383 citations · 9k across the 157 of their papers we have counts for
52 papers · 1 filter
A Dynamical Classification of the Cosmic Web
J. E. Forero-Romero, Y. Hoffman, S. Gottloeber +2
A dynamical classification of the cosmic web is proposed. The large scale environment is classified into four web types: voids, sheets, filaments and knots. The classification is b…
Disk Evolution and Bar Triggering Driven by Interactions with Dark Matter Substructure
Emilio Romano-Diaz, Isaac Shlosman, Clayton Heller +1
We study formation and evolution of bar-disk systems in fully self-consistent cosmological simulations of galaxy formation in the LCDM WMAP3 Universe. In a representative model we…
Phase-Space Density Profiles in Scale-Free Cosmologies
Steffen R. Knollmann, Alexander Knebe, Yehuda Hoffman
We use a set of high-resolution simulations of scale-free Einstein-de Sitter cosmologies to investigate the logarithmic slope of the phase-space density profile $Q(r) = ρ(r)/σ^3(r)…
On the relation between radial alignment of dark matter subhalos and host mass in cosmological simulations
Alexander Knebe, Nadya Draganova, Chris Power +4
We explore the dependence of the radial alignment of subhalos on the mass of the host halo they orbit in. As the effect is seen on a broad range of scales including massive cluster…
The distribution function of dark matter in massive haloes
Radoslaw Wojtak, Ewa L. Lokas, Gary A. Mamon +3
We study the distribution function (DF) of dark matter particles in haloes of mass range 10^{14}--10^{15}\Msun. In the numerical part of this work we measure the DF for a sample of…
Dark Matter Halos: Velocity Anisotropy -- Density Slope Relation
Amir Zait, Yehuda Hoffman, Isaac Shlosman
Dark matter (DM) halos formed in CDM cosmologies seem to be characterized by a power law phase-space density profile. The density of the DM halos is often fitted by the NFW profile…
The Local Hubble Flow: Is it a Manifestation of Dark Energy?
Yehuda Hoffman, Luis A. Martinez-Vaquero, Gustavo Yepes +1
To study the local Hubble flow, we have run constrained dark matter (DM) simulations of the Local Group (LG) in the concordance LCDM and OCDM cosmologies, with identical cosmologic…
Evolution of Phase-Space Density in Dark Matter Halos
Yehuda Hoffman, Emilio Romano-Diaz, Isaac Shlosman +1
The evolution of the phase-space density profile in dark matter (DM) halos is investigated by means of constrained simulations, designed to control the merging history of a given D…
The Future of the Local Large Scale Structure: the roles of Dark Matter and Dark Energy
Yehuda Hoffman, Ofer Lahav, Gustavo Yepes +1
We study the distinct effects of Dark Matter and Dark Energy on the future evolution of nearby large scale structures using constrained N-body simulations. We contrast a model of C…
Constrained simulations of the local universe: I. Mass and motion in the Local Volume
Luis A. Martinez-Vaquero, Gustavo Yepes, Yehuda Hoffman
It has been recently claimed that there is no correlation between the distribution of galaxies and their peculiar velocities within the Local Volume (LV), namely a sphere of R=7/h…
Evolution of Characteristic Quantities for Dark Matter Halo Density Profiles
Emilio Romano-Diaz, Yehuda Hoffman, Clayton Heller +3
We investigate the effect of an assembly history on the evolution of dark matter (DM) halos of 10^{12} Msun/h using Constrained Realizations of random Gaussian fields. Five differe…
Secondary infall and dark matter haloes
Y. Ascasibar, Y. Hoffman, S. Gottloeber
We test the Secondary Infall Model (SIM) by direct comparison with the results of N-body simulations. Eight cluster-size and six galactic-size dark matter haloes have been selected…
Entropy of gas and dark matter in galaxy clusters
A. Faltenbacher, Y. Hoffman, S. Gottloeber +1
On the basis of a large scale 'adiabatic', namely non-radiative and non-dissipative, cosmological smooth particle hydrodynamic simulation we compare the entropy profiles of the gas…
Constrained Simulations of Dark Matter Halos
Yehuda Hoffman, Emilio Romano-Diaz, Aandreas Faltenbacher +3
The formation and structure of dark matter halos is studied by constrained simulations. A series of experiments of the formation of a 10^12 Msun/h halo is designed to study the dep…
Non-parametric reconstruction of the primordial power spectrum at horizon scales from WMAP data
Domenico Tocchini-Valentini, Yehuda Hoffman, Joseph Silk
We extend to large scales a method proposed in previous work that reconstructs non-parametrically the primordial power spectrum from cosmic microwave background data at high resolu…
Cluster mass functions in the quintessential Universe
Ewa L. Lokas, Paul Bode, Yehuda Hoffman
We use -body simulations to measure mass functions in flat cosmological models with quintessence characterized by constant with , -2/3 and -1/2. The results are compar…
Flat-Cored Dark Matter in Cuspy Clusters of Galaxies
Amr El-Zant, Yehuda Hoffman, Joel Primack +2
Sand, Treu, & Ellis (2002) have measured the central density profile of cluster MS2137-23 with gravitational lensing and velocity dispersion and removed the stellar contribution wi…
Simulations of the Local Universe
Stefan Gottloeber, Anatoly Klypin, Andrey Kravtsov +2
The theory of structure formation predicts that galaxies form within extended massive dark matter halos built from smaller pieces that collided and merged, resulting in the hierarc…
Consistent beta values from density-density and velocity-velocity comparisons
Saleem Zaroubi, Enzo Branchini, Yehuda Hoffman +1
We apply a new algorithm, called the Unbiased Minimal Variance (hereafter UMV) estimator, to reconstruct the cosmic density and peculiar velocity fields in our local universe from…
Constrained Simulations of the Real Universe: II. Observational Signatures of Intergalactic Gas in the Local Supercluster Region
Andrey V. Kravtsov, Anatoly A. Klypin, Yehuda Hoffman
We present results of gasdynamics+N-body constrained cosmological simulations of the Local Supercluster region (LSC; about 30/h Mpc around the Virgo cluster), which closely mimic t…
Shaping the central structure in CDM halos
Amr El-Zant, Isaac Shlosman, Yehuda Hoffman
Coupling the dark matter (DM) and baryonic components in galaxies via dynamical friction (by allowing the latter to be clumpy) leads to energy input into the DM. The resulting expa…
Nonlinear evolution of spherical perturbation in a non-flat Universe with cosmological constant
Ewa L. Lokas, Yehuda Hoffman
We generalize the spherical collapse model for the formation of bound objects to apply in a Universe with arbitrary positive cosmological constant. We calculate the critical condit…
Constrained Simulations of the Real Universe: the Local Supercluster
Anatoly Klypin, Yehuda Hoffman, Andrey Kravtsov +1
We present cosmological simulations which closely mimic the real Universe within 100Mpc of the Local Group. The simulations, called Constrained Simulations, reproduce the large-sca…
Testing Tidal-Torque Theory: II. Alignment of Inertia and Shear and the Characteristics of Proto-haloes
Cristiano Porciani, Avishai Dekel, Yehuda Hoffman
We investigate the cross-talk between the two key components of tidal-torque theory, the inertia (I) and shear (T) tensors, using a cosmological N-body simulation with thousands of…