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Gravitational lensing has become one of the most powerful tools available for investigating the 'dark side' of the universe. Cosmological strong gravitational lensing, in particular, probes the properties of the dense cores of dark matter…

Cosmology and Nongalactic Astrophysics · Physics 2016-09-30 Nan Li , Michael D. Gladders , Esteban M. Rangel , Michael K. Florian , Lindsey E. Bleem , Katrin Heitmann , Salman Habib , Patricia Fasel

Starting with the well-known NFW dark matter halo distribution, we construct a simple polytropic model for the intracluster medium which is in good agreement with high resolution numerical hydrodynamical simulations, apply this model to a…

Astrophysics · Physics 2009-11-11 Jeremiah P. Ostriker , Paul Bode , Arif Babul

Modeling large-scale sky survey observations is a key driver for the continuing development of high resolution, large-volume, cosmological simulations. We report the first results from the 'Q Continuum' cosmological N-body simulation run…

Cosmology and Nongalactic Astrophysics · Physics 2015-09-09 Katrin Heitmann , Nicholas Frontiere , Chris Sewell , Salman Habib , Adrian Pope , Hal Finkel , Silvio Rizzi , Joe Insley , Suman Bhattacharya

Cosmological N-body simulations predict that dark matter halos should have a universal shape characterized by a steep, cuspy inner profile. Here we report on a spectroscopic study of six clusters each containing a dominant brightest cluster…

Astrophysics · Physics 2011-05-05 D. J. Sand , T. Treu , G. P. Smith , R. S. Ellis

After two decades of direct dynamical simulation of large-scale structure in the universe, it is safe to say the subject is now mature. Still, there are parts of the problem that are less well developed than others. In general, the…

Astrophysics · Physics 2007-05-23 August E. Evrard

ALICE (A Large Ion Collider Experiment) studies the Quark-Gluon Plasma (QGP): a deconfined state of matter obtained in ultra-relativistic heavy-ion collisions. One of the probes for QGP study are quarkonia and open heavy flavour, of which…

Mass bounds on dark matter (DM) candidates are obtained for particles decoupling in or out of equilibrium with {\bf arbitrary} isotropic and homogeneous distribution functions. A coarse grained Liouville invariant primordial phase space…

Astrophysics · Physics 2008-11-26 D. Boyanovsky , H. J. de Vega , N. Sanchez

Galaxy clusters are a promising probe of late-time structure growth, but constraints on cosmology from cluster abundances are currently limited by systematics in their inferred masses. One unmitigated systematic effect in weak-lensing mass…

Cosmology and Nongalactic Astrophysics · Physics 2022-10-26 Dylan Cromer , Nicholas Battaglia , Hironao Miyatake , Melanie Simet

The MACHO Project is searching for galactic dark matter in the form of massive compact halo objects (Machos). Millions of stars in the Large Magellanic Cloud (LMC), Small Magellanic Cloud (SMC), and Galactic bulge are photometrically…

Recent hydrodynamic cosmological simulations cover volumes up to Gpc^3 and resolve halos across a wide range of masses and environments, from massive galaxy clusters down to normal galaxies, while following a large variety of physical…

Astrophysics of Galaxies · Physics 2017-09-11 Rhea-Silvia Remus , Klaus Dolag , Tadziu L. Hoffmann

We present a new parallel implementation of the PINpointing Orbit Crossing-Collapsed HIerarchical Objects (PINOCCHIO) algorithm, a quick tool, based on Lagrangian Perturbation Theory, for the hierarchical build-up of Dark Matter halos in…

Cosmology and Nongalactic Astrophysics · Physics 2015-06-15 P. Monaco , E. Sefusatti , S. Borgani , M. Crocce , P. Fosalba , R. K. Sheth , T. Theuns

We use a large set N-body/hydrodynamical simulations to study the physical properties of the merging cluster El Gordo. We find that the observed X-ray structures, along with other data, can be matched fairly well by simulations with…

Cosmology and Nongalactic Astrophysics · Physics 2024-02-12 R. Valdarnini

We investigate the evolution of the dark matter density profiles of the most massive galaxy clusters in the Universe. Using a `zoom-in' procedure on a large suite of cosmological simulations of total comoving volume of $3\,(h^{-1}\,\rm…

Cosmology and Nongalactic Astrophysics · Physics 2017-12-06 Amandine M. C. Le Brun , Monique Arnaud , Gabriel W. Pratt , Romain Teyssier

We use a suite of N-body simulations that incorporate massive neutrinos as an extra-set of particles to investigate their effect on the halo mass function. We show that for cosmologies with massive neutrinos the mass function of dark matter…

Cosmology and Nongalactic Astrophysics · Physics 2014-01-09 Matteo Costanzi , Francisco Villaescusa-Navarro , Matteo Viel , Jun-Qing Xia , Stefano Borgani , Emanuele Castorina , Emiliano Sefusatti

We use recently published measurements of the kinematics, surface brightness and stellar mass-to-light ratio of the globular cluster NGC 2419 to examine the possibility that this Galactic halo satellite is embedded in a low-mass dark matter…

Cosmology and Nongalactic Astrophysics · Physics 2015-06-11 Rodrigo Ibata , Carlo Nipoti , Antonio Sollima , Michele Bellazzini , Scott Chapman , Emanuele Dalessandro

We present the largest collisionless $N$-body cosmological simulations in a MOdified Newtonian Dynamics (MOND) cosmology to date. Our 4 simulations cover $\Lambda$CDM as a baseline, a MOND with hot dark matter model known as $\nu$HDM, and 2…

Cosmology and Nongalactic Astrophysics · Physics 2026-03-17 Alfie Russell , Indranil Banik , Oscar Cray , Hongsheng Zhao

For the last 30 years many observational and theoretical evidences have shown that galaxy clusters are not spherical objects, and that their shape is much better described by a triaxial geometry. With the advent of multi-wavelength data of…

Cosmology and Nongalactic Astrophysics · Physics 2015-06-23 Mario Bonamigo , Giulia Despali , Marceau Limousin , Raul Angulo , Carlo Giocoli , Geneviève Soucail

[Abridged] We use mock catalogues based on the GALICS model (Hatton et al. 03) to explore the nature of galaxy clustering observed in the SDSS. We measure low and high order angular clustering statistic from these mock catalogues, after…

We present two large cosmological N-body simulations, called Horizon Run 2 (HR2) and Horizon Run 3 (HR3), made using 6000^3 = 216 billions and 7210^3 = 374 billion particles, spanning a volume of (7.200 Gpc/h)^3 and (10.815 Gpc/h)^3,…

Cosmology and Nongalactic Astrophysics · Physics 2012-01-12 Juhan Kim , Changbom Park , Graziano Rossi , Sang Min Lee , J. Richard Gott