Morphology in Cosmological Gravitational Clustering and Catastrophe Theory
نویسندگان
چکیده
منابع مشابه
Morphology of Clusters and Superclusters in N-body simulations of Cosmological Gravitational Clustering
We analyse shapes of overdense regions (clusters and superclusters) in controlled N-body simulations of gravitational clustering with power law initial spectra P (k) / k, n = 3; 2; 1; 0: At values of the density just above the percolation transition the number of distinct (isolated) clusters peaks and we use this `natural threshold' to study the shapes and multiplicity function of clusters & su...
متن کاملCosmological Models in the Nonsymmetric Gravitational Theory
Cosmological consequences of the nonsymmetric gravitational theory (NGT) are studied. The structure of the NGT field equations is analyzed for an inhomogeneous and anisotropic universe, based on the spherically symmetric field equations. It is assumed that the matter density and pressure are purely time dependent, and it is shown that the field equations allow open, flat and closed universes. T...
متن کاملEvolution of the Potential in Cosmological Gravitational Clustering
In recent years there has been a developing realization that the interesting large–scale structure of voids, “pancakes”, and filaments in the Universe is a consequence of the efficacy of an approximation scheme for cosmological gravitation clustering proposal by Zel’dovich in 1970. However, this scheme was only supposed to apply to smoothed initial conditions. We show that this can be explained...
متن کاملGravitational waves in cosmological models of Hořava-Witten theory
We study the behavior of gravitational waves and their backreaction on the background in cosmological solutions of the five-dimensional Hořava-Witten theory. As a dynamical background, we consider two cosmological solutions with spatially flat expanding FRW branes, called (↑)and (↓)-solutions, in which the orbifold size increases and decreases in time, respectively. For these background solutio...
متن کاملCosmological constant and gravitational theory on D-brane
In a toy model we derive the gravitational equation on a self-gravitating curved D-brane. The effective theory on the brane is drastically changed from the ordinal Einstein equation. The net cosmological constant on the brane depends on a tuning between the brane tension and the brane charges. Moreover, non-zero matter stress tensor exists if the net cosmological constant is not zero. This fact...
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: Progress of Theoretical Physics
سال: 1998
ISSN: 0033-068X,1347-4081
DOI: 10.1143/ptp.99.55