The Primordial Curvature Perturbation In The Universe
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| Author | : David H. Lyth |
| Publisher | : Cambridge University Press |
| Total Pages | : 516 |
| Release | : 2009-06-11 |
| Genre | : Science |
| ISBN | : 1139643746 |
The origin and evolution of the primordial perturbation is the key to understanding structure formation in the earliest stages of the Universe. It carries clues to the types of physical phenomena active in that extreme high-density environment. Through its evolution, generating first the observed cosmic microwave background anisotropies and later the distribution of galaxies and dark matter in the Universe, it probes the properties and dynamics of the present Universe. This graduate-level textbook gives a thorough account of theoretical cosmology and perturbations in the early Universe, describing their observational consequences and showing how to relate such observations to primordial physical processes, particularly cosmological inflation. With ambitious observational programmes complementing ever-increasing sophistication in theoretical modelling, cosmological studies will remain at the cutting edge of astrophysical studies for the foreseeable future.
| Author | : Mindaugas Karciauskas |
| Publisher | : LAP Lambert Academic Publishing |
| Total Pages | : 236 |
| Release | : 2010-10 |
| Genre | : |
| ISBN | : 9783838369815 |
The study of the primordial curvature perturbation gives us insights into the origin and structure of the Universe and the laws of physics which operate at energies much higher than achievable in experiments. In this work the author briefly reviews the Hot Big Bang theory of the Universe and cosmological inflation. He describes how quantum fluctuations of light scalar fields during inflation are converted into the classical perturbation which can seed the growth of galaxies and galaxy clusters. In the second half of the book the author demonstrates that quantum fluctuations of vector fields can be responsible for the total or part of the primordial curvature perturbation too. In general this perturbation has a distinct observational signature - statistically anisotropic temperature irregularities in the Cosmic Microwave Background, which could be measured by the Planck satellite in the very near future. These ideas are explored using several mechanisms to break the conformal invariance of the vector field and generate the curvature perturbation. The book should be useful for students studying cosmology and researchers in the area of cosmological perturbations.
| Author | : Mindaugas Karciauskas |
| Publisher | : |
| Total Pages | : |
| Release | : 2009 |
| Genre | : |
| ISBN | : |
| Author | : Patrick Peter |
| Publisher | : Oxford University Press |
| Total Pages | : 858 |
| Release | : 2013-02-14 |
| Genre | : Science |
| ISBN | : 019966515X |
This book provides an extensive survey of all the physics necessary to understand the current developments in the field of fundamental cosmology, as well as an overview of the observational data and methods. It will help students to get into research by providing definitions and main techniques and ideas discussed today. The book is divided into three parts. Part 1 summarises the fundamentals in theoretical physics needed in cosmology (general relativity, field theory, particle physics). Part 2 describes the standard model of cosmology and includes cosmological solutions of Einstein equations, the hot big bang model, cosmological perturbation theory, cosmic microwave background anisotropies, lensing and evidence for dark matter, and inflation. Part 3 describes extensions of this model and opens up current research in the field: scalar-tensor theories, supersymmetry, the cosmological constant problem and acceleration of the universe, topology of the universe, grand unification and baryogenesis, topological defects and phase transitions, string inspired cosmology including branes and the latest developments. The book provides details of all derivations and leads the student up to the level of research articles.
| Author | : Ignacio Zaballa |
| Publisher | : |
| Total Pages | : 0 |
| Release | : 2006 |
| Genre | : |
| ISBN | : |
| Author | : Ali Akbar Abolhasani |
| Publisher | : World Scientific |
| Total Pages | : 182 |
| Release | : 2019-01-30 |
| Genre | : Science |
| ISBN | : 9813238771 |
Early Universe cosmology is an active area of research and cosmic inflation is a pillar of modern cosmology. Among predictions of inflation, observationally the most important one is the generation of cosmological perturbations from quantum vacuum fluctuations that source all inhomogeneous structures in the Universe, not to mention the large-scale structures such as clusters of galaxies.Cosmological perturbation theory is the basic tool to study the perturbations generated from inflation. There are a few different approaches to primordial cosmological perturbations. In the conventional approach one perturbs the field equations and after quantizing the perturbations by the use of the corresponding action, one calculates the power spectrum of cosmological observables. This approach extends to higher order perturbations such as bispectrum etc., but the analysis becomes increasingly difficult.The delta N formalism, the topic of this book, is an alternative approach. The novelty of this approach is that, under the condition that the scale of interest is very large so that the spatial derivatives may be ignored in the dynamics, it can be applied to all orders in perturbation theory and has a rigorous foundation in general relativity. Thanks to the fact that one can evaluate perturbations with only the knowledge of background solutions, it is proved to be much easier than the conventional approach in evaluating higher order effects in many cases.
| Author | : Will Kinney |
| Publisher | : MIT Press |
| Total Pages | : 251 |
| Release | : 2022-04-05 |
| Genre | : Science |
| ISBN | : 0262368439 |
What happened before the primordial fire of the Big Bang: a theory about the ultimate origin of the universe. In the beginning was the Big Bang: an unimaginably hot fire almost fourteen billion years ago in which the first elements were forged. The physical theory of the hot nascent universe—the Big Bang—was one of the most consequential developments in twentieth-century science. And yet it leaves many questions unanswered: Why is the universe so big? Why is it so old? What is the origin of structure in the cosmos? In An Infinity of Worlds, physicist Will Kinney explains a more recent theory that may hold the answers to these questions and even explain the ultimate origins of the universe: cosmic inflation, before the primordial fire of the Big Bang. Kinney argues that cosmic inflation is a transformational idea in cosmology, changing our picture of the basic structure of the cosmos and raising unavoidable questions about what we mean by a scientific theory. He explains that inflation is a remarkable unification of inner space and outer space, in which the physics of the very large (the cosmos) meets the physics of the very small (elementary particles and fields), closing in a full circle at the first moment of time. With quantum uncertainty its fundamental feature, this new picture of cosmic origins introduces the possibility that the origin of the universe was of a quantum nature. Kinney considers the consequences of eternal cosmic inflation. Can we come to terms with the possibility that our entire observable universe is one of infinitely many, forever hidden from our view?
| Author | : Alexander A. Friedmann |
| Publisher | : Minkowski Institute Press |
| Total Pages | : 73 |
| Release | : 2014-01-30 |
| Genre | : Science |
| ISBN | : 1927763223 |
If the talented Russian physicist Alexander Alexandrovich Friedmann had to be introduced with a single sentence, the most appropriate sentence would be the title of his biography translated from the Russian: Alexander A. Friedmann: The Man who Made the Universe Expand. Indeed, he was the first to realize in 1922 that Einstein's equations have solutions which describe not only a stationary Universe as Einstein initially believed, but also a non-stationary world. Friedmann won the debate with Einstein over the admissibility of such solutions, but his life was too short and he could not see the triumph of his views when the experimental evidence fully supported his predictions and demonstrated that the Universe was expanding. This book contains three papers by Friedmann - "On the Curvature of Space", "On the Possibility of a World with a Constant Negative Curvature of Space", and "On the Geometry of Curved Spaces". The third paper is a 28-page manuscript (dated 15 April 1922) which has not been published even in Russian. Unlike the existing two English translations of Friedmann's 1922 and 1924 papers (done from the German publications), now these papers are translated directly from the original Russian texts.
| Author | : Eleftherios Papantonopoulos |
| Publisher | : Springer Science & Business Media |
| Total Pages | : 322 |
| Release | : 2005-01-07 |
| Genre | : Science |
| ISBN | : 9783540227120 |
The Physics of the Early Universe is an edited and expanded version of the lectures given at a recent summer school of the same name. Its aim is to present an advanced multi-authored textbook that meets the needs of both postgraduate students and young researchers interested in, or already working on, problems in cosmology and general relativity, with emphasis on the early universe. A particularly strong feature of the present work is the constructive-critical approach to the present mainstream theories, the careful assessment of some alternative approaches, and the overall balance between theoretical and observational considerations. As such, this book will also benefit experienced scientists and nonspecialists from related areas of research.
| Author | : Martin Lemoine |
| Publisher | : Springer |
| Total Pages | : 435 |
| Release | : 2007-10-12 |
| Genre | : Science |
| ISBN | : 3540743537 |
Some 25 years after the birth of inflationary cosmology, this volume sets out to provide both an authoritative and pedagogical introduction and review of the current state of the field. Readers learn about the arguments supporting the many different scenarios of cosmic inflation. Articles are written by eminent scientists, many of whom have made pioneering contributions to the field of inflationary cosmology.
