scholarly journals Are there Ghost Images of the Coma Cluster at other Redshifts?

1999 ◽  
Vol 183 ◽  
pp. 263-263
Author(s):  
Boudewijn F. Roukema
Keyword(s):  
Fundamental Property ◽  
Infinite Volume ◽  
Coma Cluster ◽  
Negatively Curved ◽  
Image Position ◽  
Topology Of The Universe ◽  
The Universe ◽  
Ghost Images

The topology of the Universe is a fundamental property of our Universe according to Friedmann-Lemaître models[3, 9, 7], but has not yet been reliably measured. As pointed out by Sato[12], the Universe may be finite even though flat or negatively curved: infinite volume of a hypersurface.

Wormholes and large-scale topology of the Universe

1996 ◽  
Vol 111 (12) ◽  
pp. 1433-1438 ◽  
Author(s):  
Zhen-Qiang Tan ◽  
You-Gen Shen
Keyword(s):  
Large Scale ◽  
Topology Of The Universe ◽  
The Universe

Signature of Topology of the Universe

2018 ◽  
Vol 2 (01) ◽  
Author(s):  
Vipin Kumar Sharma
Keyword(s):  
General Relativity ◽  
Energy Density ◽  
Local Geometry ◽  
Microwave Background ◽  
Main Motivation ◽  
And Topology ◽  
The Standard Model ◽  
Topology Of The Universe ◽  
The Universe ◽  
Insight Into

The main motivation to write this article is to relate the cosmology and topology in order to gain some insight into the topological signatures of the Standard model of Universe. The theory of General Relativity as given by Einstein only describes the local geometry of space but not global, hence leaves the possibility to explore the topology of the space (simply- or multi-connected). By expressing the cosmological model in trms of energy density parameters, we attempt to understand the geometry of spacetime. This is followed by a discussion on the possibility to detect the signatures of topology of space imprinted on the Cosmic Microwave Background (CMB).

Topology of the Universe

1987 ◽  
pp. 461-475 ◽  
Author(s):  
L. Z. Fang ◽  
H. J. Mo
Keyword(s):  
Topology Of The Universe ◽  
The Universe

scholarly journals Local Group Dynamics

1999 ◽  
Vol 192 ◽  
pp. 39-50 ◽  
Author(s):  
D. Lynden-Bell
Keyword(s):  
Group Dynamics ◽  
Local Group ◽  
Big Bang ◽  
Distance Scale ◽  
Image Position ◽  
The Big Bang ◽  
The Universe

The distance from the Local Group to the ‘sphere’ of small galaxies that no longer expand with the Universe determines the time since the Big Bang, t x M1/2, where M is the mass of the Local Group. Adopting Feast's new distance scale, this distance is found to be 1.35 ± 0.1 Mpc. The velocity of approach and the distance to M31 give a different combination of t and M, thus both can be deduced. We find the time since the Big Bang and The importance of accurate distances for such results is stressed. If all distances are revised by a factor λ then both t and M change by that factor.

scholarly journals ALL UNIVERSES GREAT AND SMALL

2001 ◽  
Vol 10 (06) ◽  
pp. 785-790 ◽  
Author(s):  
JOHN D. BARROW ◽  
HIDEO KODAMA
Keyword(s):  
Compact Space ◽  
Present State ◽  
Initial Conditions ◽  
Cosmological Models ◽  
Topology Of The Universe ◽  
The Universe

If the topology of the universe is compact we show how it significantly changes our assessment of the naturalness of the observed structure of the universe and the likelihood of its present state of high isotropy and near flatness arising from generic initial conditions. We also identify the most general cosmological models with compact space.

scholarly journals Relativistic plasma and ICM/radio source interaction

2010 ◽  
Vol 6 (S274) ◽  
pp. 340-347 ◽  
Author(s):  
Luigina Feretti ◽  
Gabriele Giovannini ◽  
Federica Govoni ◽  
Matteo Murgia
Keyword(s):  
Magnetic Fields ◽  
Radio Source ◽  
Large Scale ◽  
Large Scale Structure ◽  
Radio Sources ◽  
Relativistic Electrons ◽  
Coma Cluster ◽  
Cluster Of Galaxies ◽  
Formation And Evolution ◽  
The Universe

AbstractThe first detection of a diffuse radio source in a cluster of galaxies, dates back to the 1959 (Coma Cluster, Large et al. 1959). Since then, synchrotron radiating radio sources have been found in several clusters, and represent an important cluster component which is linked to the thermal gas. Such sources indicate the existence of large scale magnetic fields and of a population of relativistic electrons in the cluster volume. The observational results provide evidence that these phenomena are related to turbulence and shock-structures in the intergalactic medium, thus playing a major role in the evolution of the large scale structure in the Universe. The interaction between radio sources and cluster gas is well established in particular at the center of cooling core clusters, where feedback from AGN is a necessary ingredient to adequately describe the formation and evolution of galaxies and host clusters.

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