arXiv - PHYS - General Physics最新文献_第10页

The Schwarzschild-de Sitter Metric of Nonlocal $sqrt{dS}$ Gravity 非局部 $sqrt{dS}$ 引力的 Schwarzschild-de Sitter 度量

arXiv - PHYS - General Physics Pub Date : 2024-04-08 DOI: arxiv-2404.05848

Ivan Dimitrijevic, Branko Dragovich, Zoran Rakic, Jelena Stankovic

{"title":"The Schwarzschild-de Sitter Metric of Nonlocal $sqrt{dS}$ Gravity","authors":"Ivan Dimitrijevic, Branko Dragovich, Zoran Rakic, Jelena Stankovic","doi":"arxiv-2404.05848","DOIUrl":"https://doi.org/arxiv-2404.05848","url":null,"abstract":"It is already known that a simple nonlocal de Sitter gravity model, which we\u0000denote as $sqrt{dS}$ gravity, contains an exact vacuum cosmological solution\u0000which mimics dark energy and dark matter and is in very good agreement with the\u0000standard model of cosmology. This success of $sqrt{dS}$ gravity motivated us\u0000to investigate how it works at lower than cosmic scale -- galactic and the\u0000solar system. This paper contains our investigation of the corresponding\u0000Schwarzschild-de Sitter metric of the $sqrt{dS}$ gravity model. To get exact\u0000solution, it is necessary to solve the corresponding nonlinear differential\u0000equation, what is a very complicated and difficult problem. What we obtained is\u0000a solution of linearized equation, which is related to space metric far from\u0000the massive body, where gravitational field is weak. The obtained approximate\u0000solution is of particular interest for examining the possible role of non-local\u0000de Sitter gravity $sqrt{dS}$ in describing the effects in galactic dynamics\u0000that are usually attributed to dark matter. The solution has been tested on the\u0000Milky Way and the spiral galaxy M33 and is in good agreement with observational\u0000measurements.","PeriodicalId":501190,"journal":{"name":"arXiv - PHYS - General Physics","volume":"22 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-04-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140566294","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

(Pseudo-)Synthetic BRST quantisation of the bosonic string and the higher quantum origin of dualities (玻色弦的（伪）合成 BRST 量子化与对偶性的高量子起源

arXiv - PHYS - General Physics Pub Date : 2024-04-08 DOI: arxiv-2404.06522

Andrei T. Patrascu

{"title":"(Pseudo-)Synthetic BRST quantisation of the bosonic string and the higher quantum origin of dualities","authors":"Andrei T. Patrascu","doi":"arxiv-2404.06522","DOIUrl":"https://doi.org/arxiv-2404.06522","url":null,"abstract":"In this article I am arguing in favour of the hypothesis that the origin of\u0000gauge and string dualities in general can be found in a higher-categorical\u0000interpretation of basic quantum mechanics. It is interesting to observe that\u0000the Galilei group has a non-trivial cohomology, while the Lorentz/Poincare\u0000group has trivial cohomology. When we constructed quantum mechanics, we noticed\u0000the non-trivial cohomology structure of the Galilei group and hence, we\u0000required for a proper quantisation procedure that would be compatible with the\u0000symmetry group of our theory, to go to a central extension of the Galilei group\u0000universal covering by co-cycle. This would be the Bargmann group. However,\u0000Nature didn't choose this path. Instead in nature, the Galilei group is not\u0000realised, while the Lorentz group is. The fact that the Galilei group has\u0000topological obstructions leads to a central charge, the mass, and a\u0000superselection rule, required to implement the Galilei symmetry, that forbids\u0000transitions between states of different mass. The topological structure of the\u0000Lorentz group however lacks such an obstruction, and hence allows for\u0000transitions between states of different mass. The connectivity structure of the\u0000Lorentz group as opposed to that of the Galilei group can be interpreted in the\u0000sense of an ER=EPR duality for the topological space associated to group\u0000cohomology. In string theory we started with the Witt algebra, and due to\u0000similar quantisation issues, we employed the central extension by co-cycle to\u0000obtain the Virasoro algebra. This is a unique extension for orientation\u0000preserving diffeomorphisms on a circle, but there is no reason to believe that,\u0000at the high energy domain in physics where this would apply, we do not have a\u0000totally different structure altogether and the degrees of freedom present there\u0000would require something vastly more general and global.","PeriodicalId":501190,"journal":{"name":"arXiv - PHYS - General Physics","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-04-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140566637","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

Physical mechanism for the geometric phases in optics and angular momentum holonomy 光学和角动量整体性中几何相的物理机制

arXiv - PHYS - General Physics Pub Date : 2024-04-03 DOI: arxiv-2404.05747

S C Tiwari

引用次数: 0

Non-invasive deep-brain stimulations by spatio-temporal fourier synthesis 通过时空傅立叶合成技术实现无创深层脑刺激

arXiv - PHYS - General Physics Pub Date : 2024-04-02 DOI: arxiv-2404.02186

Laszlo B. Kish, Andrea Antal

引用次数: 0

The 1932 Majorana equation: a forgotten but surprisingly modern particle theory 1932 年的马约拉纳方程：一个被遗忘却令人惊讶的现代粒子理论

arXiv - PHYS - General Physics Pub Date : 2024-04-01 DOI: arxiv-2404.01357

Luca Nanni

{"title":"The 1932 Majorana equation: a forgotten but surprisingly modern particle theory","authors":"Luca Nanni","doi":"arxiv-2404.01357","DOIUrl":"https://doi.org/arxiv-2404.01357","url":null,"abstract":"The Standard Model is an up-to-date theory that best summarizes current\u0000knowledge in particle physics. Although some problems still remain open, it\u0000represents the leading model which all physicists refer to. One of the pillars\u0000which underpin the Standard Model is represented by the Lorentz invariance of\u0000the equations that form its backbone. These equations made it possible to\u0000predict the existence of particles and phenomena that experimental physics had\u0000not yet been able to detect. The first hint of formulating a fundamental theory\u0000of particles can be found in the 1932 Majorana equation, formulated when\u0000electrons and protons were the only known particles. Today we know that parts\u0000of the hypotheses set by Majorana were not correct, but his equation hid\u0000concepts that are found in the Standard Model. In this study, the Majorana\u0000equation is revisited and solved for free particles. The time-like, light-like\u0000and space-like solutions, represented by infinite-component wave functions, are\u0000discussed. Furthermore, by introducing subsidiary conditions on the mass term,\u0000it is possible to quantize both the fermionic and the bosonic towers, obtaining\u0000the mass spectrum of the entire family of charged leptons, baryons and mesons.","PeriodicalId":501190,"journal":{"name":"arXiv - PHYS - General Physics","volume":"10 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140566179","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 Clifford algebra model in phase space 相空间中的克利福德代数模型

arXiv - PHYS - General Physics Pub Date : 2024-04-01 DOI: arxiv-2404.04278

Robert A. Wilson

引用次数: 0

Quantum matter and gravitation: photons in a waveguide 量子物质与引力：波导中的光子

arXiv - PHYS - General Physics Pub Date : 2024-03-31 DOI: arxiv-2404.04277

Victor Atanasov, Avadh Saxena

引用次数: 0

Experimental demonstration of a thermal-EM concentrator for enhancing EM signals and converging heat fluxes simultaneously 同时增强电磁信号和汇聚热通量的热电磁聚能器实验演示

arXiv - PHYS - General Physics Pub Date : 2024-03-25 DOI: arxiv-2403.16579

Hanchuan Chen, Yichao Liu, Fei Sun, Qianhan Sun, Xiaoxiao Wu, Ran Sun

{"title":"Experimental demonstration of a thermal-EM concentrator for enhancing EM signals and converging heat fluxes simultaneously","authors":"Hanchuan Chen, Yichao Liu, Fei Sun, Qianhan Sun, Xiaoxiao Wu, Ran Sun","doi":"arxiv-2403.16579","DOIUrl":"https://doi.org/arxiv-2403.16579","url":null,"abstract":"Simultaneously concentrating EM waves and heat fluxes to the same target\u0000region within an on-chip system carries substantial academic research\u0000importance and practical application value. Nevertheless, existing researches\u0000are primarily aimed at the design and experimentation of concentrators for\u0000individual EM waves or temperature fields. In this work, a thermal-EM\u0000concentrator, capable of simultaneously concentrating EM waves and heat fluxes,\u0000is designed using transformation optics/thermodynamics and fabricated with\u0000engineered EM-thermal metamaterials. The concentrating effects of the proposed\u0000thermal-EM concentrator on the thermal fluxes and EM waves are verified through\u0000numerical simulations and experimental measurements, respectively, which are in\u0000good agreement with each other. Both numerically simulated and experimentally\u0000measured results demonstrate the concentrating capability of the proposed\u0000thermal-EM concentrator, which can concentrate broadband TM-polarized EM waves\u0000ranging from 8-12 GHz and heat/cold flows to the same target region within an\u0000on-chip operating environment. The thermal-EM concentrator exhibits a thermal\u0000focusing efficiency close to 100% and more than three times enhancement of the\u0000magnetic field at the designed center frequency of 10 GHz. The proposed\u0000thermal-EM concentrator can be utilized for efficient cooling for the specified\u0000component and simultaneously enhancing the EM antenna's radiation/reception\u0000efficiency within an on-chip system.","PeriodicalId":501190,"journal":{"name":"arXiv - PHYS - General Physics","volume":"36 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-03-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140298754","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

Universe inflation and nonlinear electrodynamics 宇宙膨胀与非线性电动力学

arXiv - PHYS - General Physics Pub Date : 2024-03-25 DOI: arxiv-2403.17043

S. I. Kruglov

引用次数: 0

An intrinsic connection of space-time points 时空点的内在联系

arXiv - PHYS - General Physics Pub Date : 2024-03-22 DOI: arxiv-2403.15508

Ty Shedleski, Muhammad Usman

引用次数: 0