Evolution of superclusters and supercluster cocoons in various cosmologies
, 2021 We investigate the evolution of superclusters and supercluster cocoons (basins of attraction), and the influence of cosmological parameters to the evolution.
Einasto, J. +4 more
core +1 more source
Quasar number density evolution
The Astrophysical Journal, 1981 A simple model of quasar number density evolution is presented based on the occurrence of quasar-like radio galaxies (i.e., strong optical emission lines and type 2 radio morphology) exclusively in regions of low galaxy and intergalactic medium (IGM) density.
J. T. Stocke, S. C. Perrenod
openaire +1 more source
The Linear Boltzmann Equation as the Low Density Limit of a Random Schrodinger Equation [PDF]
, 2005 We study the evolution of a quantum particle interacting with a random potential in the low density limit (Boltzmann-Grad). The phase space density of the quantum evolution defined through the Husimi function converges weakly to a linear Boltzmann ...
DAVID ENG +3 more
core +3 more sources
A mathematical analysis of the evolution of perturbations in a modified Chaplygin gas model [PDF]
, 2007 One approach in modern cosmology consists in supposing that dark matter and dark energy are different manifestations of a single `quartessential' fluid.
A. Dev +53 more
core +2 more sources
Phase Information and the Evolution of Cosmological Density Perturbations [PDF]
, 1999 The Fourier transform of cosmological density perturbations can be represented in terms of amplitudes and phases for each Fourier mode. We investigate the phase evolution of these modes using a mixture of analytical and numerical techniques.
Chiang, Lung-Yih, Coles, Peter
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EVOLUTION OF DENSITY PERTURBATIONS IN LARGE VOID UNIVERSE [PDF]
The Thirteenth Marcel Grossmann Meeting, 2012 23 pages, 8 figures; added references for section ...
Nishikawa, Ryusuke +2 more
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Supernova progenitors and iron density evolution from SN rate evolution measurements
, 2008 Using an extensive compilation of literature supernova rate data we study to which extent its evolution constrains the star formation history, the distribution of the type Ia supernova (SNIa) progenitor's lifetime, the mass range of core-collapse ...
Blanc, Guillaume, Greggio, Laura
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Local Lagrangian Approximations for the Evolution of the Density Distribution Function in Large-Scale Structure [PDF]
, 1996 We examine local Lagrangian approximations for the gravitational evolution of the density distribution function. In these approximations, the final density at a Lagrangian point q at a time t is taken to be a function only of t and of the initial density
Protogeros, Zacharias A. M. +1 more
core +2 more sources
Quantum stochastic equation for the low density limit [PDF]
, 2002 A new derivation of quantum stochastic differential equation for the evolution operator in the low density limit is presented. We use the distribution approach and derive a new algebra for quadratic master fields in the low density limit by using the ...
Accardi, L. +2 more
core +2 more sources
A Simple Model for Quasar Density Evolution [PDF]
, 2007 It is widely agreed upon that AGN and Quasars are driven by gas accretion onto a supermassive black hole. The origin of the latter however still remains an open question. In this work we present the results of an extremely simple cosmological model combined with an evolutionary scenario in which both the formation of the black hole as well as the gas ...
Horst, Hannes, Duschl, Wolfgang J.
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