منابع مشابه
On Gravitational Repulsion
The concepts of negative gravitational mass and gravitational repulsion are alien to general relativity. Still, we show here that small negative fluctuations small dimples in the primordial density field that act as if they have an effective negative gravitational mass, play a dominant role in shaping our Universe. These initially tiny perturbations repel matter surrounding them, expand and gro...
متن کاملImplications of Cosmic Repulsion for Gravitational Theory∗
In this paper we present a general, model independent analysis of a recently detected apparent cosmic repulsion, and discuss its potential implications for gravitational theory. In particular, we show that a negatively spatially curved universe acts like a diverging refractive medium, to thus naturally cause galaxies to accelerate away from each other. Additionally, we show that it is possible ...
متن کاملGeodesics in a Quasi–spherical Spacetime: a Case of Gravitational Repulsion
Geodesics are studied in one of the Weyl metrics, referred to as the M–Q solution. First, arguments are provided, supporting our belief that this space–time is the more suitable (among the known solutions of the Weyl family) for discussing the properties of strong quasi–spherical gravitational fields. Then, the behaviour of geodesics is compared with the spherically symmetric situation, bringin...
متن کاملFast Surface Particle Repulsion
A fast algorithm for simulating particle repulsion on surfaces is described. Particles are distributed across a surface and made to repel. Calculating pairwise repulsion between n particles costs O(n2) in general, but if the energy potential drops off very rapidly, repulsion can be simulated in O(n) time. This is accomplished using a simple grid data structure with spherical range queries. Part...
متن کاملPattern Repulsion Revisited
Marques and Almeida [9] recently proposed a nonlinear data seperation technique based on the maximum entropy principle of Bell and Sejnowsky. The idea behind is a pattern repulsion model alluding to repulsion of physical particles in a restricted system which leads to a uniform distribution, hence a maximum entropy, under certain conditions to the energy function. In this paper, we want to revi...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Science
سال: 1917
ISSN: 0036-8075,1095-9203
DOI: 10.1126/science.46.1186.293