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Quantifying the impact of baryon-CDM perturbations on halo clustering and baryon fraction
Hasti Khoraminezhad, Titouan Lazeyras, Raul E. Angulo +2
Baryons and cold dark matter (CDM) did not comove prior to recombination. This leads to differences in the local baryon and CDM densities, the so-called baryon-CDM isocurvature per…
Intrinsic Alignments in IllustrisTNG and their implications for weak lensing: Tidal shearing and tidal torquing mechanisms put to the test
Jolanta Zjupa, Björn Malte Schäfer, Oliver Hahn
Accurate measurements of the cosmic shear signal require a separation of the true weak gravitational lensing signal from intrinsic shape correlations of galaxies. These `intrinsic…
Shell-crossing in a CDM Universe
Cornelius Rampf, Oliver Hahn
Perturbation theory is an indispensable tool for studying the cosmic large-scale structure, and establishing its limits is therefore of utmost importance. One crucial limitation of…
A sea of tides: star formation and the central-satellite dichotomy in a continuum of tidal environments
Jolanta Zjupa, Aseem Paranjape, Oliver Hahn +1
The environment-dependent bimodality of the distribution of stellar mass () and specific star formation rate (sSFR) of galaxies, and its explanation in terms of the central…
Accurate initial conditions for cosmological N-body simulations: Minimizing truncation and discreteness errors
Michaël Michaux, Oliver Hahn, Cornelius Rampf +1
Inaccuracies in the initial conditions for cosmological N-body simulations could easily be the largest source of systematic error in predicting the non-linear large-scale structure…
Higher-order initial conditions for mixed baryon-CDM simulations
Oliver Hahn, Cornelius Rampf, Cora Uhlemann
We present a novel approach to generate higher-order initial conditions (ICs) for cosmological simulations that take into account the distinct evolution of baryons and dark matter.…