Communications in Theoretical Physics最新文献_第4页

Discrete Boltzmann model with split collision for nonequilibrium reactive flows* 非平衡态反应流的分裂碰撞离散玻尔兹曼模型*

IF 3.1 3区物理与天体物理

Communications in Theoretical Physics Pub Date : 2024-07-04 DOI: 10.1088/1572-9494/ad4a36

Chuandong Lin, Kai H Luo and Huilin Lai

{"title":"Discrete Boltzmann model with split collision for nonequilibrium reactive flows*","authors":"Chuandong Lin, Kai H Luo and Huilin Lai","doi":"10.1088/1572-9494/ad4a36","DOIUrl":"https://doi.org/10.1088/1572-9494/ad4a36","url":null,"abstract":"A multi-relaxation-time discrete Boltzmann model (DBM) with split collision is proposed for both subsonic and supersonic compressible reacting flows, where chemical reactions take place among various components. The physical model is based on a unified set of discrete Boltzmann equations that describes the evolution of each chemical species with adjustable acceleration, specific heat ratio, and Prandtl number. On the right-hand side of discrete Boltzmann equations, the collision, force, and reaction terms denote the change rates of distribution functions due to self- and cross-collisions, external forces, and chemical reactions, respectively. The source terms can be calculated in three ways, among which the matrix inversion method possesses the highest physical accuracy and computational efficiency. Through Chapman–Enskog analysis, it is proved that the DBM is consistent with the reactive Navier–Stokes equations, Fick's law and the Stefan–Maxwell diffusion equation in the hydrodynamic limit. Compared with the one-step-relaxation model, the split collision model offers a detailed and precise description of hydrodynamic, thermodynamic, and chemical nonequilibrium effects. Finally, the model is validated by six benchmarks, including multicomponent diffusion, mixture in the force field, Kelvin–Helmholtz instability, flame at constant pressure, opposing chemical reaction, and steady detonation.","PeriodicalId":10641,"journal":{"name":"Communications in Theoretical Physics","volume":"42 1","pages":""},"PeriodicalIF":3.1,"publicationDate":"2024-07-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141549875","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

New patterns of localized excitations in (2+1)-dimensions: The fifth-order asymmetric Nizhnik–Novikov–Veselov equation (2+1)维局部激发的新模式：五阶不对称 Nizhnik-Novikov-Veselov 方程

IF 3.1 3区物理与天体物理

Communications in Theoretical Physics Pub Date : 2024-07-04 DOI: 10.1088/1572-9494/ad531b

Jianyong Wang and Yuanhua Chai

引用次数: 0

A regular MOG black hole’s impact on shadows and gravitational weak lensing in the presence of a quintessence field 常规 MOG 黑洞对阴影和存在五元场的引力弱透镜的影响

IF 3.1 3区物理与天体物理

Communications in Theoretical Physics Pub Date : 2024-07-03 DOI: 10.1088/1572-9494/ad4c55

Ahmad Al-Badawi, Sanjar Shaymatov, Mirzabek Alloqulov and Anzhong Wang

{"title":"A regular MOG black hole’s impact on shadows and gravitational weak lensing in the presence of a quintessence field","authors":"Ahmad Al-Badawi, Sanjar Shaymatov, Mirzabek Alloqulov and Anzhong Wang","doi":"10.1088/1572-9494/ad4c55","DOIUrl":"https://doi.org/10.1088/1572-9494/ad4c55","url":null,"abstract":"We investigate the impact of the modified gravity (MOG) field and the quintessence scalar field on horizon evolution, black hole (BH) shadow and the weak gravitational lensing around a static spherically symmetric BH. We first begin to write the BH metric associated with the MOG parameter and quintessence scalar field. We then determine the BH shadow and obtain numerical solutions for the photon sphere and shadow radius. We show that the MOG (α) and the quintessence (c) parameters have a significant impact on the BH shadow and photon sphere. Based on the analysis, we further show that the combined effects of the MOG parameter and quintessence field can increase the values of BH shadow and photon sphere radii. We also obtain constraints on the BH parameters by applying the observational data of Sgr A⋆ and M87⋆. Finally, we consider the weak deflection angle of BH within the context of the Gauss–Bonnet theorem (GBT) and show that the combined effects of the MOG and quintessence parameters do make the value of the deflection angle increase, and find this remarkable property is in good agreement with the physical meaning of both parameters that can maintain the strong gravitational field in the surrounding environment of a BH.","PeriodicalId":10641,"journal":{"name":"Communications in Theoretical Physics","volume":"45 1","pages":""},"PeriodicalIF":3.1,"publicationDate":"2024-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141549879","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Families of Schmidt-number witnesses for high dimensional quantum states 高维量子态的施密特数见证系列

IF 3.1 3区物理与天体物理

Communications in Theoretical Physics Pub Date : 2024-07-03 DOI: 10.1088/1572-9494/ad48fb

Xian Shi

引用次数: 0

Asymmetric dark matter and Sommerfeld enhancement 不对称暗物质和索默费尔德增强

IF 3.1 3区物理与天体物理

Communications in Theoretical Physics Pub Date : 2024-07-03 DOI: 10.1088/1572-9494/ad4bba

Sujuan Qiu, Hoernisa Iminniyaz and Wensheng Huo

引用次数: 0

Consequences of a two-time relativistic Bohmian model 两时相对论玻密模型的后果

IF 3.1 3区物理与天体物理

Communications in Theoretical Physics Pub Date : 2024-06-19 DOI: 10.1088/1572-9494/ad48fe

Giuseppe Raguní

引用次数: 0

Hawking–Page transition and the dual relations of anti-de Sitter black holes surrounded by dark energy in general dimensions 霍金-帕格转换和反德西特黑洞在一般维度上被暗能量包围的对偶关系

IF 3.1 3区物理与天体物理

Communications in Theoretical Physics Pub Date : 2024-06-19 DOI: 10.1088/1572-9494/ad48fa

Zhang Xin and Xu Wei

{"title":"Hawking–Page transition and the dual relations of anti-de Sitter black holes surrounded by dark energy in general dimensions","authors":"Zhang Xin and Xu Wei","doi":"10.1088/1572-9494/ad48fa","DOIUrl":"https://doi.org/10.1088/1572-9494/ad48fa","url":null,"abstract":"Recently, a dual relation T0(n + 1) = THP(n) between the minimum temperature (T0(n + 1)) black hole phase and the Hawking–Page transition (THP(n)) black hole phase in two successive dimensions was introduced by Wei et al (2020 Phys. Rev. D102 10411); this was reminiscent of the anti-de Sitter/conformal field theory (AdS/CFT) correspondence, as the Hawking–Page transition temperature could be treated as the temperature of the dual physical quantity on the boundary and the latter corresponds to that in the bulk. In this paper, we discuss the Hawking–Page transition and the dual relations in AdS black holes surrounded by dark energy in general dimensions. Our findings reveal the occurrence of the Hawking–Page transition between the thermal AdS radiation and thermodynamically stable large AdS black holes, in both the spacetime surrounded by phantom dark energy and the spacetime surrounded by quintessence dark energy. We discuss the effects of the phantom dark energy and quintessence dark energy on the Hawking–Page transition temperature. For the dual relation in particular, it works well for the case of an AdS black holes surrounded by phantom dark energy. For the case of an AdS black hole surrounded by quintessence dark energy, the dual relation should be modified under an open assumption that the state parameter and the density parameter of the quintessence dark energy depend on the dimensions of the spacetime.","PeriodicalId":10641,"journal":{"name":"Communications in Theoretical Physics","volume":"19 1","pages":""},"PeriodicalIF":3.1,"publicationDate":"2024-06-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141502843","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Nonlocal coherence harvesting from quantum vacuum 从量子真空中获取非局部相干性

IF 3.1 3区物理与天体物理

Communications in Theoretical Physics Pub Date : 2024-06-11 DOI: 10.1088/1572-9494/ad4a38

Rui-Di Wang, Shu-Min Wu and Xiao-Li Huang

引用次数: 0

Optimized generation of entanglement based on the f-STIRAP technique 基于 f-STIRAP 技术的纠缠优化生成

IF 3.1 3区物理与天体物理

Communications in Theoretical Physics Pub Date : 2024-06-11 DOI: 10.1088/1572-9494/ad3f94

Dongni Chen, Jiahui Li, Stefano Chesi and Ying-Dan Wang

引用次数: 0

Restoring cosmological concordance with axion-like early dark energy and dark matter characterized by a constant equation of state? 以恒定状态方程为特征的类轴心早期暗能量和暗物质能否恢复宇宙学一致性？

IF 3.1 3区物理与天体物理

Communications in Theoretical Physics Pub Date : 2024-06-11 DOI: 10.1088/1572-9494/ad426e

Yan-Hong Yao and Xin-He Meng

{"title":"Restoring cosmological concordance with axion-like early dark energy and dark matter characterized by a constant equation of state?","authors":"Yan-Hong Yao and Xin-He Meng","doi":"10.1088/1572-9494/ad426e","DOIUrl":"https://doi.org/10.1088/1572-9494/ad426e","url":null,"abstract":"The Hubble tension persists as a challenge in cosmology. Even early dark energy (EDE) models, initially considered the most promising for alleviating the Hubble tension, fall short of addressing the issue without exacerbating other tensions, such as the S8 tension. Considering that a negative dark matter (DM) equation of state (EoS) parameter is conducive to reduce the value of the σ8 parameter, we extend the axion-like EDE model in this paper by replacing the cold dark matter (CDM) with DM characterized by a constant EoS wdm (referred to as WDM hereafter). We then impose constraints on this axion-like EDE extension model, along with three other models: the axion-like EDE model, ΛWDM, and ΛCDM. These constraints are derived from a comprehensive analysis incorporating data from the Planck 2018 cosmic microwave background, baryon acoustic oscillations, and the Pantheon compilation, as well as a prior on H0 (i.e. H0 = 73.04 ± 1.04, based on the latest local measurement by Riess et al) and a Gaussianized prior on S8 (i.e. S8 = 0.766 ± 0.017, determined through the joint analysis of KID1000+BOSS+2dLenS). We find that although the new model maintains the ability to alleviate the Hubble tension to ∼1.4σ, it still exacerbates the S8 tension to a level similar to that of the axion-like EDE model.","PeriodicalId":10641,"journal":{"name":"Communications in Theoretical Physics","volume":"1 1","pages":""},"PeriodicalIF":3.1,"publicationDate":"2024-06-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141530661","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0