The Demonstration of Gravitational Phase Transition inside of Fluid Static Ball

Quantum vacuum effects on the final fate of a collapsing ball of dust

We consider the quantum vacuum effects of the massless scalar fields that are non-minimally coupled to the background geometry of a collapsing homogeneous ball of dust. It is shown that for a definite range of coupling constants, there are repulsive quantum vacuum effects, capable of stopping the collapse process inside the black hole and precluding the formation of singularity. The final fate of the collapse will be a black hole with no singularity, inside which the matter stays balanced. The density of the final static matter will be close to the Planck density. We show that the largest poss…

Gravity Inside a Nonrotating, Homogeneous, Spherical Body

Schwarzschild's 'interior solution' is a space-time metric that satisfies Einstein's gravitational field equations with a source term that Einstein created on the basis of an unjustified identification of the conceptually distinct notions of the passive gravitational mass of matter and the active gravitational mass of matter. Giving up that assumption allows deriving from a variational principle new and better (because logically obtained) field equations that more faithfully extend the Poisson equation for Newton's gravity than do Einstein's, with an active gravitational mass density providing…

Experimental demonstration of metamaterial multiverse in a ferrofluid

Extraordinary light rays propagating inside a hyperbolic metamaterial look similar to particle world lines in a 2+1 dimensional Minkowski spacetime [1]. Magnetic nanoparticles in a ferrofluid are known to form nanocolumns aligned along the magnetic field, so that a hyperbolic metamaterial may be formed at large enough nanoparticle concentration nH. Here we investigate optical properties of such a metamaterial just below nH. While on average such a metamaterial is elliptical, thermal fluctuations of nanoparticle concentration lead to transient formation of hyperbolic regions (3D Minkowski space…

冻结巴丁-狄拉克星与光球

Frozen Bardeen-Dirac stars and light ball

本研究探究巴丁作用量与狄拉克场耦合的静态球对称系统，发现引入狄拉克场后磁荷受限无黑洞解，特定磁荷区间存在内部非奇异的冻结巴丁-狄拉克星，其临界视界内光子速度近零形成光球。

非最小耦合标量场中的非拓扑孤立子：理论与结果

Non - Topological Solitons in non-minimally coupled Scalar fields: Theory and consequences

在动力学引入维数参数的引力理论中，可以得到非拓扑孤子解.本文回顾了与此类解决方案相关的主题。在弯曲时空中，这种解的存在会引起引力球的晕，球内外的引力“常数”不同。这样的g球在星系和星系团尺度上对暗物质问题有着相当有趣的影响。我们描述了这种解决方案的起源。我们推测宇宙学中的相关问题。这样的物体自然会出现在一大类诱导引力模型中，其中我们有非最小耦合到标量曲率的标量场。

长程引力排斥理论中结构形成的研究

Studies in Structure Formation in theories with a repulsive long range gravitational force

本文报道了在一类引力理论中出现的结构。这些理论没有任何视界、平坦性、初始宇宙学奇点和（可能的）量子化问题。该模型的特点是由一个动态引起的引力常量与“错误”的符号对应的排斥引力的大规模。在理论上，该模型中标量场的非最小耦合可以产生非拓扑孤子。这导致了域（引力球），在域中引入了有效的、正则的、吸引的引力常量。我们认为模拟这种解决方案的形成和演变。从一个单一的重力球开始，我们考虑它分裂成更小的（质量更低的）球-通过相互排斥进化。经过几次运行，我们已经能够确定两个参数：长程引力常量的强度和重力球的大小，这可以用来产生适当的两点相关的分布这些球。