Farook Rahaman, Mubasher Jamil, Kaushik Chakraborty
Electron is modeled as a spherically symmetric charged perfect fluid distribution of matter. The existing model is extended assuming a matter source that is characterized by quadratic EoS in the context of general theory of relativity. For the suitable choices of the parameters, our charged fluid models almost satisfy the physical properties of electron.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
继续探索
In this paper we study some features of the Reissner-Nordström metric both from an analytic and a visual point of view. We perform an accurate ray tracing and study of null geodesics in various situations. Among the issues we focus on are (i) the comparison with the Schwarzschild case, (ii) the naked singularity case, where, if the electric charge is not too large, some dark shell appears on images despite there is no horizon in the metric, and (iii) the wormhole crossing case, i.e., a visual exploration of the maximal analytic extension of the metric.
Revisiting the Entangled Relativity gravity framework
本文重访纠缠相对论框架，将其嵌入更广理论集合，通过标量-张量重构和内禀解耦条件，提出满足条件的理想流体拉格朗日量，并指出其作为广义相对论替代方案的潜力，但需重新审视守恒律与观测数据关联。
Revisiting Stability in New General Relativity
以规范不变方式研究新广义相对论在 Minkowski 背景下的自由度，发现一般理论存在矢量模式不稳定性，并找到两个无不稳定的新分支，证明存在三种而非先前文献所述的一种无不稳定情形。
The existence of extremely dark and compact astronomical bodies is by now a well established observational fact. On the other hand, classical General Relativity predicts the existence of black holes which fit very well with the observations, but do lead to important conceptual problems. In this contribution we ask ourselves the straightforward question: Are the dark and compact objects that we have observational evidence for black holes in the sense of General Relativity? By revising the semiclassical scenario of stellar collapse we find out that as the result of a collapse some alternative ob…
The dual dynamics of Einstein gravity on AdS$_3$ supplemented with boundary conditions of KdV-type is identified. It corresponds to a two-dimensional field theory at the boundary, described by a novel action principle whose field equations are given by two copies of the "potential modified KdV equation". The asymptotic symmetries then transmute into the global Noether symmetries of the dual action, giving rise to an infinite set of commuting conserved charges, implying the integrability of the system. Noteworthy, the theory at the boundary is non-relativistic and possesses anisotropic scaling …
Revisiting black holes surrounded by cloud and fluid of strings in general relativity
该研究在广义相对论框架下重新探究被弦云与弦流体围绕的黑洞，推导带可变参数弦流体的场方程通解，提出新型正则黑洞解，揭示弦流体与Kiselev流体的结构相似性，并分析其热力学、测地线及阴影等性质。
Revisiting Wormhole Solutions in Unimodular Gravity: Energy Conditions and Exotic Matter Requirements
本文重新审视单模引力中的虫洞解，指出先前关于普通物质可维持虫洞的结论不准确，并证实奇异物质仍为必要，与广义相对论的理论约束一致。
We study the solution space of general relativistic, axisymmetric, equilibria of differentially rotating neutron stars with realistic, nuclear equations of state. We find that different types of stars, which were identified by earlier works for polytropic equations of state, arise for realistic equations of state, too. Scanning the solution space for the sample of realistic equations of state we treat, we find lower limits on the maximum rest masses supported by cold, differentially rotating stars for each type of stars. We often discover equilibrium configurations that can support more than 2…
Natural Emergence of LCDM Cosmology within General Relativity from Two Alternative Frameworks Without Fine-Tuning and Coincidence
通过广义相对论中的对称性打破机制，从两个替代框架自然推导出LCDM模型，解决精细调节和巧合问题。
Revisiting the static spherically symmetric solutions of gravity with a conformally coupled scalar field
该研究重访任意维共形耦合标量场的引力静态球对称解，用四阶张量改写场方程阐明解的对偶映射，发现含BBMB黑洞等的双参数对偶解子族，还通过直接积分与新假设重推三参数解族。
Revisiting loop quantum gravity with selfdual variables: Classical theory
本文在自对偶变量框架下重新审视圈量子引力的经典理论，阐明SL(2,C)联络分解、全纯相空间结构及现实条件的处理方式，为量子化提供新的经典基础。
Electron accelerations of the order of $10^{21} g$ obtained by laser fields open up the possibility of experimentally testing one of the cornerstones of general relativity, the weak equivalence principle, which states that the local effects of a gravitational field are indistinguishable from those sensed by a properly accelerated observer in flat space-time. We illustrate how this can be done by solving the Einstein equations in vacuum and integrating the geodesic equations of motion for a uniformly accelerated particle.
Revisiting Coincident GR in Internal STEGR Formulation
基于内部空间形式的 STEGR 规范引力方法重新审视 CGR，回顾其标准形式，推导规范方法中的场方程并讨论相关问题，在重合规范下从多方面推导 CGR 并给出测试标量粒子运动。
Revisiting black holes in dark-matter halos: on consistent solutions to the Einstein equations
本文探讨了暗物质晕中黑洞的爱因斯坦方程解问题，指出牛顿近似在致密天体附近的有效性受限，并提出了一致的构造框架。
We consider the so-called semiclassical variant of general relativity, where gravitational field is not quantized but matter is quantized, for the simplest composite quantum body - a hydrogen atom. We create a stationary electron quantum state in the atom in the absence of gravitational field and study its time evolution in the presence of the field, using the local Lorentz invariance property of spacetime. It is shown that this state with a definite energy in the absence of gravitational field is not anymore a stationary state in the field. Therefore, quantum measurements of passive gravitati…
We consider a static spherically symmetric charged anisotropic fluid source of finite physical radius (\sim 10^{-16} cm) by introducing a scalar variable Λdependent on the radial coordinate r under general relativity. From the solution sets a possible role of the cosmological constant is investigated which indicates the dependency of energy density of electron on the variable Λ.
Deformed Special Relativity (DSR) is a generalization of Special Relativity based on a deformed Minkowski space, i.e. a four-dimensional space-time with metric coefficients depending on the energy. We show that, in the DSR framework, it is possible to derive the value of the electron mass from the space-time geometry via the experimental knowledge of the parameter of local Lorentz invariance breakdown, and of the Minkowskian threshold energy $E_{0,em}$ for the electromagnetic interaction.
On June 5, 1905 Poincaré presented a Note to the Académie des Sciences entitled "Sur la dynamique de l'électron" ("On the Dynamics of the Electron"). After briefly recalling the context that led Poincaré to write this Note, we comment its content. We emphasize that Poincaré's electron model consists in assuming that the interior of the worldtube of the (hollow) electron is filled with a positive cosmological constant. We then discuss the several novel contributions to the physico-mathematical aspects of Special Relativity which are sketched in the Note, though they are downplayed by Poincaré w…
Revisiting and extending an old idea of Michel Hénon, we geometrically and algebraically characterize the whole set of isochrone potentials. Such potentials are fundamental in potential theory. They appear in spherically symmetrical systems formed by a large amount of charges (electrical or gravitational) of the same type considered in mean-field theory. Such potentials are defined by the fact that the radial period of a test charge in such potentials, provided that it exists, depends only on its energy and not on its angular momentum. Our characterization of the isochrone set is based on the …
We highlight four points which have been ignored or underestimated before and which allow a better understanding of "Sur la dynamique de l'electron": (i) the use by Poincare of active Lorentz transformations (boosts); (ii) the necessity, required by mechanics, of a group condition l=1 eliminating dilations; (iii) the key role of the action (electromagnetic or not) and of its invariance; (iv) the mathematical status of electron models as example or counter-example.
A geometrical meaning to the electron mass from breakdown of Lorentz invariance
本文在变形狭义相对论框架下提出电子质量可由时空几何导出，并将质量生成与质量对度规背景的依赖性联系起来。
The deflection of gamma-rays in Earth's gravitational field is tested in laser Compton scattering at high energy accelerators. Within a formalism connecting the bending angle to the photon's momentum it follows that detected gamma-ray spectra are inconsistent with a deflection magnitude of 2.78 nrad, predicted by Einstein's gravity theory. Moreover, preliminary results for 13-28 GeV photons from two different laboratories show opposite - away from the beam line - deflection, amounting to 33.8-0.8 prad. These conclusions, however, are applicable only for gravitationally sterile high energy elec…
扫码添加微信好友，提出您的宝贵建议 👇
💡 备注请填写：网站反馈
发表机构由 AI 从论文文本抽取，如发现错误，欢迎反馈修正建议。