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Both the gas flaring and the dip in the rotation curve, which was recently reconfirmed with precise measurements using the VERA VLBI array in Japan, suggest doughnut-like substructure in the dark matter (DM) halo. A global fit to all…

宇宙学与河外天体物理 · 物理学 2015-05-20 W. de Boer , M. Weber

The Cold Dark Matter theory of gravitationally-driven hierarchical structure formation has earned its status as a paradigm by explaining the distribution of matter over large spans of cosmic distance and time. However, its central tenet,…

Dark matter represents currently an outstanding problem in both cosmology and particle physics. In this review we discuss the possible explanations for dark matter and the experimental observables which can eventually lead to the discovery…

高能物理 - 唯象学 · 物理学 2021-04-26 A. Arbey , F. Mahmoudi

I provide a short review of the current status of indirect dark matter searches with gamma rays, charged cosmic rays and neutrinos. For each case I will focus on various excesses reported in the literature which have been interpreted as…

高能天体物理现象 · 物理学 2020-05-20 Alessandro Cuoco

We describe how a certain simple modification of general relativity, in which the local cosmological constant is allowed to depend on the space-time curvature, predicts the existence of halos of modified gravity surrounding…

广义相对论与量子宇宙学 · 物理学 2009-03-20 Kirill Krasnov , Yuri Shtanov

Models of structure formation based on cold dark matter predict that most of the small dark matter haloes that first formed at high redshift would have merged into larger systems by the present epoch. Substructure in present-day haloes…

天体物理学 · 物理学 2007-05-23 James E. Taylor , Joseph Silk , Arif Babul

The clustering of matter on cosmological scales is an essential probe for studying the physical origin and composition of our Universe. To date, most of the direct studies have focused on shear-shear weak lensing correlations, but it is…

宇宙学与河外天体物理 · 物理学 2010-07-26 Tobias Baldauf , Robert E. Smith , Uros Seljak , Rachel Mandelbaum

The aim of this paper is to present the case that stellar mass primordial black holes make up the dark matter component of the Universe. A near critical density of compact bodies implies that most lines of sight will be gravitationally…

宇宙学与河外天体物理 · 物理学 2011-06-21 M. R. S. Hawkins

I show that the predicted densities of the inner dark matter halos in LCDM models of structure formation appear to be higher than estimates from real galaxies and constraints from dynamical friction on bars. This inconsistency would not be…

天体物理学 · 物理学 2015-05-13 J. A. Sellwood

Gates et al (astro-ph/9606132) have raised several issues in their Comment on our Letter (Phys. Rev. Lett. Vol. 76, p.3886 (1996); astro-ph/9605001). We clarify these issues and show that our results are robust, and there is no…

天体物理学 · 物理学 2007-05-23 R. Cowsik , Charu Ratnam , P. Bhattacharjee

The uncertainties in photometric redshifts and stellar masses from imaging surveys affect galaxy sample selection, their abundance measurements, as well as the measured weak lensing signals. We develop a framework to assess the systematic…

星系天体物理 · 物理学 2024-08-12 Navin Chaurasiya , Surhud More , Daichi Kashino , Shogo Masaki , Shogo Ishikawa

The theoretical interpretation of dark matter (DM) experiments is hindered by uncertainties on the dark matter density and velocity distribution inside the Solar System. In order to quantify those uncertainties, we present a parameter that…

高能物理 - 唯象学 · 物理学 2018-12-14 Alejandro Ibarra , Bradley J. Kavanagh , Andreas Rappelt

We establish new dynamical constraints on the mass and abundance of compact objects in the halo of dwarf spheroidal galaxies. In order to preserve kinematically cold the second peak of the Ursa Minor dwarf spheroidal (UMi dSph) against…

天体物理学 · 物理学 2009-11-13 F. J. Sanchez-Salcedo , V. Lora

For nearly a century, more mass has been measured in galaxies than is contained in the luminous stars and gas. Through continual advances in observations and theory, it has become clear that the dark matter in galaxies is not comprised of…

宇宙学与河外天体物理 · 物理学 2015-06-12 Louis E. Strigari

Cosmological structure formation predicts that our galactic halo contains an enormous hierarchy of substructures and streams, the remnants of the merging hierarchy that began with tiny Earth mass microhalos. If these structures persist…

星系天体物理 · 物理学 2015-03-19 Aurel Schneider , Lawrence M. Krauss , Ben Moore

We investigate the complex interactions between the stellar disc and the dark-matter halo during bar formation and evolution using N-body simulations with fine temporal resolution and optimally chosen spatial resolution. We find that the…

星系天体物理 · 物理学 2016-10-17 Michael S. Petersen , Martin D. Weinberg , Neal Katz

A sample of 11 thousand galaxies with radial velocities V_ LG < 3500 km/s is used to study the features of the local distribution of luminous (stellar) and dark matter within a sphere of radius of around 50 Mpc around us. The average…

宇宙学与河外天体物理 · 物理学 2015-06-04 I. D. Karachentsev

We infer the connection between the stellar mass of galaxies from the Subaru Hyper Suprime-Cam (HSC) survey, and their dark matter halo masses and its evolution in two bins of redshifts between $[0.3, 0.8]$. We use the measurements of the…

星系天体物理 · 物理学 2023-07-11 Navin Chaurasiya , Surhud More , Shogo Ishikawa , Shogo Masaki , Daichi Kashino , Teppei Okumura

We discuss the motivation for high accuracy relativistic gravitational experiments in the Solar System and complementary cosmological tests. We focus our attention on the issue of distinguishing a generic scalar-theory of gravity as the…

天体物理学 · 物理学 2008-11-26 Orfeu Bertolami

According to the now strongly supported concordance $\Lambda$CDM model, galaxies may be grossly described as a luminous component embedded in a dark matter halo. The density profile of these mass dominating haloes may be determined by N -…

宇宙学与河外天体物理 · 物理学 2014-02-04 A. Del Popolo , V. F. Cardone