features.
量化具有未知密度矩阵的量子态的纠缠度量是一项艰巨的任务。机器学习为解决这一问题提供了新的视角。通过使用实验可测量数据训练机器学习模型,我们可以预测目标纠缠度量。在本研究中,我们对各种机器学习模型进行了比较,发现线性回归和堆栈模型的性能优于其他模型。我们研究了模型对不同维度量子态的影响,发现高维度量子态的结果更好。此外,我们还研究了哪些可测量数据对目标纠缠度量具有更好的预测能力。通过相关分析和主成分分析,我们证明量子矩与这些数据特征中的相干信息具有更强的相关性。
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引用次数: 0
Detailed Analysis of Relativistic Confi guration of Bardeen Anisotropic Spheres inModi fied f(G) Gravity 各向异性巴丁球在模拟 f(G) 重力下的相对论配置的详细分析
Pub Date : 2024-04-17 DOI: 10.1088/1572-9494/ad3f98
A. Malik, Ayesha Almas, T. Naz, Rubab Manzoor, M. Z. Bhatti
The objective of present work is to deal with physical features of anisotropic compact objects within the framework of f(G) modified theory of gravity. For our present work, the Einstein- Maxwell equations defined under the impression of charge by utilizing the Krori-Barua metric i.e, λ(r) = Xr2 + Y and β(r) = Zr2, described by spherically symmetric space-time. To accomplish the desired objective, we calculate the undefined constrains utilized within the stellar debate by using the comparison method of interior and exterior spacetime while Bardeen geometry consider as an exterior. Further, to analyze the stellar configuration of Bardeen compact stars by assuming viable f(G) models including logarithmic corrected, we establish some expressions for examining the components of pressure and density, respectively. We address the energy conditions to verify our model’s viability for the various star candidates. Some other physical features, such as equilibrium condition, equation of state parameters, adiabatic index, stability analysis, mass function, surface Redshift and compactness factor, have been investigated. Conclusively, all the obtained results shows that the system under consideration is physically stable, free from singularity, and viable. Keywords: Bardeen compact stars, f(G) modified gravity, Krori-Barua potential.
本研究的目的是在 f(G) 修正万有引力理论框架内研究各向异性紧凑物体的物理特征。在我们目前的工作中,爱因斯坦-麦克斯韦方程在电荷印象下定义,利用 Krori-Barua 度量,即 λ(r) = Xr2 + Y 和 β(r) = Zr2,由球面对称时空描述。为了达到预期目标,我们使用内部时空和外部时空的比较方法计算恒星辩论中使用的未定义约束条件,同时将巴丁几何视为外部时空。此外,为了通过假设可行的 f(G) 模型(包括对数修正)来分析巴丁紧凑恒星的恒星构型,我们分别建立了一些用于检验压力和密度成分的表达式。我们讨论了能量条件,以验证我们的模型在各种候选恒星中的可行性。我们还研究了其他一些物理特征,如平衡条件、状态方程参数、绝热指数、稳定性分析、质量函数、表面红移和紧凑系数。最后,所有结果都表明,所考虑的系统在物理上是稳定的,没有奇点,是可行的。关键词巴丁紧凑星、f(G) 修正引力、克罗里-巴鲁阿势。
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引用次数: 0
Stable stripe and vortex solitons in two-dimensional spin-orbit coupled Bose-Einstein condensates 二维自旋轨道耦合玻色-爱因斯坦凝聚体中的稳定条纹和涡旋孤子
Pub Date : 2024-04-15 DOI: 10.1088/1572-9494/ad3e66
Yuan Guo, Muhammad Idrees, Ji Lin, Hui-jun Li
We present a flexible manipulation and control of solitons via Bose-Einstein condensate. In the presence of Rashba spin-orbit coupling and repulsive interactions within a harmonic potential, our investigation reveals the numerical local solutions within the system. By manipulating the strength of repulsive interactions and adjusting spin-orbit coupling while maintaining a zero-frequency rotation, diverse soliton structures emerge within the system. These include plane-wave solitons, two distinct types of stripe solitons, and odd petal solitons with both single and double layers. The stability of these solitons is intricately dependent on the varying strength of spin-orbit coupling. Specifically, stripe solitons can maintain stable existence within regions characterized by enhanced spin-orbit coupling while petal solitons are unable to sustain stable existence under similar conditions. When rotational frequency is introduced to the system, solitons undergo a transition from stripe solitons to a vortex array characterized by sustained rotation. The rotational directions of clockwise and counterclockwise are non-equivalent owing to spin-orbit coupling. As a result, the properties of vortex solitons exhibit significant variation and are capable of maintaining a stable existence in the presence of repulsive interactions.
我们提出了一种通过玻色-爱因斯坦凝聚态灵活操纵和控制孤子的方法。在谐波势中存在拉什巴自旋轨道耦合和斥力相互作用的情况下,我们的研究揭示了系统内的局部数值解。在保持零频率旋转的同时,通过操纵斥力相互作用的强度和调整自旋轨道耦合,系统内出现了多种孤子结构。其中包括平面波孤子、两种不同类型的条纹孤子,以及具有单层和双层的奇数花瓣孤子。这些孤子的稳定性与自旋轨道耦合的不同强度密切相关。具体来说,条纹孤子能在自旋轨道耦合增强的区域内保持稳定存在,而花瓣孤子则无法在类似条件下保持稳定存在。当系统中引入旋转频率时,孤子会从条纹孤子过渡到以持续旋转为特征的涡旋阵列。由于自旋轨道耦合,顺时针和逆时针的旋转方向是不等同的。因此,涡旋孤子的特性表现出显著的变化,并能在存在排斥相互作用的情况下保持稳定存在。
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引用次数: 0
A combined Liouville integrable hierarchy associated with a fourth-order matrix spectral problem 与四阶矩阵谱问题相关的组合刘维尔可积分层次结构
Pub Date : 2024-04-12 DOI: 10.1088/1572-9494/ad3dd9
Wen-Xiu Ma
This paper aims to discuss a fourth-order matrix spectral problem involving four potentials and to generate an associated Liouville integrable hierarchy via the zero curvature formulation. A bi-Hamiltonian formulation is furnished by applying the trace identity and a recursion operator is explicitly worked out, which exhibits the Liouville integrability of each model in the resulting hierarchy. Two specific examples, consisting of novel generalized combined nonlinear Schroedinger equations and modified Korteweg-de Vries equations, are given.
本文旨在讨论一个涉及四个势的四阶矩阵谱问题,并通过零曲率公式生成一个相关的刘维尔可积分层次结构。通过应用迹同一性,本文提出了一个双哈密顿公式,并明确计算出一个递归算子,该算子显示了所产生的层次结构中每个模型的Liouville可积分性。文中给出了两个具体例子,包括新颖的广义组合非线性薛定谔方程和修正的 Korteweg-de Vries 方程。
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引用次数: 0
Microscopic ensemble bootstrap in phase space 相空间中的微观集合引导
Pub Date : 2024-04-10 DOI: 10.1088/1572-9494/ad3cc3
Yu Zhang
The bootstrap method which has been studied under many quantum mechanical models turns out feasible in microcanonical ensemble as well. While the approach in [Y. Nakayama, Modern Physics Letters A 37, 10.1142/s0217732322500547 (2022)] produces a sector when energy is negative, in this paper we report a method that has stronger constraints and results in a smaller region. We also study other models to demonstrate the effectiveness of our method.
在许多量子力学模型下研究过的自举法在微观经典合集中也是可行的。虽然[Y. Nakayama, Modern Physics Letters A 37, 10.1142/s0217732322500547 (2022)]中的方法会在能量为负时产生一个扇区,但在本文中,我们报告了一种具有更强约束且结果区域更小的方法。我们还研究了其他模型,以证明我们方法的有效性。
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引用次数: 0
Braneworld black holes with ModMax electrodynamics on the brane 在rane上使用ModMax电动力学的星际黑洞
Pub Date : 2024-04-10 DOI: 10.1088/1572-9494/ad3cc4
Haryanto Siahaan
In this study, we investigate ModMax electrodynamics localized within the RS-II and DGP branes, deriving corresponding 3-brane spacetime solutions that conform to the effective Einstein equations in each specific scenario. We construct solutions for charged black holes within the effective Einstein equation framework in both the braneworld scenarios. The examination explores the trajectories of charged objects in this spacetime, underscoring the significance of the nonlinear parameter. Our analysis uncovers that, similar to the prior ModMax black hole investigation, the nonlinear parameter plays a pivotal role in suppressing the effective charge of the black hole, owing to its definite positive value.
在本研究中,我们研究了在RS-II和DGP支链内局部化的ModMax电动力学,推导出相应的三rane时空解,这些解符合每个特定情景下的有效爱因斯坦方程。我们在有效爱因斯坦方程框架内构建了带电黑洞在两种支流世界方案中的解决方案。研究探讨了带电物体在该时空中的轨迹,强调了非线性参数的重要性。我们的分析发现,与之前的 ModMax 黑洞研究类似,由于非线性参数的确定正值,它在抑制黑洞有效电荷方面起着关键作用。
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引用次数: 0
The Impact of Segment Dilution on the Magnetic and Hysteretic Properties of Ferrimagnetic (1/2 -1) Segmented Ising Nanowire 分段稀释对铁磁性 (1/2 -1) 分段伊辛纳米线的磁性和滞后特性的影响
Pub Date : 2024-04-07 DOI: 10.1088/1572-9494/ad3b8c
Ersin Kantar
This study explores the presence of diverse phase diagrams and hysteresis characteristics, as well as their dependencies on segment dilution, in an Ising-type core/shell segmented nanostructure. The magnetic and hysteretic behaviors of the nanostructure were carefully investigated by employing the effective-field theory, and its respective diluted parameters. The phase diagrams reveal characteristic phenomena that are influenced by the dilution parameters. Specifically, this study examined the variations in phase transitions and tricritical points by altering the dilution and physical parameters of the segments. The investigation also encompasses an examination of the hysteresis characteristics, including the hysteresis loop, coercivity and remanence, in relation to the segment dilution dependence of the segmented nanowire. It was discovered that as the temperature rises, the hysteresis loop areas diminish. However, intriguingly, at specific dilution and crystal area values, the hysteresis loop areas exhibit an augmentation.
本研究探讨了 Ising 型核/壳分段纳米结构中存在的各种相图和磁滞特性,以及它们与分段稀释的关系。通过采用有效场理论及其相应的稀释参数,仔细研究了该纳米结构的磁性和磁滞行为。相图显示了受稀释参数影响的特征现象。具体来说,本研究通过改变稀释和物理参数,考察了相变和三临界点的变化。这项研究还考察了与分段纳米线的分段稀释相关的磁滞特性,包括磁滞环、矫顽力和剩磁。研究发现,随着温度的升高,磁滞环的面积会减小。然而,有趣的是,在特定的稀释度和晶体面积值下,磁滞环面积会增大。
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引用次数: 0
Decomposition solutions and Backlund transformations of the BKP and CKP equations BKP 和 CKP 方程的分解解和 Backlund 变换
Pub Date : 2024-04-07 DOI: 10.1088/1572-9494/ad3b8b
Xiazhi Hao, Sen-uye Lou
This manuscript introduces a modified formal variable separation approach, showcasing a systematic and notably straightforward methodology for analyzing the B-type Kadomtsev-Petviashvili equation. Through the application of this approach, we successfully ascertain decomposition solutions, Backlund transformations, the Lax pair, and the linear superposition solution associated with the aforementioned equation. Furthermore, we expand the utilization of this technique to the C-type Kadomtsev-Petviashvili equation, leading to the derivation of decomposition solutions, Backlund transformations, and the Lax pair specific to this equation. The results obtained not only underscore the efficacy of the proposed approach but also highlight its potential in offering a profound comprehension of integrable behaviors in nonlinear systems. Moreover, the approach establishes an efficient framework for establishing interrelations between diverse systems.
本手稿介绍了一种改进的形式变量分离法,展示了一种系统而显著直接的方法来分析 B 型卡多姆采夫-彼得维亚什维利方程。通过应用这种方法,我们成功地确定了与上述方程相关的分解解、Backlund 变换、Lax 对和线性叠加解。此外,我们还将这一技术的应用扩展到 C 型卡多姆采夫-彼得维亚什维利方程,从而推导出该方程特有的分解解、Backlund 变换和 Lax 对。所获得的结果不仅强调了所提方法的有效性,而且突出了其在深刻理解非线性系统中可积分行为方面的潜力。此外,该方法还为建立不同系统之间的相互关系建立了一个有效的框架。
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引用次数: 0
期刊
Communications in Theoretical Physics
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