Zobrazeno 1 - 10
of 366
pro vyhledávání: '"Fang, L. Z."'
The 21 cm emission and absorption from gaseous halos around the first generation of star depend on the Wouthuysen-Field (W-F) coupling, which relates the spin temperature with the kinetic temperature of hydrogen gas via the resonant scattering betwee
Externí odkaz:
http://arxiv.org/abs/0908.1695
Publikováno v:
Astrophys.J.694:1121-1130,2009
We study the Wouthuysen-Field coupling at early universe with numerical solutions of the integrodifferential equation describing the kinetics of photons undergoing resonant scattering. The numerical solver is developed based on the weighted essential
Externí odkaz:
http://arxiv.org/abs/0812.4104
We investigate the weakly non-linear evolution of cosmic gravitational clustering in phase space by looking at the Zel'dovich solution in the discrete wavelet transform (DWT) representation. We show that if the initial perturbations are Gaussian, the
Externí odkaz:
http://arxiv.org/abs/astro-ph/0102258
Autor:
Lee, W. L., Fang, L. Z.
Publikováno v:
Class.Quant.Grav. 17 (2000) 4467-4480
We investigated the evolution of the primordial density perturbations produced by inflation with thermal dissipation. A full relativistic analysis on the evolution of initial perturbations from the warm inflation era to a radiation-dominated universe
Externí odkaz:
http://arxiv.org/abs/astro-ph/0009060
It is of fundamental importance to determine if and how hierarchical clustering is involved in large-scale structure formation of the universe. Hierarchical evolution is characterized by rules which specify how dark matter halos are formed by the mer
Externí odkaz:
http://arxiv.org/abs/astro-ph/9710204
Publikováno v:
Mon.Not.Roy.Astron.Soc. 276 (1995) 417
In this paper we investigate, using high resolution N-body simulations, the density profiles and the morphologies of galaxy clusters in seven models of structure formation. We show that these properties of clusters are closely related to the occurren
Externí odkaz:
http://arxiv.org/abs/astro-ph/9412072
We investigate, using high resolution N-body simulations, the density profiles and the morphologies of galaxy clusters in three models of structure formation. We show that these properties are closely related to the occurrence of a significant mergin
Externí odkaz:
http://arxiv.org/abs/astro-ph/9411045
Autor:
Jing, Y. P., Fang, L. Z.
Publikováno v:
Astrophys.J. 432 (1994) 438
Using a set of $\pppm$ simulation which accurately treats the density evolution of two components of dark matter, we study the evolution of clusters in the Cold + Hot dark matter (CHDM) model. The mass function, the velocity dispersion function and t
Externí odkaz:
http://arxiv.org/abs/astro-ph/9403012
Autor:
Berera, A., Fang, L. Z.
Publikováno v:
Phys.Rev.Lett. 72 (1994) 458-461
It is shown that the evolution of the density perturbations during certain eras of substantial entropy generation in the universe can be described in the scheme of the KPZ equation. Therefore, the influence on cosmological structure formation by stoc
Externí odkaz:
http://arxiv.org/abs/astro-ph/9401023
Publikováno v:
Astron.Astrophys.284:703-718,1994
Using numerical simulations, we investigate the large-scale gravitational clustering in a flat universe dominated by cold plus hot dark matter (i.e., $\Omega_0=\ocdm+\ohdm+\obaryon=1$). Primordial density fluctuation spectrum is taken to have the Zel
Externí odkaz:
http://arxiv.org/abs/astro-ph/9308017