Modern Physics Letters A最新文献_第8页

Physical analysis of anisotropic compact stars in f(𝒬) gravity f(𝒬)重力下各向异性致密星的物理分析

4区物理与天体物理

Modern Physics Letters A Pub Date : 2023-11-10 DOI: 10.1142/s0217732323501523

Muhammad Adeel, M. Zeeshan Gul, Shamaila Rani, Abdul Jawad

{"title":"Physical analysis of anisotropic compact stars in f(𝒬) gravity","authors":"Muhammad Adeel, M. Zeeshan Gul, Shamaila Rani, Abdul Jawad","doi":"10.1142/s0217732323501523","DOIUrl":"https://doi.org/10.1142/s0217732323501523","url":null,"abstract":"The main objective of this study is to investigate the stability and viability of anisotropic compact stellar objects using the Krori–Burua solutions in [Formula: see text] gravity, where [Formula: see text] is a nonmetricity scalar that explains the gravitational effects. We use a static spherical metric in the inner region and Schwarzschild spacetime in the outer region of the Her X-I, SAX J 1808.4-3658 and 4U1820-30 compact stars to investigate their physical properties. By using observed values of the radius and mass of the considered compact stars, the unknown parameters are determined. We use a particular model of this theory to examine the behavior of energy density, pressure components, anisotropy, equation of state parameters and energy constraints in the interior of the proposed stellar objects. The Tolman–Oppenheimer–Volkoff equation is used to analyze the equilibrium state of these stars and causality condition, Herrera cracking method, adiabatic index methods are used to determine their stability. It is found that revolutionary technique sheds new light on the development of observationally accurate gravity model.","PeriodicalId":18752,"journal":{"name":"Modern Physics Letters A","volume":" 12","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-11-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135190961","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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

Lévy-Leblond equation and Eisenhart–Duval lift in Koopman–von Neumann mechanics 库普曼-冯-诺伊曼力学中的l<s:1> - leblond方程和Eisenhart-Duval升力

4区物理与天体物理

Modern Physics Letters A Pub Date : 2023-11-10 DOI: 10.1142/s0217732323501493

Bikram Keshari Parida, Abhijit Sen, Shailesh Dhasmana, Zurab K. Silagadze

{"title":"Lévy-Leblond equation and Eisenhart–Duval lift in Koopman–von Neumann mechanics","authors":"Bikram Keshari Parida, Abhijit Sen, Shailesh Dhasmana, Zurab K. Silagadze","doi":"10.1142/s0217732323501493","DOIUrl":"https://doi.org/10.1142/s0217732323501493","url":null,"abstract":"The Koopman–von Neumann (KvN) mechanics is an approach that was formulated long ago to answer the question regarding the existence of a Hilbert space representation of classical mechanics. KvN mechanics is a non-relativistic theory, and it is not clear how spin can be included in it, since spin is widely regarded as a relativistic property. Cabrera et al., in Eur. Phys. J. Spec. Top. 227, 2195 (2019) argued that the Spohn equation [Spohn, Ann. Phys. 282, 420 (2000)] is the correct classical framework for the Koopman–von Neumann theory corresponding to the Dirac equation. However, after Lévy-Leblond’s seminal work on this topic, it became clear that spin naturally arises also from the Galilean invariant wave equations, without any need of relativistic considerations. Inspired by this, we propose another possibility of including spin in the KvN formalism: the Lévy-Leblond equation in the Koopman–von Neumann formalism can be obtained as a null reduction of the massless Dirac equation in the Eisenhart–Duval lift metric. To illustrate the idea, we implement it for a one-dimensional classical system without magnetic interactions.","PeriodicalId":18752,"journal":{"name":"Modern Physics Letters A","volume":" 7","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-11-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135191919","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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

Quantifying quantum correlations beyond entanglement via robust photon hopping in an optomechanical system 通过光力学系统中鲁棒光子跳变来量化超越纠缠的量子相关

4区物理与天体物理

Modern Physics Letters A Pub Date : 2023-11-08 DOI: 10.1142/s0217732323501547

Y. Lahlou, B. Maroufi, M. Daoud

{"title":"Quantifying quantum correlations beyond entanglement via robust photon hopping in an optomechanical system","authors":"Y. Lahlou, B. Maroufi, M. Daoud","doi":"10.1142/s0217732323501547","DOIUrl":"https://doi.org/10.1142/s0217732323501547","url":null,"abstract":"Quantum correlations beyond quantum entanglement represent vital resources in quantum information processing as well as in quantum computation. In fact, both quantum entanglement and quantum correlation are the same when the quantum system is described by pure states. However, this is not exactly the case when general mixed states are considered. In order to clarify this, a simple model has been proposed for the production and quantification of these quantum correlations between two mechanical resonators that are macroscopic in two Fabry–Pérot cavities optomechanical coupled by the photon hopping process. In this model, we analyze and investigate the quantification of the quantum correlation beyond the entanglement between the mechanical modes. We determine the global covariance matrix of the model from which we derive the expression of the entropy of formation ([Formula: see text]) as well as the Gaussian quantum discord ([Formula: see text]), which quantify the amount of quantum entanglement and quantum correlations, respectively. The analysis based on these two quantum correlations quantifiers shows that quantum discord is more appropriate to characterize the quantum correlations between the mechanical modes in an optomechanical quantum system in the presence of robust photon hopping.","PeriodicalId":18752,"journal":{"name":"Modern Physics Letters A","volume":"4 15","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-11-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135391514","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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

Big Rip singularity in f(R,T) gravity with tilted observers 大撕裂奇点在f(R,T)重力倾斜观测者

4区物理与天体物理

Modern Physics Letters A Pub Date : 2023-11-08 DOI: 10.1142/s0217732323501468

V. J. Dagwal, D. D. Pawar, Y. S. Solanke

引用次数: 0

Bit leakage-resistant quantum private magnitude comparison 比特防泄漏量子私有量级比较

4区物理与天体物理

Modern Physics Letters A Pub Date : 2023-11-08 DOI: 10.1142/s0217732323501171

Yan-Feng Lang

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Comments on “Numerical study of the SWKB condition of novel classes of exactly solvable systems” 对“新一类精确可解系统的SWKB条件的数值研究”的评注

4区物理与天体物理

Modern Physics Letters A Pub Date : 2023-11-04 DOI: 10.1142/s0217732323750020

Jonathan Bougie, Asim Gangopadhyaya, Constantin Rasinariu

引用次数: 0

A comment on singular and nonsingular black holes using the Gaussian distribution 用高斯分布对奇异和非奇异黑洞的评论

4区物理与天体物理

Modern Physics Letters A Pub Date : 2023-11-04 DOI: 10.1142/s0217732323750032

D. Batic, M. Nowakowski, S. A. Salim

引用次数: 0

Distribution dynamics of fisher and Wigner–Yanase information correlations of two qubits coupled to an open superconducting cavity 两个量子比特耦合到开放超导腔的fisher和Wigner-Yanase信息相关的分布动力学

4区物理与天体物理

Modern Physics Letters A Pub Date : 2023-11-04 DOI: 10.1142/s0217732323501511

F. M. Aldosari, A.-B. A. Mohamed, A. Rahman, M. Hashem

{"title":"Distribution dynamics of fisher and Wigner–Yanase information correlations of two qubits coupled to an open superconducting cavity","authors":"F. M. Aldosari, A.-B. A. Mohamed, A. Rahman, M. Hashem","doi":"10.1142/s0217732323501511","DOIUrl":"https://doi.org/10.1142/s0217732323501511","url":null,"abstract":"In this paper, we explore distribution dynamics of two-qubit Fisher and skew information correlations of a dissipative microwave cavity field interacting with two charged superconducting qubits. Besides the negativity function, non-classical correlations beyond entanglement are studied using local quantum Fisher information (LQFI) and local quantum uncertainty (LQU). We find that the two-qubit non-classical correlations are sensitive to qubit–qubit distribution angle, two-qubit dissipation parameter, and initial coherent state intensity. The phenomena of frozen quantum correlations, sudden death or birth, as well as revival dynamical maps are feasible in the current two-qubit state when exposed to a microwave cavity. The non-classical correlations and entanglement have been found damped under the two-qubit dissipation appearance in the field. For the increasing strength of coherence intensity of the field, the two-qubit non-classical correlations functions remain to emerge quickly and oscillate with higher frequency, although with the least amplitudes. Interestingly, unlike the non-classical correlations, negativity does not emerge against higher coherence strengths of the cavity and remains completely zero. Finally, for the least dissipation and higher coherence strength, one can readily generate non-classical two-qubit states employing a microwave cavity.","PeriodicalId":18752,"journal":{"name":"Modern Physics Letters A","volume":"52 10","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-11-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135775861","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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

Investigations on the Ti-induced fusion cross-sections in the range 44≤Z≤104 44≤Z≤104范围内ti诱导熔合截面的研究

4区物理与天体物理

Modern Physics Letters A Pub Date : 2023-10-31 DOI: 10.1142/s021773232350147x

L. Reddi Rani, N. Sowmya, H. C. Manjunatha, M. M. Armstrong Arasu

引用次数: 0

Determination of Tsallis parameters for K∗(892)± mesons in inelastic pp, pPb and PbPb collisions 非弹性pp, pPb和PbPb碰撞中K *(892)±介子的Tsallis参数测定

4区物理与天体物理

Modern Physics Letters A Pub Date : 2023-10-31 DOI: 10.1142/s0217732323501481

Zain Ul Abidin, Uzma Tabassam, Muhammad Ali

{"title":"Determination of Tsallis parameters for K∗(892)± mesons in inelastic pp, pPb and PbPb collisions","authors":"Zain Ul Abidin, Uzma Tabassam, Muhammad Ali","doi":"10.1142/s0217732323501481","DOIUrl":"https://doi.org/10.1142/s0217732323501481","url":null,"abstract":"Doubly differential transverse momentum spectra of strange mesons [Formula: see text] and [Formula: see text] within rapidity interval of [Formula: see text] are studied by using Monte Carlo event generators in pp, pPb and PbPb collisions at different center-of-mass energies. The predictions of simulations are compared to the ALICE data. The fitting of doubly differential transverse momentum spectra of ALICE data is performed by using Tsallis distribution function. To check the quality of the fitting, chemical potential is also set to zero value. The extracted values of the non-extensive parameter ([Formula: see text]), a chemical potential [Formula: see text] and effective Tsallis temperature [Formula: see text] for different particle species have been obtained from the thermodynamically consistent Tsallis distribution function. It is observed that the effective Tsallis temperature increases at different center-of-mass energies. The predictions of the MC event generators, i.e. PYTHIA8 CR and HIJING 2.0 are compared to the ALICE data, deviations are observed which may be due to the reshuffling of parton colors and string fragmentation.","PeriodicalId":18752,"journal":{"name":"Modern Physics Letters A","volume":"42 ","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135814046","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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