Essays on the Frontiers of Modern Astrophysics and Cosmology PDF Download
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Author: Santhosh Mathew
Publisher: Springer Science & Business Media
ISBN: 3319018876
Category : Science
Languages : en
Pages : 229
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Book Description
This book is a collection of fourteen essays that describe an inspiring journey through the universe and discusses popular science topics that modern physics and cosmology are struggling to deal with. What is our place in the universe and what happens in the magnificent cosmos where we exist for a brief amount of time. In an unique way that incorporates mythological and philosophical perspectives, the essays in this work address the big questions of what the universe is, how it came into being, and where it may be heading. This exciting adventure is a rich scientific history of elegant physics, mathematics, and cosmology as well as a philosophical and spiritual pursuit fueled by the human imagination.
Author: Santhosh Mathew
Publisher: Springer Science & Business Media
ISBN: 3319018876
Category : Science
Languages : en
Pages : 229
Get Book Here
Book Description
This book is a collection of fourteen essays that describe an inspiring journey through the universe and discusses popular science topics that modern physics and cosmology are struggling to deal with. What is our place in the universe and what happens in the magnificent cosmos where we exist for a brief amount of time. In an unique way that incorporates mythological and philosophical perspectives, the essays in this work address the big questions of what the universe is, how it came into being, and where it may be heading. This exciting adventure is a rich scientific history of elegant physics, mathematics, and cosmology as well as a philosophical and spiritual pursuit fueled by the human imagination.
Author: Willem Wamsteker
Publisher: Springer Science & Business Media
ISBN: 9401107947
Category : Science
Languages : en
Pages : 721
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Book Description
ROSAT Observations G. HASINGER Max-Planck-Institut flir extraterrestrische Physik, D-85740 Garching, Germany Abstract. This review describes the most recent advances in the study of the extragalactic soft X-ray background and what we can learn about its constituents. The deepest pointed observations with the ROSAT PSPC are discussed. The logN-logS relation is presented, which reaches to the faintest X-ray fluxes and to the highest AGN surface densities ever achieved. The N(>S) relation shows a 2 density in excess of 400 deg- at the faintest fluxes and a flattening below the Einstein Deep Survey limit. About 60% of the extragalactic background has been resolved in the deepest field. Detailed source spectra and first optical and radio identifications will be discussed. The results are put into perspective of the higher energy X -ray background. Key words: X-rays, background radiations, active galactic nuclei. 1. Introduction The extragalactic X-ray background (XRB), discovered about 30 years ago, has been studied extensively with many X-ray experiments, in particular with the satel lites HEAO I and II (see ego Boldt 1987) and with ROSAT (e. g. Hasinger et aI. , 1993). Figure 1 shows a compilation of some of the most recent spectral measure ments for the X-ray background. Over the energy range from 3 to about 100 keY its spectrum can be well approximated by an optically thin thermal bremsstrahlung model with kT ~ 40 keY, while at lower X-ray energies a steepening into a new component has been observed observed (e. g.
Author: Pedro Ferreira
Publisher: Weidenfeld & Nicolson
ISBN: 1780225296
Category : Science
Languages : en
Pages : 331
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Book Description
A masterly overview of the development of cosmological thinking from the Greeks, via Newton and Einstein, to the present day. It is science's last and greatest challenge: fathoming the depths of the night sky. The objective: to crack the cosmic code, to unravel the blueprint for nature's grandest conception, a machine constructed on an unimaginably vast scale - the Universe itself. Today's model of an expanding Universe - the big bang cosmology - is actually built on principles derived from a few simple mathematical equations. Gravity-warped space time, quantum mechanics, the physics of the subatomic, these crucial insights, stemming from Einstein's revolutionary theories of relativity, have led to a simple and elegant framework within which the whole of the Universe, over billions of years, has been described. But recent evidence has begun to make wrinkles in the neat fabric of the big bang cosmology. There is now overwhelming evidence that there is far more stuff in the Universe than we can see. What, and where, is this 'dark matter'? And it now appears that the expansion of the Universe is accelerating: something out there - some exotic 'dark energy' - is acting against gravity to push space and time apart. While offering a critical view of how all the pieces in our current model fit together, Pedro Ferreira argues that Einstein's Universe may be just another stepping stone towards a new, more profound and effective cosmology in the future.
Author: Eugene H. Avrett
Publisher:
ISBN: 9780674325593
Category :
Languages : en
Pages : 554
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Book Description
Author: FIELD
Publisher: Springer Science & Business Media
ISBN: 1461581842
Category : Science
Languages : en
Pages : 193
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Book Description
Author: Joseph Silk
Publisher: OUP Oxford
ISBN: 0191623024
Category : Science
Languages : en
Pages : 258
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Book Description
From time immemorial, poets and philosophers have looked in awe and wonder at the Universe. Such awe is shared by astrophysicists, too, as they seek to understand its nature, and whether it has any limits. In The Infinite Cosmos, Joseph Silk, Savilian Professor of Astronomy at Oxford University, cosmologist and well-known science writer, brings together the modern understanding of the Universe, its structure, its evolution, and its possible fate, combining the latest from theory and observation. The narrative is peppered with quotations from literature and philosophy, and reflects, too, on the process of scientific discovery, and the implications of our discoveries.
Author: Ethan Siegel
Publisher: World Scientific
ISBN: 9814667188
Category : Science
Languages : en
Pages : 387
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Book Description
A look up at the night sky reveals a treasury of wonders. Even to the naked eye, the Moon, stars, planets, the Milky Way and even a few star clusters and nebulae illuminate the heavens. For millennia, humans struggled to make sense of what's out there in the Universe, from all we can see to that which lies beyond the limits of even our most powerful telescopes. Beyond the Galaxy traces our journey from an ancient, Earth-centered Universe all the way to our modern, 21st century understanding of the cosmos. Touching on not only what we know but also how we know it, Ethan Siegel takes us to the very frontiers of modern astrophysics and cosmology, from the birth of our Universe to its ultimate fate, and everything in between.
Author: S. K. Biswas
Publisher: Cambridge University Press
ISBN: 0521343542
Category : Science
Languages : en
Pages : 0
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Book Description
Modern cosmology and its relationship to the development of human civilization is the subject of this book. Astronomers, cosmologists and historians have contributed fourteen essays covering a wide range of subjects. These include the place of astronomy in China by Joseph Needham, frontiers in cosmology by Fred Hoyle, the dark matter problem by Bernard Carr and the origin of life by Cyril Ponnamperuma. There are also contributions on astrology, science fiction and science.
Author: Pedro G. Ferreira
Publisher: Cassell
ISBN: 9780297847403
Category : Science
Languages : en
Pages : 320
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Book Description
It is science¿s last and greatest challenge: fathoming the depths of the night sky. The objective: to crack the cosmic code, to unravel the blueprint for nature¿s grandest conception, a machine constructed on an unimaginably vast scale ¿ the Universe itself. Vast ¿ and also complex? Today¿s model of an expanding Universe ¿ the big bang cosmology ¿ is actually built on principles derived from a few simple mathematical equations. Gravity-warped space¿time, quantum mechanics, the physics of the subatomic ¿ these crucial insights, stemming from Einstein¿s revolutionary theories of relativity, have led to a simple and elegant framework within which the whole of the Universe, over billions of years, has been described. But recent evidence has begun to make wrinkles in the neat fabric of the big bang cosmology. There is now overwhelming evidence that there is far more stuff in the Universe than we can see. What, and where, is this ¿dark matter¿? And it now appears that the expansion of the Universe is accelerating: something out there ¿ some exotic ¿dark energy¿ ¿ is acting against gravity to push space and time apart. While offering a critical view of how all the pieces in our current model fit together, Pedro Ferreira argues that Einstein¿s Universe may be just another stepping stone towards a new, more profound and effective cosmology in the future.
Author: Yurij Baryshev
Publisher: Springer
ISBN: 9789400723788
Category : Science
Languages : en
Pages : 332
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Book Description
This book guides readers (astronomers, physicists, and university students) through central questions of Practical Cosmology, a term used by the late Allan Sandage to denote the modern scientific endeavor to find the cosmological model best describing the universe of galaxies, its geometry, size, age, and matter composition. The authors draw on their personal experience in astrophysics and cosmology to explain key concepts of cosmology, both observational and theoretical, and to highlight several items which give cosmology its special character. These highlighted items are: Ideosyncratic features of the “cosmic laboratory”, Malmquist bias in the determination of cosmic distances, Theory of gravitation as a cornerstone of cosmological models, Crucial tests for checking the reality of space expansion, Methods of analyzing the structures of the universe as mapped by galaxies, Usefulness of fractals as a model to describe the large-scale structure and new cosmological physics inherent in the Friedmann world model.
