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The Secondary Infall Model Of Galactic Halo Formation And The Spectrum Of Cold Dark Matter Particles On Earth
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Book Synopsis The Secondary Infall Model of Galactic Halo Formation and the Spectrum of Cold Dark Matter Particles on Earth by :
Download or read book The Secondary Infall Model of Galactic Halo Formation and the Spectrum of Cold Dark Matter Particles on Earth written by and published by . This book was released on 1996 with total page 39 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis What is the Spectrum of Cold Dark Matter Particles on Earth?. by :
Download or read book What is the Spectrum of Cold Dark Matter Particles on Earth?. written by and published by . This book was released on 1996 with total page 8 pages. Available in PDF, EPUB and Kindle. Book excerpt: It is argued that the spectrum of cold dark matter particles on Earth has peaks in velocity space associated with particles falling onto the Galaxy for the first time and with particles which have fallen in and out of the Galaxy only a small number of times in the past. Estimates are given for the sizes and velocity magnitudes of the first few peaks. The estimates are based on the secondary infall model of halo formation which has been generalized to include the effect of angular momentum.
Book Synopsis Das Träumchen, meiner Henriette zum Weihnachtsgeschenk by :
Download or read book Das Träumchen, meiner Henriette zum Weihnachtsgeschenk written by and published by . This book was released on 1860 with total page 4 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Identification Of Dark Matter, The - Proceedings Of The Second International Workshop by : Neil J C Spooner
Download or read book Identification Of Dark Matter, The - Proceedings Of The Second International Workshop written by Neil J C Spooner and published by World Scientific. This book was released on 1999-08-13 with total page 710 pages. Available in PDF, EPUB and Kindle. Book excerpt: There is general agreement among astrophysicists that most of the matter in the universe is dark, but a wide divergence of views about what this dark matter is. This volume addresses the problem of detecting and identifying dark matter candidates from axions to black holes. Although theoretical issues are considered, the focus of the book is on observational and experimental techniques, current results and future prospects.
Book Synopsis Dark Matter In Astro- And Particle Physics, Dark '96 by : Hans Volker Klapdor-kleingrothaus
Download or read book Dark Matter In Astro- And Particle Physics, Dark '96 written by Hans Volker Klapdor-kleingrothaus and published by World Scientific. This book was released on 1997-10-13 with total page 758 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume contains the talks presented at the International Workshop on Aspects of Dark Matter in Astro- and Particle Physics (DARK '96). It provides a thorough presentation and discussion of the topic of dark matter, which currently seems to be one of the most exciting problems of modern physics, in the perspectives of different disciplines like astronomy, astrophysics, cosmology and particle physics.The lectures and talks range from astronomical evidence in galaxies and galaxy clusters, recent information provided by X rays (ROSAT satellite) and by observation of MACHOs, to early universe and particle physics solutions to the dark matter problem, including simultaneous solutions to the problems of baryogenesis and dark matter. Beyond the favoured supersymmetric candidates, the more exotic dark matter proposals are also discussed. The experimental section examines the most recent efforts in direct and indirect experiments, including new techniques like cryogenic detectors and superheated droplet detectors, as well as efforts with large scale underground detectors like MACRO, Baksan, Baikal and AMANDA. Also, the potential of present and future (LHC) high energy accelerators is thoroughly discussed. A section on hot dark matter gives the current status of experiments searching for a neutrino mass, like double beta decay and neutrino oscillation experiments, including intermediate scale long baseline experiments.
Book Synopsis Phase-space Structure of Cold Dark Matter Halos by :
Download or read book Phase-space Structure of Cold Dark Matter Halos written by and published by . This book was released on 1991 with total page 12 pages. Available in PDF, EPUB and Kindle. Book excerpt: A galactic halo of cold dark matter particles has a sheet-like structure in phase-space. The energy and momentum spectra of such particles on earth has a set of peaks whose central values and intensities form a record of the formation of the Galaxy. Scattering of the dark matter particles by stars and globular clusters broadens the peaks but does not erase them entirely. The giant shells around some elliptical galaxies may be a manifestation of this structure.
Book Synopsis Dark Matter in the Universe by : David Cline
Download or read book Dark Matter in the Universe written by David Cline and published by . This book was released on 1996 with total page 358 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis The Onset of Nonlinearity in Cosmology by : James N. Fry
Download or read book The Onset of Nonlinearity in Cosmology written by James N. Fry and published by . This book was released on 2001 with total page 176 pages. Available in PDF, EPUB and Kindle. Book excerpt: "Comprises the proceedings of a conference entitled the 15th Florida Workshop in Nonlinear Astronomy and Physics: the Onset of Nonlinearity in Cosmology, held during February 17-19, 2000, in Gainesville, Florida"--Page [v].
Book Synopsis The Role of Halo Substructure in Gamma-Ray Dark Matter Searches by : Miguel A. Sánchez-Conde
Download or read book The Role of Halo Substructure in Gamma-Ray Dark Matter Searches written by Miguel A. Sánchez-Conde and published by MDPI. This book was released on 2020-05-28 with total page 220 pages. Available in PDF, EPUB and Kindle. Book excerpt: An important, open research topic today is to understand the relevance that dark matter halo substructure may have for dark matter searches. In the standard cosmological model, halo substructure or subhalos are predicted to be largely abundant inside larger halos, for example, galaxies such as ours, and are thought to form first and later merge to form larger structures. Dwarf satellite galaxies—the most massive exponents of halo substructure in our own galaxy—are already known to be excellent targets for dark matter searches, and indeed, they are constantly scrutinized by current gamma-ray experiments in the search for dark matter signals. Lighter subhalos not massive enough to have a visible counterpart of stars and gas may be good targets as well, given their typical abundances and distances. In addition, the clumpy distribution of subhalos residing in larger halos may boost the dark matter signals considerably. In an era in which gamma-ray experiments possess, for the first time, the exciting potential to put to test the preferred dark matter particle theories, a profound knowledge of dark matter astrophysical targets and scenarios is mandatory should we aim for accurate predictions of dark matter-induced fluxes for investing significant telescope observing time on selected targets and for deriving robust conclusions from our dark matter search efforts. In this regard, a precise characterization of the statistical and structural properties of subhalos becomes critical. In this Special Issue, we aim to summarize where we stand today on our knowledge of the different aspects of the dark matter halo substructure; to identify what are the remaining big questions, and how we could address these; and, by doing so, to find new avenues for research.
Author :Colloquium on the Age of the Universe St Publisher :National Academies Press ISBN 13 :9780309060264 Total Pages :100 pages Book Rating :4.0/5 (62 download)
Book Synopsis Colloquium on the Age of the Universe, Dark Matter, and Structure Formation by : Colloquium on the Age of the Universe St
Download or read book Colloquium on the Age of the Universe, Dark Matter, and Structure Formation written by Colloquium on the Age of the Universe St and published by National Academies Press. This book was released on 1998-01-01 with total page 100 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Referativnyĭ zhurnal written by and published by . This book was released on 1998 with total page 604 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Galactic Stellar Haloes in the CDM Model by : Andrew Paul Cooper
Download or read book Galactic Stellar Haloes in the CDM Model written by Andrew Paul Cooper and published by . This book was released on 2010 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: This thesis studies galactic stellar haloes built up through the tidal disruption of accreted dwarf galaxies. Numerical simulations are used to explore this process in the context of the Cold Dark Matter model of cosmological structure formation. We predict the properties of stellar structures that the next generation of surveys may discover in the Milky Way halo and the haloes of other nearby galaxies. We present six simulations based on the Aquarius project, a suite of high resolution N-body simulations of individual dark matter haloes in a fully cosmological setting. We tag subsets of particles in these simulations with stellar populations predicted by the GALFORM semi-analytic model of galaxy formation. Our method self-consistently tracks the dynamical evolution and disruption of satellites from high redshift. The luminosity function and structural properties of surviving satellites, which agree well with observations, suggest that this technique is appropriate. We find that accreted stellar haloes are assembled between redshifts 1 and 7 from less than 5 significant progenitors. These progenitors are old, metal-rich satellites with stellar masses similar to the brightest Milky Way dwarf spheroidals (100-100 million Solar masses). In contrast to previous stellar halo simulations, we find that several of these major contributors survive as self-bound systems to the present day. Both the number of these significant progenitors and their infall times are inherently stochastic. This results in great diversity among our stellar haloes, which amplifies small differences between the formation histories of their dark halo hosts. The masses (0.1-1 billion Solar masses) and density/surface-brightness profiles of the stellar haloes (from 10 to 100 kpc) are consistent with expectations from the Milky Way and M31. Each halo has a complex structure, consisting of well-mixed components, tidal streams, shells and other subcomponents. This structure is not adequately described by smooth models. The central regions (within 10 kpc) of our haloes are highly prolate (c/a approx. 0.3), although we find one example of a massive accreted thick disc. Metallicity gradients in our haloes are typically significant only where the halo is built from a small number of satellites. We contrast the ages and metallicities of halo stars with surviving satellites, finding broad agreement with recent observations. We examine these simulations from the perspective of an observer located at the position of the Sun. We discuss the apparent smoothness of the halo relative to simple 3D star counts derived from photometric tomography. We then describe a simple correlation function statistic that quantifies the amount of spatial and kinematic substructure in the distant stellar halo. We test this statistic with the simulations we have developed, and find that it can distinguish between a range of realistic alternatives for the global structure of the stellar halo. We show that current observational data from pencil beam surveys of approximately 100 tracer stars (such as the Spaghetti Survey) are not sufficient to constrain the degree of structure in the Milky Way halo with this statistic. Larger area surveys with more than 1000 tracer stars (such BHB stars in the Sloan Digital Sky Survey) provide much tighter constraints on comparisons between CDM models and the Milky Way. Finally, we explore the kinematic structure of accreted stellar haloes in the CDM model. We demonstrate that multicomponent haloes like those of the Milky Way and M31 arise naturally through the accretion of stars from tidally disrupted satellite galaxies. Accreted haloes can reproduce the gross properties of the velocity ellipsoid measured in the Solar neighbourhood, although they can be far from dynamical equilibrium and have complex anisotropy profiles. In particular, halo stars do not trace the dark matter velocity distribution up to the escape velocity in the Solar neighbourhood. This suggests that mass estimates of the Milky Way based on related kinematic measurements may deviate significantly from the true mass, if the stellar halo is built largely though accretion.
Book Synopsis The Effects of Inelastic Self-interacting Dark Matter on Galactic Halo Properties V by : Karia Radh Dibert
Download or read book The Effects of Inelastic Self-interacting Dark Matter on Galactic Halo Properties V written by Karia Radh Dibert and published by . This book was released on 2018 with total page 40 pages. Available in PDF, EPUB and Kindle. Book excerpt: Self-interacting dark matter, which serves as an alternative to collisionless cold dark matter, may be useful for solving the small-scale galaxy formation problems present in the Lambda-Cold Dark Matter model. So far, most self-interacting dark matter simulations have considered only elastic collisions between particles. Using the results of a numerical implementation in the AREPO code, the effects of two-state inelastic dark matter on the density profiles, velocity dispersions, pseudo-phase-space density profiles, orbital anisotropy parameter profiles, and principal axis ratios of galactic halos are examined. We find that inelastic self-interacting dark matter halos differ from both cold dark matter halos and elastic self-interacting dark matter halos in density profiles, in velocity dispersion profiles, in pseudo-phase-space density profiles, and in orbital anisotropy parameter profiles, while the shapes of the halos generated by elastic and inelastic self-interacting dark matter models are relatively similar.
Book Synopsis Dark Side Of The Universe, The: Experimental Efforts And Theoretical Framework - Proceedings Of International Workshop by : Rita Bernabei
Download or read book Dark Side Of The Universe, The: Experimental Efforts And Theoretical Framework - Proceedings Of International Workshop written by Rita Bernabei and published by World Scientific. This book was released on 1994-06-22 with total page 318 pages. Available in PDF, EPUB and Kindle. Book excerpt: Most of the relevant topics on the dark matter in the universe are discussed. The present knowledge of the problem is presented and possible solutions are discussed. The actual experimental efforts devoted to determining the nature of the dark matter — baryonic (for instance, brown dwarfs) or non-baryonic (such as supersymmetric particles) — and to detecting it are illustrated, paying particular attention to necessary technological developments.
Book Synopsis Trends in Astroparticle Physics by : Lars Bergström
Download or read book Trends in Astroparticle Physics written by Lars Bergström and published by . This book was released on 1995 with total page 380 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Modern Cosmology by : Scott Dodelson
Download or read book Modern Cosmology written by Scott Dodelson and published by Academic Press. This book was released on 2003-03-13 with total page 462 pages. Available in PDF, EPUB and Kindle. Book excerpt: An advanced text for senior undergraduates, graduate students and physical scientists in fields outside cosmology. This is a self-contained book focusing on the linear theory of the evolution of density perturbations in the universe, and the anisotropiesin the cosmic microwave background.
Book Synopsis Galaxy Formation and Evolution by : Houjun Mo
Download or read book Galaxy Formation and Evolution written by Houjun Mo and published by Cambridge University Press. This book was released on 2010-05-20 with total page 841 pages. Available in PDF, EPUB and Kindle. Book excerpt: A coherent introduction for researchers in astronomy, particle physics, and cosmology on the formation and evolution of galaxies.