نتایج جستجو برای: strong topological universe
تعداد نتایج: 471206 فیلتر نتایج به سال:
In this letter we propose a physical explanation for recently reported correlations between pairs of close and antipodal gamma-ray bursts from publicly available BATSE catalogue. Our model is based on the cosmological scenario in which bursters are located at cosmological distances of order of 0.5–2 Gpc. Observed distribution of gamma-ray bursts strongly suports this assumption. If so gamma-ray...
We investigate the cosmological consequences of having quantum fields living in a space with compactified dimensions. We will show that the equation of state is not modified by topological effects and so the dynamics of the universe remains as it is in the infinite volume limit. On the contrary the thermal history of the universe depends on terms that are associated with having non-trivial topo...
An introduction to modern cosmology is given, focusing on theories for the origin of structure in the Universe. After a brief review of the theory of growth of cosmological perturbations and a summary of some important observational results, most of the article is devoted to discussions of the inflationary Universe scenario and of topological defect models of structure formation. The final chap...
The asymmetry between matter and antimatter in the Universe indicates that there was a period in the very early Universe when the CPT symmetry was broken. The conservative interpretation is that this CPT breaking was dynamical, induced by the distinguished direction of time stemming from the cosmological expansion. Here, I review the role which topological defect networks may play in baryogenes...
The origin of the large scale structure in the universe — galaxies, quasars, clusters, voids, sheets — is one of the most important questions in cosmology. One can show that some non-thermal energy density fluctuations must have been present in the early universe. These fluctuations grew by gravitational instability to form the observed structures. There are at present two families of models to...
Topological Kondo insulators have been proposed as a new class of topological insulators in which non-trivial surface states reside in the bulk Kondo band gap at low temperature due to strong spin-orbit coupling. In contrast to other three-dimensional topological insulators, a topological Kondo insulator is truly bulk insulating. Furthermore, strong electron correlations are present in the syst...
We present a general formalism for computing Cosmic Background Radiation (CBR) and density uctuations in open models with stii sources. We decompose both the metric uctuations and the uctuations in the stress-energy tensor into scalar, vector and tensor modes. We nd analytic Green's functions for the linearized Einstein equations in the presence of stii sources and use this formalism to estimat...
We discuss the formation of nontopological solitons in a second-order phase transition in the early Universe. Ratios of dimensionless coupling constants in the Lagrangian determine their abundance and mass. For a large range of parameters, non-topological solitons can be cosmologically significant, contributing a significant fraction of the present mass density of the Universe. Submitted to Phy...
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