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We analyze the SDSS Lyα forest P F (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 de-generacy between(More)
We combine the constraints from the recent Ly forest analysis of the Sloan Digital Sky Survey (SDSS) and the SDSS galaxy bias analysis with previous constraints from SDSS galaxy clustering, the latest supernovae, and 1st year WMAP cosmic microwave background anisotropies. We find significant improvements on all of the cosmological parameters compared to(More)
Using large-scale hydrodynamic simulations with heuristic criteria for galaxy formation, we investigate how the galaxy field is related to physical parameters, such as the mass density and the gas temperature. We find that the relation between the galaxy and mass density fields is a function of scale. The bias b(R) ≡ σ g (R)/σ(R), where σ g (R) is 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)
The dynamics of Local Group and its environment provide a unique challenge to cosmological models. The velocity field within 5h −1 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 −1. We compare the local velocity field with(More)
With a top-heavy initial stellar mass function for Population III stars, as recent simulations seem to suggest, we show that Pop III stars can, for the first time, reionize the universe at z ∼ 15 − 20 in the standard cold dark matter cosmological model. The physical reason rests in the positive feedback from Pop III star formation, made possible by a high(More)