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We analyze the SDSS Lyα forest PF (k, z) measurement to determine the linear theory power spectrum. Our analysis is based on fully hydrodynamic simulations, extended using hydro-PM simulations. We account for the effect of absorbers with damping wings, which leads to an increase in the slope of the linear power spectrum. We break the degeneracy between the(More)
It is demonstrated that strong magnetic fields are produced from a zero initial magnetic field during the pregalactic era, when galaxies are first forming. Their development proceeds in three phases. In the first phase, weak magnetic fields are created by the Biermann battery mechanism, acting in shocked parts of the intergalactic medium where caustics form(More)
Uroš Seljak, Alexey Makarov, Patrick McDonald, Scott F. Anderson, Neta A. Bahcall, J. Brinkmann, Scott Burles, Renyue Cen, Mamoru Doi, James E. Gunn, Željko Ivezić, Stephen Kent, Jon Loveday, Robert H. Lupton, Jeffrey A. Munn, Robert C. Nichol, Jeremiah P. Ostriker, David J. Schlegel, Donald P. Schneider, Max Tegmark, Daniel E. Vanden Berk, David H.(More)
The canonical cosmological constant dominated cold dark matter model (ΛCDM ) may possess too much power on small scales at z = 0, manifested as central over-concentration of dark matter and over-abundance of dwarf galaxies. We suggest an alternative model, ΛDCDM, where one half of the cold dark matter particles decay into relativistic particles by z = 0.(More)
SCORCH (Simulations and Constructions of the Reionization of Cosmic Hydrogen) is a new project to study the Epoch of Reionization (EoR). In this first paper, we probe the connection between observed high-redshift galaxies and simulated dark matter halos to better understand the primary source of ionizing radiation. High-resolution N-body simulations are run(More)
Weak gravitational lensing by large-scale structure affects the determination of the cosmological deceleration parameter q0. We find that the lensing induced dispersions on truly standard candles are 0.04 and 0.02 mag at redshift z = 1 and z = 0.5, respectively, in a COBE-normalized cold dark matter universe with Ω0 = 0.40, Λ0 = 0.6, H = 65km/s/Mpc and σ8 =(More)
The dynamics of Local Group and its environment provide a unique challenge to cosmological models. The velocity field within 5h Mpc of the Local Group (LG) is extremely “cold”. The deviation from a pure Hubble flow, characterized by the observed radial peculiar velocity dispersion, is measured to be ∼ 60km s. We compare the local velocity field with(More)
Cosmological hydrodynamic simulations have significantly improved over the past several years, and we have already shown that the observed properties of Lymanbreak galaxies (LBGs) at z = 3 can be explained well by the massive galaxies in the simulations. Here we extend our study to z = 6 and show that we obtain good agreement for the LBGs at the bright-end(More)