ABSTRACT Matter in the Universe is arranged a cosmic web, with filament of matter typically connecting each neighbouring galaxy pair, separated by tens millions light-years. A quadrupolar pattern spin field around filaments known to influence spins galaxies and haloes near them, but it remains unknown whether themselves spin. Here, we measure dark velocities cosmological simulations, finding th...

We summarize recent results assessing the carbon and silicon abundances of the intergalactic medium (IGM) using the ‘pixel optical depth’ technique. We briefly discuss the implications of these results for models of intergalactic enrichment, focusing on distinguishing ‘early’ z ≫ 4 enrichment by the first generations of stars and objects from ‘late’ enrichment by 2 ∼ z ∼ 5 Lybreak galaxies. We ...

We derive new constraints on models of decaying and annihilating dark matter (DM) by requiring that the energy injected into intergalactic medium (IGM) not overheat it at late times, when measurements Lyman-$\alpha$ forest constrain IGM temperature. improve upon previous analyses using recently developed $\texttt{DarkHistory}$ code package, which self-consistently takes account additional photo...

We present a general framework for obtaining robust bounds on the nature of dark matter using cosmological $N$-body simulations and Lyman-alpha forest data. construct an emulator hydrodynamical simulations, which is flexible, accurate computationally efficient model predicting response flux power spectrum to different models, state intergalactic medium (IGM) primordial spectrum. The combines fl...

The observed dynamics of gas and stars on galactic and larger scales cannot be accounted for by self-gravity, indicating that there are large quantities of unseen matter, or that gravity is non-Newtonian in these regimes. Milgrom’s MOdified Newtonian Dynamics (MOND) postulates that Newton’s laws are modified at very low acceleration, and can account for the rotation curves of galaxies and some ...

A new method is developed to calculate the amplitude of the galactic warps generated by a torque due to external forces. This takes into account that the warp is produced as a reorientation of the different rings which constitute the disc in order to compensate the differential precession generated by the external force, yielding a uniform asymptotic precession for all rings. Application of thi...

In 1937, Paul Dirac proposed: the Large Number Hypothesis and of variable gravitational “constant”; later added notion continuous creation Matter in World. The developed Hypersphere World-Universe Model (WUM) follows these ideas, albeit introducing a different mechanism matter creation. this paper, we show that WUM is natural continuation Classical Physics, it can already serve as basis for New...

We use numerical simulations of structure formation in a Cold Dark Matter model to predict the absorption lines in the soft X-rays produced by heavy elements in the shock-heated intergalactic medium at low redshift. The simulation incorporates a model for heavy element production in galaxies and the subsequent dispersion of the metals to the intergalactic medium. We analyze in particular absorp...