Physics Open最新文献_第10页

Gravitational lensing and missing mass 引力透镜效应和质量缺失

Physics Open Pub Date : 2023-05-01 DOI: 10.1016/j.physo.2023.100150

Saurya Das , Sourav Sur

引用次数: 0

General pseudo self-adjoint boundary conditions for a 1D KFG particle in a box 框内一维KFG粒子的一般伪自伴随边界条件

Physics Open Pub Date : 2023-05-01 DOI: 10.1016/j.physo.2023.100151

Salvatore De Vincenzo

{"title":"General pseudo self-adjoint boundary conditions for a 1D KFG particle in a box","authors":"Salvatore De Vincenzo","doi":"10.1016/j.physo.2023.100151","DOIUrl":"10.1016/j.physo.2023.100151","url":null,"abstract":"<div>We consider a 1D Klein–Fock–Gordon particle in a finite interval, or box. We construct for the first time the most general set of pseudo self-adjoint boundary conditions for the Hamiltonian operator that is present in the first order in time 1D Klein–Fock–Gordon wave equation, or the 1D Feshbach–Villars wave equation. We show that this set depends on four real parameters and can be written in terms of the one-component wavefunction for the second order in time 1D Klein–Fock–Gordon wave equation and its spatial derivative, both evaluated at the endpoints of the box. Certainly, we write the general set of pseudo self-adjoint boundary conditions also in terms of the two-component wavefunction for the 1D Feshbach–Villars wave equation and its spatial derivative, evaluated at the ends of the box; however, the set actually depends on these two column vectors each multiplied by the singular matrix that is present in the kinetic energy term of the Hamiltonian. As a consequence, we found that the two-component wavefunction for the 1D Feshbach–Villars equation and its spatial derivative do not necessarily satisfy the same boundary condition that these quantities satisfy when multiplied by the singular matrix. In any case, given a particular boundary condition for the one-component wavefunction of the standard 1D Klein–Fock–Gordon equation and using the pair of relations that arise from the very definition of the two-component wavefunction for the 1D Feshbach–Villars equation, the respective boundary condition for the latter wavefunction and its derivative can be obtained. Our results can be extended to the problem of a 1D Klein–Fock–Gordon particle moving on a real line with a point interaction (or a hole) at one point.</div>","PeriodicalId":36067,"journal":{"name":"Physics Open","volume":"15 ","pages":"Article 100151"},"PeriodicalIF":0.0,"publicationDate":"2023-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47138149","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Using optical systems to simulate topological systems in momentum space and measure their topological numbers 利用光学系统模拟动量空间中的拓扑系统并测量其拓扑数

Physics Open Pub Date : 2023-05-01 DOI: 10.1016/j.physo.2023.100145

Zhongcheng Feng, Jiansheng Wu

引用次数: 0

Relativistic energies and information entropy of the inversely quadratic Hellmann potential 逆二次赫尔曼势的相对论能量和信息熵

Physics Open Pub Date : 2023-05-01 DOI: 10.1016/j.physo.2023.100152

I.J. Njoku, C.P. Onyenegecha, C.J. Okereke, P. Nwaokafor, C.C. Abara

引用次数: 0

Electromagnetic angular momentum in anisotropic media and Beth's torque 各向异性介质中的电磁角动量与贝思力矩

Physics Open Pub Date : 2023-05-01 DOI: 10.1016/j.physo.2023.100147

J.A.E. Roa-Neri , J.L. Jiménez , I. Campos

{"title":"Electromagnetic angular momentum in anisotropic media and Beth's torque","authors":"J.A.E. Roa-Neri , J.L. Jiménez , I. Campos","doi":"10.1016/j.physo.2023.100147","DOIUrl":"https://doi.org/10.1016/j.physo.2023.100147","url":null,"abstract":"<div>The interaction of radiation with material media is a very active area of research, in particular the interaction with new exotic materials. However, we find several controversies in this field, like the Abraham-Minkowski controversy, or the attribution of angular momentum to quasi-static fields.In the present work we show that besides the electromagnetic momentum density proportional to Poynting's vector, whose time derivative is force and therefore can produce a torque, there are other momentum densities implied by the macroscopic Maxwell equations transformed into momentum balance equations. These momentum densities are also related to forces and torques. We show in this way that torques like D × E and B × H appear in these balance equations transformed into balance equations of angular momentum. The density D × E was used by Beth [Phys. Rev. 50 115–125 (1936)] to measure the angular momentum of radiation fields in interaction with anisotropic dielectrics. Our analysis show that also static or quasi-static fields carry angular momentum and produce torques when interacting with anisotropic materials.</div>","PeriodicalId":36067,"journal":{"name":"Physics Open","volume":"15 ","pages":"Article 100147"},"PeriodicalIF":0.0,"publicationDate":"2023-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49766498","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Dynamics of quantum coherence in the Jaynes–Cummings model with quenched disorder 具有猝灭无序的Jaynes-Cummings模型中的量子相干动力学

Physics Open Pub Date : 2023-05-01 DOI: 10.1016/j.physo.2023.100146

Jesus H. Warnes , Fagner M. de Paula , Natanael C. Costa , Olimpio P. de Sá Neto

引用次数: 0

Unveiling the Markovian to non-Markovian transition with quantum collision models 用量子碰撞模型揭示马尔可夫到非马尔可夫跃迁

Physics Open Pub Date : 2023-05-01 DOI: 10.1016/j.physo.2023.100144

Willames F. Magalhães, Carlos O.A. Ribeiro Neto, Bertúlio de Lima Bernardo

引用次数: 1

Robustness of quantum coherence and quantum criticality in spin-1 many-body system 自旋1多体系统中量子相干性和量子临界性的鲁棒性

Physics Open Pub Date : 2023-05-01 DOI: 10.1016/j.physo.2023.100149

Wajid Joyia , Khalid Khan , Asif Ilyas , M.A. Khan

{"title":"Robustness of quantum coherence and quantum criticality in spin-1 many-body system","authors":"Wajid Joyia , Khalid Khan , Asif Ilyas , M.A. Khan","doi":"10.1016/j.physo.2023.100149","DOIUrl":"10.1016/j.physo.2023.100149","url":null,"abstract":"<div>The tripartite quantum coherence for spin-<math><mfrac><mrow><mn>1</mn></mrow><mrow><mn>2</mn></mrow></mfrac></math> and bipartite quantum coherence for spin-1 many-body systems are studied with the quantum renormalization group method to investigate the quantum criticality behaviour of both systems. We find both spin-<math><mfrac><mrow><mn>1</mn></mrow><mrow><mn>2</mn></mrow></mfrac></math> and spin-1 systems exhibit quantum criticality behaviour after different number of iterations. However, the bipartite quantum coherence for spin-1 system reaches the quantum criticality behaviour in lesser number of iterations than the tripartite quantum coherence for spin-<math><mfrac><mrow><mn>1</mn></mrow><mrow><mn>2</mn></mrow></mfrac></math> system. The quantum criticality behaviour of both systems is also investigated through non-analytic and the scaling behaviour of quantum coherence. Additionally, quantum correlations and quantum phase transition are observed to be more vigorous with higher spin comparatively to the number of parties (i.e., bipartite, tripartite, multipartite) involved in a quantum correlations.</div>","PeriodicalId":36067,"journal":{"name":"Physics Open","volume":"15 ","pages":"Article 100149"},"PeriodicalIF":0.0,"publicationDate":"2023-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48206096","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

A study on the prospects of vacuum gamma irradiation to enhance crosslinking for 3D-Printing PLA/MCC biocomposite filaments 真空辐照增强3d打印PLA/MCC生物复合长丝交联的前景研究

Physics Open Pub Date : 2023-05-01 DOI: 10.1016/j.physo.2023.100154

Rashed Almasri, Yoko Akiyama, Yuichiro Manabe, Fuminobu Sato

引用次数: 1

Category theory and organic electronics 范畴论与有机电子学

Physics Open Pub Date : 2023-05-01 DOI: 10.1016/j.physo.2023.100148

Jun-ichi Takahashi

{"title":"Category theory and organic electronics","authors":"Jun-ichi Takahashi","doi":"10.1016/j.physo.2023.100148","DOIUrl":"https://doi.org/10.1016/j.physo.2023.100148","url":null,"abstract":"<div>Inorganic semiconductors and conducting polymers are described by band conduction models with delocalized electrons, whereas small-molecule organic compounds are described by hopping conduction between localized molecular orbitals. However, the latter devices can reproduce fully the characteristics of semiconductor devices. Why are they so different and yet so similar? We will try to answer this question using Category theory and considering the meaning of electrical transport in electronic materials. The meaning of the category theory in physics is to consider different mathematical entities under a common mathematical structure.In this paper, the basic idea of category theory is first explained in detail using the example of complex impedance, and then four examples of its application are discussed. The derivation of the Mott-Gurney equation and the negative capacitance in OLED are discussed as examples of solving problems by moving to different categories. After those simple examples of formal rewriting from physical entity to mathematical entity, it is shown that electrical connection and electrical contact lead to direct sums and direct products of conducting states, based on the duality concept. We conclude that small-molecule organic compounds are not a mere branch of semiconductors, but rather equal counterparts of semiconductors in duality that are necessary to clarify the origin of the difference and similarity between organic electronics and semiconductor physics. Finally, by considering the electrical responses of OLEDs and OFETs in the immittance category, we show that they can be described under a common operating dynamic and propose a new operating model for OFETs.</div>","PeriodicalId":36067,"journal":{"name":"Physics Open","volume":"15 ","pages":"Article 100148"},"PeriodicalIF":0.0,"publicationDate":"2023-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49755426","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0