The Theory Behind The Present Accelerating Universe
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The Theory Behind The Present Accelerating Universe
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Author : Shuvendu Chakraborty
language : en
Publisher:
Release Date : 2011-11
The Theory Behind The Present Accelerating Universe written by Shuvendu Chakraborty and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2011-11 with categories.
The Accelerating Expansion Of The Universe
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Author : Paul F. Kisak
language : en
Publisher: Createspace Independent Publishing Platform
Release Date : 2017-07-15
The Accelerating Expansion Of The Universe written by Paul F. Kisak and has been published by Createspace Independent Publishing Platform this book supported file pdf, txt, epub, kindle and other format this book has been release on 2017-07-15 with categories.
11.3 billion years ago a star exploded. It is framed by the constellation Ursa Major. It was photographed in 1997 and it's impact on cosmology theory is still being felt. This exploding star is the Supernova 1997ff type Ia. The discovery and analysis of the radiation that emanates from SN 1997ff is providing support for the theory of "The Accelerating Expansion of our Universe," "Dark Matter," and "Dark Energy." The Hubble discovery also reveals that the universe only recently began speeding up, a discovery that suggests the universe is expanding more quickly than in the past, but there were alternate explanations. The accelerating expansion of the universe is the observation that the universe appears to be expanding at an increasing rate, so that the velocity at which a distant galaxy is receding from the observer is continuously increasing with time. The accelerated expansion was discovered in 1998, by two independent projects, the Supernova Cosmology Project and the High-Z Supernova Search Team, which both used distant type Ia supernovae as standard candles to measure the acceleration. The expansion of the universe is thought to have been accelerating since the universe entered its dark-energy-dominated era roughly 5 billion years ago. Within the framework of general relativity, an accelerating expansion can be accounted for by a positive value of the cosmological constant (Lambda), equivalent to the presence of a positive vacuum energy, dubbed "dark energy." While there are alternative possible explanations, the description assuming dark energy (positive Lambda) is used in the current standard model of cosmology, which also includes cold dark matter (CDM) and is known as the Lambda-CDM model. This book focuses on our Accelerating universe and the theories that support it.This book is designed to be a state of the art, superb academic reference work and provide an overview of the topic and give the reader a structured knowledge to familiarize yourself with the topic at the most affordable price possible. The accuracy and knowledge is of an international viewpoint as the edited articles represent the inputs of many knowledgeable individuals and some of the most current knowledge on the topic, based on the date of publication.
Endless Universe
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Author : Paul J. Steinhardt
language : en
Publisher: Crown
Release Date : 2007-05-29
Endless Universe written by Paul J. Steinhardt and has been published by Crown this book supported file pdf, txt, epub, kindle and other format this book has been release on 2007-05-29 with Science categories.
Two world-renowned scientists present an audacious new vision of the cosmos that “steals the thunder from the Big Bang theory.” —Wall Street Journal The Big Bang theory—widely regarded as the leading explanation for the origin of the universe—posits that space and time sprang into being about 14 billion years ago in a hot, expanding fireball of nearly infinite density. Over the last three decades the theory has been repeatedly revised to address such issues as how galaxies and stars first formed and why the expansion of the universe is speeding up today. Furthermore, an explanation has yet to be found for what caused the Big Bang in the first place. In Endless Universe, Paul J. Steinhardt and Neil Turok, both distinguished theoretical physicists, present a bold new cosmology. Steinhardt and Turok “contend that what we think of as the moment of creation was simply part of an infinite cycle of titanic collisions between our universe and a parallel world” (Discover). They recount the remarkable developments in astronomy, particle physics, and superstring theory that form the basis for their groundbreaking “Cyclic Universe” theory. According to this theory, the Big Bang was not the beginning of time but the bridge to a past filled with endlessly repeating cycles of evolution, each accompanied by the creation of new matter and the formation of new galaxies, stars, and planets. Endless Universe provides answers to longstanding problems with the Big Bang model, while offering a provocative new view of both the past and the future of the cosmos. It is a “theory that could solve the cosmic mystery” (USA Today).
Theory Challenges Of The Accelerating Universe
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Author :
language : en
Publisher:
Release Date : 2007
Theory Challenges Of The Accelerating Universe written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2007 with categories.
The accelerating expansion of the universe presents an exciting, fundamental challenge to the standard models of particle physics and cosmology. I highlight some of the outstanding challenges in both developing theoretical models and interpreting without bias the observational results from precision cosmology experiments in the next decade that will return data to help reveal the nature of the new physics. Examples given focus on distinguishing a new component of energy from a new law of gravity, and the effect of early dark energy on baryon acoustic oscillations.
Understanding The Universe
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Author : Manjunath.R
language : en
Publisher: Manjunath.R
Release Date : 2020-03-17
Understanding The Universe written by Manjunath.R and has been published by Manjunath.R this book supported file pdf, txt, epub, kindle and other format this book has been release on 2020-03-17 with Antiques & Collectibles categories.
A Scientific Introduction to Subatomic particles, Alien Intelligence, and Human Space Exploration (For the Cosmically Curious): There are many fundamental questions about the universe that have intrigued scientists, philosophers, and ordinary people for centuries. Here are a few of them: What is the universe made of? This is one of the most basic questions about the universe. Scientists have identified a number of different types of matter and energy, including atoms, subatomic particles, dark matter, and dark energy, but there is still much we don't know. How did the universe begin? The origin of the universe is a subject of intense study and debate. The prevailing theory is the Big Bang, which suggests that the universe began as a singularity and has been expanding ever since. What is the ultimate fate of the universe? Will it keep on expanding indefinitely or will it ultimately come to an end? Some theories suggest that the universe may end in a "big rip" or a "big crunch," while others suggest that it will continue to expand indefinitely. What is the nature of space and time? These are fundamental concepts that are still not fully understood. Some theories suggest that space and time are intertwined and that they can be distorted by the presence of matter and energy. Are there other universes beyond our own? Some theories suggest that our universe may be just one of many in a "multiverse." Although this theory is yet hypothetical, it is a fascinating concept that could have significant ramifications for our comprehension of the cosmos. These are just a few of the many fundamental questions about the universe that scientists and philosophers continue to explore. "Understanding the Universe: Quarks, Leptons and the Big Bang" is a comprehensive exploration of the fundamental principles that govern the universe we live in. From the tiniest particles to the grandest structures in the cosmos, this book takes readers on a journey of discovery through the mysteries of modern physics and cosmology. Starting with an introduction to the basic building blocks of matter, the book delves into the strange world of quarks and leptons, exploring their properties and interactions. It then examines the forces that govern the behavior of matter, including the strong and weak nuclear forces, electromagnetism, and gravity. The book also covers the history of the universe, from its origins in the Big Bang to the present day, and discusses the evolution of stars and galaxies. Readers will gain a deep understanding of the structure of the universe, its expansion, and the mysterious dark matter and dark energy that make up the vast majority of its mass. Filled with engaging examples, clear explanations, and fascinating insights, "Understanding the Universe: Quarks, Leptons and the Big Bang" is a must-read for anyone interested in the inner workings of the cosmos. Whether you're a student of physics, a science enthusiast, or simply curious about the universe, this book will provide you with a solid foundation for understanding the world around us.
Conceptions Of Cosmos
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Author : Helge S. Kragh
language : en
Publisher: OUP Oxford
Release Date : 2006-12-07
Conceptions Of Cosmos written by Helge S. Kragh and has been published by OUP Oxford this book supported file pdf, txt, epub, kindle and other format this book has been release on 2006-12-07 with Science categories.
This book is a historical account of how natural philosophers and scientists have endeavoured to understand the universe at large, first in a mythical and later in a scientific context. Starting with the creation stories of ancient Egypt and Mesopotamia, the book covers all the major events in theoretical and observational cosmology, from Aristotle's cosmos over the Copernican revolution to the discovery of the accelerating universe in the late 1990s. It presents cosmology as a subject including scientific as well as non-scientific dimensions, and tells the story of how it developed into a true science of the heavens. Contrary to most other books in the history of cosmology, it offers an integrated account of the development with emphasis on the modern Einsteinian and post-Einsteinian period. Starting in the pre-literary era, it carries the story onwards to the early years of the 21st century.
An Introduction To The Science Of Cosmology
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Author : Derek Raine
language : en
Publisher: CRC Press
Release Date : 2018-10-03
An Introduction To The Science Of Cosmology written by Derek Raine and has been published by CRC Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2018-10-03 with Science categories.
A thorough introduction to modern ideas on cosmology and on the physical basis of the general theory of relativity, An Introduction to the Science of Cosmology explores various theories and ideas in big bang cosmology, providing insight into current problems. Assuming no previous knowledge of astronomy or cosmology, this book takes you beyond introductory texts to the point where you are able to read and appreciate the scientific literature, which is broadly referenced in the book. The authors present the standard big bang theory of the universe and provide an introduction to current inflationary cosmology, emphasizing the underlying physics without excessive technical detail. The book treats cosmological models without reliance on prior knowledge of general relativity, the necessary physics being introduced in the text as required. It also covers recent observational evidence pointing to an accelerating expansion of the universe. The first several chapters provide an introduction to the topics discussed later in the book. The next few chapters introduce relativistic cosmology and the classic observational tests. One chapter gives the main results of the hot big bang theory. Next, the book presents the inflationary model and discusses the problem of the origin of structure and the correspondingly more detailed tests of relativistic models. Finally, the book considers some general issues raised by expansion and isotropy. A reference section completes the work by listing essential formulae, symbols, and physical constants. Beyond the level of many elementary books on cosmology, An Introduction to the Science of Cosmology encompasses numerous recent developments and ideas in the area. It provides more detailed coverage than many other titles available, and the inclusion of problems at the end of each chapter aids in self study and makes the book suitable for taught courses.
Cosmic Acceleration
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Author : Nishant Agarwal
language : en
Publisher:
Release Date : 2011
Cosmic Acceleration written by Nishant Agarwal and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2011 with categories.
Our Universe has an exciting history of accelerated expansion. Following its inception in an event known as the big bang, the Universe underwent a phase of exponential expansion called inflation. Although precise observations of the cosmic microwave background (CMB) radiation and large-scale structure support the inflationary paradigm, the absence of a firm physical mechanism for inflation has led to a plethora of theoretical embarkments attempting to understand its genesis. Inflation lasted only for a fraction of a second, but observations suggest that thirteen billion years after inflation, the Universe began accelerating once again. This acceleration, which continues till date, is attributed to a mysterious component, dubbed dark energy, that fills up our Universe and accounts for almost 73% of the total energy density in the Universe. In this thesis we study and develop models of inflation and dark energy, in the light of current observations. We begin, in Chapter 1, with a detailed introduction to cosmic acceleration, and discuss various models of inflation and dark energy that have been studied in the literature in the recent years. In Chapter 2, we discuss how a hierarchy of Hubble flow parameters, extended to include the evolution of the inflationary sound speed, can be applied to compare a general, single-field inflationary action with cosmological observational data. In Chapter 3, we study the six-field dynamics of D3-brane inflation for a general scalar potential on the conifold, finding simple, universal behavior, such as a power law dependence for the probability of Ne e-folds of inflation. Subsequent chapters study modifications to the theory of gravity in an attempt to understand dark energy. In Chapter 4, we establish the dynamical attractor behavior in scalar-tensor theories of gravity, providing a powerful framework to analyze such theories, predicting common evolutionary characteristics that can be compared against cosmological constraints. Chapter 5 develops a cascading cosmology framework in order to study the cosmological implications of a sixdimensional (6D) theory of gravity. We find that cascading cosmology can indeed lead to an accelerating Universe. Finally, in Chapter 6, we study the issue of ghostlike instabilities in the cascading framework, and propose a mechanism to obtain flat brane and bulk solutions. We conclude in Chapter 7 with a discussion of the main results presented in this thesis.
Accelerating Universe And Its Structure
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Author : MR Sebastian Aloysius a
language : en
Publisher: CreateSpace
Release Date : 2013-12-29
Accelerating Universe And Its Structure written by MR Sebastian Aloysius a and has been published by CreateSpace this book supported file pdf, txt, epub, kindle and other format this book has been release on 2013-12-29 with Science categories.
In this book I am trying to explain the structure of expanding universe on my point of view. The acceleration on its expansion and the roll of relativity during the acceleration of universe. Trying to explain about the gravity and the gravitational frame of universe. Also discussing about the dark energy and its importance to the accelerating universe and the gravitational frame.According to me the dark energy (negative vacuum) is absorbing from the empty space during the expansion of universe and to the frame and then center of the frame. So concentrated in the center of the universe. The force produced by the big bang is carrying the positive energy and the positive energy is creating a uniform gravitational frame for the expanding universe. All the present positive energy is contributing its gravitational potential field to the frame. Universe is absorbing negative vacuum energy into it once it is occupying the empty space. This absorbed vacuum energy will be pulled to the center of the universe. It will create a negative pressure inside the gravitational frame of the universe. It will cause the increase of volume of the gravitational frame of universe. Due to the increase of the volume of the frame the gravitational force between the positive matters inside the frame will decrease. It will allow them to move away each other. This is a new thought. Here I am trying to explain the gravity and the origin of mass in my view. I am not a scientist or researcher; I am just an observer of my surroundings and trying to find some solutions. My experiences are only reading articles on internet sites. Here I wants to open my thoughts for the world. So I did this.......................... Aloysius Sebastian
Scientific Information About The Universe And The Scientific Theories Of The Evolution Of The Universe
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Author : Rick Adair
language : en
Publisher: The Rosen Publishing Group
Release Date : 2006
Scientific Information About The Universe And The Scientific Theories Of The Evolution Of The Universe written by Rick Adair and has been published by The Rosen Publishing Group this book supported file pdf, txt, epub, kindle and other format this book has been release on 2006 with Science categories.
The articles in this collection focus on the revolution in cosmology that took place in 1998 that has shaken scientists' understanding of the universe. Until then, scientists believed that the universe had been expanding for billions of years but was slowing down. However, data collected and analyzed since 1998 points to an accelerating universe. Each article in this educational anthology covers the authors' insights into the new mysterious universe.