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STUDY OF ACCELERATED COSMIC EXPANSION

2022-08-09 Science
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Release : 2022-08-09
Genre : Science
Kind : eBook
Book Rating : 699/5 ( reviews)

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Book Synopsis STUDY OF ACCELERATED COSMIC EXPANSION by : Nisha Rani

Download or read book STUDY OF ACCELERATED COSMIC EXPANSION written by Nisha Rani. This book was released on 2022-08-09. Available in PDF, EPUB and Kindle. Book excerpt: Physical cosmology includes the scientific study of the origin, evolution and dynamics of the universe. Due to impressive progress both on the theoretical and observational side, scientists are able to resolve many of the puzzles of the universe. Nevertheless, many questions are not answered completely. For instance, "What are the constituents of the universe?" and "How does the dynamics of the universe evolve?" The curiosity to get convincing answers to these questions, motivates one to work in this field. According to the hot Big Bang model, the universe started from a bang and its properties change with time. The discovery of the Cosmic Microwave Background Radiation (CMBR) by Penzias and Wilson in 1965 was important in making the Big Bang model the accepted model of the universe [5]. A landmark discovery in 1998 by two groups working independently on Supernovae Ia was instrumental in changing the way we understand our universe. They found that the expansion of the universe is accelerating [6, 7]. To explain the accelerated expansion of the universe, various models have been proposed. The most widely accepted one is the Lambda Cold Dark Matter (ΛCDM) model [8]. According to this model, the universe is flat and is expanding at an accelerated rate. It is composed of baryonic matter, dark matter and dark energy. Dark energy is the name given to the cause of the cosmic acceleration.

Accelerated Cosmic Expansion

2013-11-29 Science
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Release : 2013-11-29
Genre : Science
Kind : eBook
Book Rating : 633/5 ( reviews)

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Book Synopsis Accelerated Cosmic Expansion by : Claudia Moreno González

Download or read book Accelerated Cosmic Expansion written by Claudia Moreno González. This book was released on 2013-11-29. Available in PDF, EPUB and Kindle. Book excerpt: Proceedings from the 2012 Fourth International Meeting on Gravitation and Cosmology, focusing on accelerated cosmic expansion This volume provides both an update and a review of the state of alternative theories of gravity in connection with the accelerated expansion of the universe issue. Different theoretical proposals exist to explain the acceleration in the cosmic expansion, generating the dark energy issue and opening the possibility to theories of gravity alternative to general relativity. Related issues such as the dark matter problem are also surveyed in order to give the readers profound insight on the subject from different points of view. Comprised of short talks and plenary lectures given by leading experts in the field, some of them with brilliant and historic contributions, the book allows the reader to find readable and referenced surveys in topics like f(R) theories, the dark matter and dark energy issues, Modified Newtonian Dynamics (MOND) scenarios, f(T) theories, scalar-tensor theories derived from non-Riemannian geometries, emergent universes, the cosmological constant and other topics of current interest for younger and senior physicists and graduate students. These proceedings are from the Fourth International Meeting on Gravitation and Cosmology, held in Guadalajara, Jalisco, México, from 20 - 25 May, 2012, was sponsored by ICTP- Trieste, Italy and COECyTJAL-Universidad de Guadalajara, México. This event is a series of scientific meetings started in 2004 in Cuba, focusing on current and selected topics in the fields of gravitation and cosmology.

Expansion of the Universe

Science
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Genre : Science
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Book Synopsis Expansion of the Universe by : Steff Jaywan

Download or read book Expansion of the Universe written by Steff Jaywan. This book was released on . Available in PDF, EPUB and Kindle. Book excerpt: The universe is a vast and enigmatic expanse, filled with countless mysteries that have intrigued scientists and philosophers for centuries. One of the most profound discoveries of modern cosmology is that the universe is not only expanding but doing so at an accelerating rate. This revelation has reshaped our understanding of the cosmos and introduced the concept of dark energy as a dominant force driving this acceleration. In this book, we embark on a journey through the history of cosmological thought, from the early observations that hinted at an expanding universe to the groundbreaking discoveries that revealed its acceleration. We will explore the role of the cosmological constant, a term introduced by Einstein in his equations of General Relativity, which has come to be associated with dark energy. We begin with a foundational understanding of the universe's expansion, delving into the Big Bang theory and the key observations that support it. From there, we examine the pivotal role of the cosmological constant and its implications for the structure and fate of the universe. As we navigate through the complexities of dark energy and its various theoretical models, we will also address the challenges and alternative theories that scientists are exploring to explain this cosmic acceleration. Finally, we will consider the future of cosmological research, highlighting the ongoing quests to unravel the mysteries that still elude us.

Accelerating Expansion

2023-08-24 Mathematics
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Release : 2023-08-24
Genre : Mathematics
Kind : eBook
Book Rating : 46X/5 ( reviews)

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Book Synopsis Accelerating Expansion by : Gordon Belot

Download or read book Accelerating Expansion written by Gordon Belot. This book was released on 2023-08-24. Available in PDF, EPUB and Kindle. Book excerpt: Accelerating Expansion explores some of the philosophical implications of modern cosmology, focused on the significance that the discovery of the accelerating expansion of the Universe has for our understanding of time, geometry, and physics. The appearance of the cosmological constant in the equations of general relativity allows one to model universes in which space has an inherent tendency towards expansion. This constant, introduced by Einstein but subsequently abandoned by him, returned to centre stage with the discovery of the accelerating expansion. This pedagogically-oriented essay begins with a study of the most basic and elegant relativistic world that involves a positive cosmological constant, de Sitter spacetime. It then turns to the relatives of de Sitter spacetime that dominate modern relativistic cosmology. Some of the topics considered include: the nature of time and simultaneity in de Sitter worlds; the sense in which de Sitter spacetime is a powerful dynamical attractor; the limited extent to which observation can give us information about the topology of space in a world undergoing accelerated expansion; and cosmologists' favourite sceptical worry about the reliability of evidence and the possibility of knowledge, the problem of Boltzmann brains.

The Accelerating Universe

2008-05-02 Science
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Release : 2008-05-02
Genre : Science
Kind : eBook
Book Rating : 294/5 ( reviews)

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Book Synopsis The Accelerating Universe by : Mario Livio

Download or read book The Accelerating Universe written by Mario Livio. This book was released on 2008-05-02. Available in PDF, EPUB and Kindle. Book excerpt: Advance Praise for The Accelerating Universe "The Accelerating Universe is not only an informative book about modern cosmology. It is rich storytelling and, above all, a celebration of the human mind in its quest for beauty in all things." —Alan Lightman, author of Einstein's Dreams "This is a wonderfully lucid account of the extraordinary discoveries that have made the last years a golden period for observational cosmology. But Mario Livio has not only given the reader one clear explanation after another of what astronomers are up to, he has used them to construct a provocative argument for the importance of aesthetics in the development of science and for the inseparability of science, art, and culture." —Lee Smolin, author of The Life of the Cosmos "What a pleasure to read! An exciting, simple account of the universe revealed by modern astronomy. Beautifully written, clearly presented, informed by scientific and philosophical insights." —John Bahcall, Institute for Advanced Study "A book with charm, beauty, elegance, and importance. As authoritative a journey as can be taken through modern cosmology." —Allan Sandage, Observatories of the Carnegie Institution of Washington

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