arXiv - PHYS - General Physics最新文献_第6页

Group-theoretical classification of orientable objects and particle phenomenology 可定向物体的群论分类和粒子现象学

arXiv - PHYS - General Physics Pub Date : 2024-05-31 DOI: arxiv-2406.00089

D. M. Gitman, A. L. Shelepin

{"title":"Group-theoretical classification of orientable objects and particle phenomenology","authors":"D. M. Gitman, A. L. Shelepin","doi":"arxiv-2406.00089","DOIUrl":"https://doi.org/arxiv-2406.00089","url":null,"abstract":"In our previous works, we have proposed a quantum description of relativistic\u0000orientable objects by a scalar field on the Poincar'{e} group. This\u0000description is, in a sense, a generalization of ideas used by Wigner, Casimir\u0000and Eckart back in the 1930's in constructing a non-relativistic theory of a\u0000rigid rotator. The present work is a continuation and development of the above\u0000mentioned our works. The position of the relativistic orientable object in\u0000Minkowski space is completely determined by the position of a body-fixed\u0000reference frame with respect to the space-fixed reference frame, and can be\u0000specified by elements $q$ of the motion group of the Minkowski space - the\u0000Poincar'e group $M(3,1)$. Quantum states of relativistic orientable objects\u0000are described by scalar wave functions $f(q)$ where the arguments $q=(x,z)$\u0000consist of Minkowski space-time points $x$, and of orientation variables $z$\u0000given by elements of the matrix $Zin SL(2,C)$. Technically, we introduce and\u0000study the so-called double-sided representation\u0000$boldsymbol{T}(boldsymbol{g})f(q)=f(g_l^{-1}qg_r)$,\u0000$boldsymbol{g}=(g_l,g_r)in boldsymbol{M}$, of the group $boldsymbol{M}$, in\u0000the space of the scalar functions $f(q)$. Here the left multiplication by\u0000$g_l^{-1}$ corresponds to a change of space-fixed reference frame, whereas the\u0000right multiplication by $g_r$ corresponds to a change of body-fixed reference\u0000frame. On this basis, we develop a classification of the orientable objects and\u0000draw the attention to a possibility of connecting these results with the\u0000particle phenomenology. In particular, we demonstrate how one may identify\u0000fields described by linear and quadratic functions of $z$ with known elementary\u0000particles of spins $0$,$frac{1}{2}$, and $1$. The developed classification\u0000does not contradict the phenomenology of elementary particles and, moreover, in\u0000some cases give its group-theoretic explanation.","PeriodicalId":501190,"journal":{"name":"arXiv - PHYS - General Physics","volume":"77 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-05-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141259144","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

The smeared-horizon observer of a black hole 黑洞的黑域观测器

arXiv - PHYS - General Physics Pub Date : 2024-05-29 DOI: arxiv-2405.19560

Theodorus Maria Nieuwenhuizen

引用次数: 0

Thermodynamics of the most generalized form of Holographic Dark Energy and some particular cases with Corrected Entropies 全息暗能量最广义形式的热力学以及具有校正熵的一些特殊情况

arXiv - PHYS - General Physics Pub Date : 2024-05-29 DOI: arxiv-2405.20783

Sanghati Saha, Ertan Güdekli, Surajit Chattopadhyay

{"title":"Thermodynamics of the most generalized form of Holographic Dark Energy and some particular cases with Corrected Entropies","authors":"Sanghati Saha, Ertan Güdekli, Surajit Chattopadhyay","doi":"arxiv-2405.20783","DOIUrl":"https://doi.org/arxiv-2405.20783","url":null,"abstract":"The holographic cut-off in generalized dark energy (HDE) formalism depends on\u0000its cut-off. Following this, a four-parameter generalized entropy has recently\u0000been developed. It reduces to various known entropies for appropriate parameter\u0000limits in the study of Odintsov, S. D., S. DOnofrio, and T. Paul. (2023)\u0000Physics of the Dark Universe, 42 pp: 101277. In the current work, we\u0000investigate the evolution of the universe in its early phase and late phase\u0000within the framework of entropic cosmology, where the entropic energy density\u0000functions are reconstructed within the framework of the equivalence of\u0000holographic dark energy and four-parameter generalized entropy (Sg). Along with\u0000the reconstruction as mentioned earlier scheme, in this study, we demonstrate\u0000that an extensive variety of dark energy (DE) models can be considered distinct\u0000and particular candidates for the most generalized four-parameter entropic HDE\u0000family, each having their cut-off. We examined several entropic dark energy\u0000models in this regard, including the generalized holographic dark energy with\u0000Nojiri-Odintsov(NO) cut-off, the Barrow entropic HDE (BHDE) with particle\u0000horizon as IR cut-off, the Tsallis entropic HDE (THDE) with future event\u0000horizon as IR cut-off, all of three cases are particular cases of the most\u0000generalized four parameter entropic holographic dark energy. Inspired by S.\u0000Nojiri, and S. D. Odintsov (2006) (General Relativity and Gravitation, 38 p:\u00001285-1304 ) and (S. Nojiri and S. D. Odintsov, 2017, European Physical Journal\u0000C, 77, pp.1-8 ); our current work reports a study on cosmological parameters\u0000and thermodynamics with entropy-corrections (logarithmic and power-law) to\u0000cosmological horizon entropy as well as black hole entropy with a highly\u0000generalized viscous coupled holographic dark fluid along its particular cases.","PeriodicalId":501190,"journal":{"name":"arXiv - PHYS - General Physics","volume":"30 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-05-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141259149","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

Simulating Physics with Computers 用计算机模拟物理

arXiv - PHYS - General Physics Pub Date : 2024-05-28 DOI: arxiv-2405.20780

Søren Toxvaerd

{"title":"Simulating Physics with Computers","authors":"Søren Toxvaerd","doi":"arxiv-2405.20780","DOIUrl":"https://doi.org/arxiv-2405.20780","url":null,"abstract":"Feynman gave in 1982 a keynote speech textit{Simulating Physics with\u0000Computers} (Int. J. Theor. Phys. {bf 21}, 467 (1982)) in which he talked\u0000``...about the possibility...that the computer will do exactly the same as\u0000nature\". The motivation was that: ``...the physical world is quantum\u0000mechanical, and therefore the proper problem is the simulation of quantum\u0000physics\". Here I try after more than forty years to answer Feynman's question\u0000of whether it is possible to perform exact computer simulations. Many computer\u0000simulations are not exact, they contain mean field approximations that disobey\u0000the symmetry in the quantum dynamics with Newton's third law, e.g. almost all\u0000astrophysical simulations of galaxy systems. After a review of computer\u0000simulations and the problems of simulating real systems, I argue that Newton's\u0000discrete dynamics, which is used in almost all computer simulations and which\u0000is exact in the same sense as Newton's analytic dynamics, is the classical\u0000limit path of Feynman's quantum paths. However, the physical world is not known\u0000exactly and it is much more complex than any simulated systems, and so far no\u0000real systems have been simulated exactly. Hence, more than forty years later,\u0000and after hundreds of thousands of computer simulations of the physical\u0000system's dynamics the answer to Feynman's question is still negative. But\u0000although it is not possible to simulate the dynamics exactly for any real\u0000systems, the simulations have been and will be of great use in Natural Science.","PeriodicalId":501190,"journal":{"name":"arXiv - PHYS - General Physics","volume":"12 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-05-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141259541","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 meaning of electromagnetic mass and 4/3-problem 电磁质量的物理意义和 4/3 问题

arXiv - PHYS - General Physics Pub Date : 2024-05-28 DOI: arxiv-2405.20781

Vladimir Onoochin

引用次数: 0

A derivation of the first generation particle masses from internal spacetime 从内部时空推导第一代粒子质量

arXiv - PHYS - General Physics Pub Date : 2024-05-24 DOI: arxiv-2405.15522

Charlie Beil

{"title":"A derivation of the first generation particle masses from internal spacetime","authors":"Charlie Beil","doi":"arxiv-2405.15522","DOIUrl":"https://doi.org/arxiv-2405.15522","url":null,"abstract":"Internal spacetime geometry was recently introduced to model certain quantum\u0000phenomena using spacetime metrics that are degenerate. We use the Ricci tensors\u0000of these metrics to derive a ratio of the bare up and down quark masses,\u0000obtaining $m_u/m_d = 9604/19683 approx .4879$. This value is within the\u0000lattice QCD value at $2 operatorname{GeV}$ in the\u0000$overline{operatorname{MS}}$-scheme, $.473 pm .023$. Moreover, using the\u0000Levi-Cevita Poisson equation, we derive ratios of the dressed electron mass and\u0000bare quark masses. For a dressed electron mass of $.511 operatorname{MeV}$,\u0000these ratios yield the bare quark masses $m_u approx 2.2440\u0000operatorname{MeV}$ and $m_d approx 4.599 operatorname{MeV}$, which are\u0000within/near the lattice QCD values $m^{overline{operatorname{MS}}}_u =\u0000(2.20pm .10) operatorname{MeV}$ and $m^{overline{operatorname{MS}}}_d =\u0000(4.69 pm .07) operatorname{MeV}$. Finally, using $4$-accelerations, we derive\u0000the ratio $tilde{m}_u/tilde{m}_d = 48/49 approx .98$ of the constituent up\u0000and down quark masses. This value is within the $.97 sim 1$ range of\u0000constituent quark models. All of the ratios we obtain are from first principles\u0000alone, with no free or ad hoc parameters. Furthermore, and rather curiously,\u0000our derivations do not use quantum field theory, but only tools from general\u0000relativity.","PeriodicalId":501190,"journal":{"name":"arXiv - PHYS - General Physics","volume":"8 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-05-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141168798","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

Bell inequalities violation in relativity theory 相对论中的贝尔不等式违反

arXiv - PHYS - General Physics Pub Date : 2024-05-22 DOI: arxiv-2405.20789

Alexander Belinsky, Igor Dzhadan

引用次数: 0

Magnetic black hole thermodynamics in an extended phase space with nonlinear electrodynamics 具有非线性电动力学的扩展相空间中的磁性黑洞热力学

arXiv - PHYS - General Physics Pub Date : 2024-05-21 DOI: arxiv-2405.13210

S. I. Kruglov

引用次数: 0

Photon under repeated transverse Lorentz boosts: An apparent paradox 光子在反复的横向洛伦兹增强作用下：一个明显的悖论

arXiv - PHYS - General Physics Pub Date : 2024-05-21 DOI: arxiv-2405.15504

Tugdual LeBohec