Download or read book Baryonic Processes in the Large Scale Structuring of the Universe written by Jean-Baptiste Durrive and published by Springer. This book was released on 2017-07-20 with total page 192 pages. Available in PDF, EPUB and Kindle. Book excerpt: This thesis addresses two very different but equally important topics in the very broad fields of astrophysics and cosmology: (I) the generation of cosmological magnetic fields and (II) gravitational fragmentation of the Cosmic Web. All mathematical developments are completed by illuminating physical interpretations, and the thesis, which is guided by existing observations, is purely theoretical. In part I, the author further develops a magnetogenesis model proposed in the literature, providing an unprecedented level of physical understanding. He demonstrates that the physics of photoionisation is very likely to have premagnetised, at a relevant level, the entire Universe at the early epoch of the formation of the first luminous sources. In part II, the author adapts the tools of plasma spectral theory to the context of gravitational instability of the baryonic gas within the stratified structures of the Cosmic Web. He skillfully derives the wave equation governing the growth of perturbations and explores various equilibrium configurations, in planar and cylindrical geometries characteristic of cosmic walls and filaments, for isothermal and polytropic conditions, with or without an external gravitational background. Clearly structured and written in pedagogical style, this outstanding thesis puts the results into perspective and highlights the merits and limitations of the various approaches explored.
Download or read book The Impact of Baryons on the Large Scale Structure of the Universe written by Weiguang Cui and published by . This book was released on 2017 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Numerical simulations play an important role in current astronomy researches. Previous dark-matter-only simulations have represented the large-scale structure of the Universe. However, nowadays, hydro-dynamical simulations with baryonic models, which can directly present realistic galaxies, may twist these results from dark-matter-only simulations. In this chapter, we mainly focus on these three statistical methods: power spectrum, two-point correlation function and halo mass function, which are normally used to characterize the large-scale structure of the Universe. We review how these baryon processes influence the cosmology structures from very large scale to quasi-linear and non-linear scales by comparing dark-matter-only simulations with their hydro-dynamical counterparts. At last, we make a brief discussion on the impacts coming from different baryon models and simulation codes.
Download or read book Trends in Modern Cosmology written by Abraao Jesse Capistrano and published by BoD – Books on Demand. This book was released on 2017-06-07 with total page 226 pages. Available in PDF, EPUB and Kindle. Book excerpt: The modern cosmology has been turned into an outstanding field of active research through the years. Today, we have more scientific data in modern cosmology than we could get rid of it, which makes the present days an exciting era for scientific knowledge. "Trends in Modern Cosmology" invites the reader to tackle the big questions of the universe from cultural aspects of cosmology and its influence on arts, philosophy, and politics to more specialized technical advances in the field as the physics of dark sector, black holes, galaxies, large structure formation, and particles. In fact, it reveals our endless searching for the better understanding of the universe as a legacy of knowledge for next generations.
Download or read book Development of Large Scale Structure in the Universe written by J. P. Ostriker and published by Cambridge University Press. This book was released on 1991 with total page 90 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book considers modern and fascinating theories of the large scale models of the universe.
Download or read book The Large Scale Structure of the Universe written by P. J. E. Peebles and published by Princeton University Press. This book was released on 2020-09-15 with total page 448 pages. Available in PDF, EPUB and Kindle. Book excerpt: The classic account of the structure and evolution of the early universe from Nobel Prize–winning physicist P. J. E. Peebles An instant landmark on its publication, The Large-Scale Structure of the Universe remains the essential introduction to this vital area of research. Written by one of the world's most esteemed theoretical cosmologists, it provides an invaluable historical introduction to the subject, and an enduring overview of key methods, statistical measures, and techniques for dealing with cosmic evolution. With characteristic clarity and insight, P. J. E. Peebles focuses on the largest known structures—galaxy clusters—weighing the empirical evidence of the nature of clustering and the theories of how it evolves in an expanding universe. A must-have reference for students and researchers alike, this edition of The Large-Scale Structure of the Universe introduces a new generation of readers to a classic text in modern cosmology.
Download or read book Large Scale Structure In The Universe Proceedings Of The International Workshop written by Jan P Mucket and published by World Scientific. This book was released on 1995-10-31 with total page 394 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume documents the theoretical and observational results and arguments in favour of (or against) the most preferred models of structure formation. New observational results of the large scale distribution of matter are confronted with recent theories on the origin and evolution of structure in the universe.
Download or read book Structure Formation in the Universe written by Robert G. Crittenden and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 380 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book contains a series of lectures given at the NATO Advanced Study Institute (ASI) "Structure Formation in the Universe", held at the Isaac Newton Institute in Cambridge in August, 1999. The ASI was held at a critical juncture in the development of physical cosmology, when a flood of new data concerning the large scale structure of the Universe was just be coming available. There was an air of excitement and anticipation: would the standard theories fit the data, or would new ideas and models be re quired? Cosmology has long been a field of common interest between East and West, with many seminal contributions made by scientists working in the former Soviet Union and Eastern bloc. A major aim of the ASI was to bring together scientists from across the world to discuss exciting recent developments and strengthen links. However, a few months before the meeting it appeared that it might have to be cancelled. The war in the former Yugoslavia escalated and NATO began a protracted bombing cam paign against targets in Kosovo and Serbia. Many scientists felt uneasy about participating in a NATO-funded meeting in this situation. After a great deal of discussion, it was agreed that the developing East West conflict only heightened the need for further communication and that the school should go ahead as planned, but with a special session devoted to discussion of the legitimacy of NATO's actions.
Download or read book The Structure and Environment of Galaxy Clusters in Simulations and Observations written by Matthew Fong and published by . This book was released on 2019 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Galaxy clusters are powerful testing grounds for cosmology. They are the largest, most massively bound objects in the Universe and can give us deep insights on how baryons, dark matter, and dark energy impacts on the formation of large scale structure in the cosmos. In this dissertation we study the structure and environment of clusters, how neutrinos impact on cluster masses, and how we may find them. We study cluster profiles on large scales to gain better understanding on the relationship between cosmic web filaments and clusters that reside in the nodes, which gives insight on the evolution of clusters from their environment. For more than two decades, the Navarro, Frenk, and White (NFW) model has stood the test of time; it is used to describe the distribution of mass in galaxy clusters out to their outskirts, beyond which the NFW model is no longer applicable. In this dissertation we assess how well the parameterised Diemer & Kravstov (DK) mass density profile describes the mass distribution of galaxy clusters extracted from cosmological simulations. This is determined from averaged synthetic lensing measurements of the 50 most massive clusters extracted from the OverWhelmingly Large Simulations (Cosmo-OWLS). The characteristics of the data reflect the Weighing the Giants survey and data from the future Large Synoptic Survey Telescope (LSST). In comparison with the NFW model, the DK model is favored by the averaged data, in particular for the LSST data, where the number density of background galaxies is higher. The DK profile depends on the accretion history of clusters which is specified in the current study. Eventually subsamples of galaxy clusters with qualities indicative of disparate accretion histories could be studied. We also study the impact of baryonic processes and massive neutrinos on weak lensing (WL) peak statistics that can be used to constrain cosmological parameters. We use the BAHAMAS suite of cosmological simulations, which self-consistently include baryonic processes and the e↵ect of massive neutrino free-streaming on the evolution of structure formation. We construct synthetic WL catalogues by ray-tracing through light-cones, and use the aperture mass statistic for the analysis. The WL peaks reflect the cumulative signal from massive bound objects and general large-scale structure. We present the first study of WL peaks in simulations that include both baryonic physics and massive neutrinos, so that the uncertainty due to physics beyond the gravity of dark matter can be factored into constraints on cosmological models. Assuming a fiducial model of baryonic physics, we also investigate the correlation between peaks and massive haloes, over a range of neutrino masses. As higher neutrino mass tends to suppress the formation of massive structures in the Universe, the halo mass function and lensing peak counts are therefore modified as a function of neutrino mass. Over most of the S/N .5, the impact of fiducial baryonic physics is greater (less) than neutrinos for 0.06 and 0.12 (0.24 and 0.48) eV models. Both baryonic physics and massive neutrinos should be accounted for when deriving cosmological parameters from weak lensing observations.
Download or read book Large Scale Structures in the Universe Observational and Analytical Methods written by Waltraud C. Seitter and published by Springer. This book was released on 1988-08-30 with total page 348 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book will certainly be considered an important reference for astronomers and astrophysicists handling large amounts of data in observational and theoretical approaches to the large scale structures in the universe. The contributions are written with an emphasis on methods. The volume contains among many other topics recent observational results on redshift surveys of clusters and distributions of galaxies and quasars, together with articles on the importance of these findings for future standards and for theoretical predictions. A long historical chapter serves as an introduction. This mixture of textbook and review is aimed at the newcomer to the field as well as at the specialist. Graduate students will find it useful for additional reading.
Download or read book Large Scale Structures of the Universe written by International Astronomical Union. Symposium and published by Springer Science & Business Media. This book was released on 1988-07-31 with total page 662 pages. Available in PDF, EPUB and Kindle. Book excerpt: Proceedings of the 130th Symposium of the International Astronomical Union, dedicated to the memory of Marc A. Aaronson (1950-1987), held in Balatonfured, Hungary, June 15-20, 1987
Download or read book Large Scale Structure Formation written by Reza Mansouri and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 385 pages. Available in PDF, EPUB and Kindle. Book excerpt: The modern Persian word for cosmology is "Keyhan-shenakht", which is also the title of a Persian book written more than 800 years ago. The same term can also be found in Old Persian. In spite of this old tradition, modern cosmology is a new~omer within the scientific disciplines in Iran. The cosmology community' is small and not yet well established. Given the spectacular recent advances in observational and theoretical cosmology, the large amount of new observational data which will become available in the near future, and the rapid expansion of the international cosmology community, it was realized that Iran should play a more active role in the exciting human endeavour which cosmology constitutes. This was the main motivation to establish a School on Cosmology in Iran. The plan is to hold a cosmology school every three years somewhere in Iran. The focus of this First School on Cosmology was chosen to be structure formation, a rapidly evolving cornerstone of modern cosmology. The topics of the school were selected in order to give both a broad overview of the current status of cosmological structure formation, and an in-depth dis cussion of the key issues theory of cosmological perturbations and analysis of cosmic microwave anisotropies. The lectures by Blanchard and Sarkar give an overview of homogeneous cosmological models and standard big bang cosmology. In his contribution, Padmanabhan presents a comprehen sive discussion of the growth of cosmological perturbations.
Download or read book Phase Transitions in the Early Universe Theory and Observations written by Héctor J. De Vega and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 589 pages. Available in PDF, EPUB and Kindle. Book excerpt: A fundamental, profound review of the key issues relating to the early universe and the physical processes that occurred in it. The interplay between cosmic microwave background radiation, large scale structure, and the dark matter problem are stressed, with a central focus on the crucial issue of the phase transitions in the early universe and their observable consequences: baryon symmetry, baryogenesis and cosmological fluctuations. There is an interplay between cosmology, statistical physics and particle physics in studying these problems, both at the theoretical and the experimental / observational levels. Special contributions are devoted to primordial and astrophysical black holes and to high energy cosmic rays and neutrino astrophysics. There is also a special section devoted to the International Space Station and its scientific utilization.
Download or read book The Large scale Structure of the Universe written by Yookyung Noh and published by . This book was released on 2013 with total page 127 pages. Available in PDF, EPUB and Kindle. Book excerpt: The usefulness of large-scale structure as a probe of cosmology and structure formation is increasing as large deep surveys in multi-wavelength bands are becoming possible. The observational analysis of large-scale structure guided by large volume numerical simulations are beginning to offer us complementary information and crosschecks of cosmological parameters estimated from the anisotropies in Cosmic Microwave Background (CMB) radiation. Understanding structure formation and evolution and even galaxy formation history is also being aided by observations of different redshift snapshots of the Universe, using various tracers of large-scale structure. This dissertation work covers aspects of large-scale structure from the baryon acoustic oscillation scale, to that of large scale filaments and galaxy clusters. First, I discuss a large- scale structure use for high precision cosmology. I investigate the reconstruction of Baryon Acoustic Oscillation (BAO) peak within the context of Lagrangian perturbation theory, testing its validity in a large suite of cosmological volume N-body simulations. Then I consider galaxy clusters and the large scale filaments surrounding them in a high resolution N-body simulation. I investigate the geometrical properties of galaxy cluster neighborhoods, focusing on the filaments connected to clusters. Using mock observations of galaxy clusters, I explore the the correlations of scatter in galaxy cluster mass estimates from multi-wavelength observations and different measurement techniques. I also examine the sources of the correlated scatter by considering the intrinsic and environmental properties of clusters.
Download or read book Structure Formation in the Universe written by T. Padmanabhan and published by Cambridge University Press. This book was released on 1993 with total page 504 pages. Available in PDF, EPUB and Kindle. Book excerpt: This text provides an up-to-date and pedagogical introduction to this exciting area of research.
Download or read book Cosmological Inflation and Large Scale Structure written by Andrew R. Liddle and published by Cambridge University Press. This book was released on 2000-04-13 with total page 420 pages. Available in PDF, EPUB and Kindle. Book excerpt: A thorough and up-to-date graduate textbook on the most promising theory of the universe - inflationary cosmology.
Download or read book Structures in the Universe by Exact Methods written by Krzysztof Bolejko and published by Cambridge University Press. This book was released on 2010 with total page 257 pages. Available in PDF, EPUB and Kindle. Book excerpt: Reviews developments in applications of inhomogeneous models to cosmology, for graduate students and academic researchers in astrophysics.
Download or read book Dark Energy and the Formation of the Large Scale Structure of the Universe written by Jérôme Gleyzes and published by Springer. This book was released on 2016-06-28 with total page 124 pages. Available in PDF, EPUB and Kindle. Book excerpt: This thesis presents several significant new results that shed light on two major puzzles of modern cosmology: the nature of inflation, the very early phase of the universe that is thought to have given rise to the large-scale structures that we observe today; and that of the current accelerated expansion. In particular, it develops a clean method for characterizing linear cosmological perturbations for general theories where gravity is modified and/or affected by a new component, called dark energy, responsible for the accelerated expansion. It proposes a new extension to what were long thought to be the most general scalar field theories devoid of instabilities, and demonstrates the robustness of the relation between the energy scale of inflation and the predicted amplitude of gravitational waves. Finally, it consolidates a set of consistency relations between correlation functions of the cosmological density field and investigates the phenomenological consequences of their potential violation. Presented in a clear, succinct and rigorous style, each of these original results is both profound and important and will leave a deep mark on the field.
