Cosmological self-similar shock waves and galaxy formation

1983 ◽  
Vol 268 ◽  
pp. 17 ◽  
Author(s):  
E. Bertschinger
Keyword(s):  
Shock Waves ◽  
Galaxy Formation ◽  
Self Similar

scholarly journals Scale Free Processes in Galaxy Formation

2015 ◽  
Vol 11 (A29B) ◽  
pp. 696-698
Author(s):  
Nir Mandelker ◽  
Avishai Dekel
Keyword(s):  
Galaxy Formation ◽  
Cosmic Time ◽  
Mass Range ◽  
Mass Function ◽  
De Sitter ◽  
Scale Free ◽  
Normal Galaxies ◽  
The Galaxy ◽  
Self Similar ◽  
Merger Rate

AbstractAccording to the ΛCDM paradigm of cosmology, galaxies form at the centers of dark matter (DM) halos. While galaxy formation involves complex baryonic physics, the formation of DM halos is governed solely by gravity and cosmology. As a result, many of their properties exhibit a near scale-free behaviour, self-similar in either halo mass, cosmic time or both. This is especially true in the Einstein-de Sitter (EdS) regime, valid at redshifts z ≳ 1, when cosmological scaling relations become particularly simple, and in the narrow mass range of normal galaxies, where the fluctuation power spectrum can be approximated by a power law. Since many galaxy properties are strongly correlated with halo mass, they tend to exhibit a self-similar behaviour as well. A partial list of self-similar properties include the mass function of DM halos, the structure of the cosmic web, the accretion/merger rate of matter onto halos, the density profiles of DM halos and their angular momentum, which eventually determines the galaxy structure. We briefly review these below, and comment on how they can be used in conjunction with simple toy models to gain insight into galaxy formation.

Cylindrical shock and detonation waves in magnetogasdynamics

1969 ◽  
Vol 39 (4) ◽  
pp. 705-725 ◽  
Author(s):  
A. H. Christer ◽  
J. B. Helliwell
Keyword(s):  
Shock Waves ◽  
Strong Shock ◽  
Flow Patterns ◽  
Detonation Waves ◽  
Cylindrically Symmetric ◽  
Constant Strength ◽  
Self Similar ◽  
Axis Of Symmetry ◽  
Similar Solutions ◽  
Shock And Detonation Waves

Self-similar flow patterns are studied which arise when a cylindrically symmetric strong shock or detonation wave propagates outwards into a gas at rest in which the ambient density varies as the inverse square of the distance from the axis of symmetry along which flows a line current of either zero or finite constant strength. The electrical conductivity of the gas on either side of the wave is supposed perfect and the discontinuities discussed are either gasdynamic or magnetogas-dynamic in nature. It is shown that self-similar solutions exist for piston driven gasdynamic detonation and shock waves. Whilst no self-similar solutions may occur for magnetogasdynamic detonation waves, it is demonstrated that magnetogasdynamic shock waves do possess such solutions for which detailed flow patterns are presented.

A self-similar solution of exponential shock waves in non-ideal magnetogasdynamics

Meccanica ◽  
2010 ◽  
Vol 46 (2) ◽  
pp. 437-445 ◽  
Author(s):  
L. P. Singh ◽  
Akmal Husain ◽  
M. Singh
Keyword(s):  
Shock Waves ◽  
Similar Solution ◽  
Self Similar Solution ◽  
Self Similar

Self-similar MHD shock waves for a rotating atmosphere under the force of gravitation

1993 ◽  
Vol 200 (1) ◽  
pp. 27-34 ◽  
Author(s):  
Onkar Nath ◽  
S. N. Ojha ◽  
H. S. Takhar
Keyword(s):  
Shock Waves ◽  
Self Similar ◽  
Mhd Shock Waves
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