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Books > Science & Mathematics > Astronomy, space & time > Cosmology & the universe
In den letzten Dekaden hat das Gebiet der klassischen dynamischen
Systeme eine beachtliche Renaissance erlebt, und manches, was beim
erst en Erscheinen dieses Kur- ses als mathematisch zu
hochgestochen erschien, ist heute Gemeingut der aktiven Physiker
geworden. Das Ziel der Neuauflage ist es, . dieser Entwicklung zu
dienen, indem ich versucht habe, das Buch leserfreundlicher zu
gestalten und Fehler auszu- merzen. Da schon die erste Auflage ffir
eine einsemestrige Vorlesung reichlich beladen war, wurde neues
Material nur in dem Mafie aufgenommen, als anderes weggelassen oder
vereinfacht werden konnte. Eine Erweiterung muf3te jedoch das
Kapitel mit dem Be- weis des KAM-Satzes erfahren, urn dem neuen
Trend in der Physik Rechnung zu tragen. Dieser besteht nicht nur in
der Verwendung feinerer mathematischer Hilfs- mittel, sondern auch
in einer Neubewertung des Wortes "fundamental". Was frfiher als
Schmutzeffekt abgetan wurde, erscheint heute als Folge eines
tieferen Prinzips. Ja so- gar diese Keplerschen Gesetze, welche die
Radien der Planetenbahnen bestimmen und die man als mystischen
Unsinn gerne verschwieg, scheinen in Richtung einer Wahrheit zu
deuten, die sich oberflachlicher Betrachtung verschlief3t:
SchachteluI). g vollkomme- ner platonischer Korper ffihrt zu
Verhaltnissen von Radien, die irrational sind, aber algebraischen
Gleichungen niederer Ordnung genfigen. Gerade solche
Irrationalzahlen lassen sich am schlechtesten durch rationale
approximieren, und Bahnen mit diesem Radiusverhaltnis sind
gegenfiber gegenseitigen Storungen am robustesten, da sie am
wenigsten unter Resonanzeffekten leiden. In letzter Zeit wurden
einige fiberraschende Resultate fiber chaotische Systeme gefunden,
doch hat ten deren Beweise leider den Rahmen dieses Buches
gesprengt und muf3ten unterbleiben.
Astronomer Joseph Silk explores the Universe from its beginnings to
its ultimate fate. He demonstrates how cosmologists study cosmic
fossils and relics from the distant past to construct theories of
the birth, evolution and future of the Universe. Stars, galaxies,
dark matter and dark energy are described, as successive chapters
detail the evolution of the Universe from a fraction of a
microsecond after the Big Bang. Silk describes how physicists apply
theories of subatomic particles to recreate the first moments of
the Big Bang, and how astronomers chart the vast depths of space to
glimpse how the most distant galaxies formed. He gives an account
of the search for dark matter and the dark energy that will
determine the ultimate fate of the Universe. Joseph Silk is the
Savilian Professor of Astronomy and Head of the Astrophysics
Department at the University of Oxford. He was previously Professor
of Astronomy at the University of California, Berkeley. He holds a
BA in Mathematics from Clare College, Cambridge, and a PhD in
Astronomy from Harvard University. Silk is the author, or
co-author, of many books, including The Left Hand of Creation
(Basic Books, 1994) and A Short History of the Universe (WH
Freeman, 1997). He is a Fellow of the Royal Society, the American
Physical Society, and the American Association for the Advancement
of Science.
Brian Greene's The Hidden Reality: Parallel Universes and the Deep
Laws of the Cosmos explores our most current scientific
understanding of the universe, the 'string theory' that might hold
the key to unifying nature's laws, and our continuing quest to know
more. There was a time when 'universe' meant all there is.
Everything. Yet, as physicist Brian Greene's extraordinary book
shows, ours may be just one universe among many, like endless
reflections in a mirror. He takes us on a captivating exploration
of parallel worlds - from a multiverse where an infinite number of
your doppelgangers are reading this sentence, to vast oceans of
bubble universes and even multiverses made of mathematics - showing
just how much of reality's true nature may be hidden within them.
'If extraterrestrials land tomorrow and demand to know what the
human mind is capable of accomplishing ... hand them a copy of this
book' The New York Times Book Review 'A writer of exceptional
clarity and charm ... every chapter opens level after level of
previously unimaginable, mind-expanding realities' Oliver Sacks
'The book serves well as an introduction to the multiverse and will
open up many people's eyes' John Gribbin Brian Greene is well known
to many fans as a populariser of theoretical physics. He is the
author of the bestselling books about string theory, The Elegant
Universe, which was a finalist for the Pulitzer Prize for
nonfiction, The Fabric of the Cosmos, and The Hidden Reality.
Educated at Harvard and Oxford, he has taught at both Harvard and
Cornell and has been Professor of Physics and Mathematics at
Columbia University since 1996.
'Includes exciting recent advances in studying gravity and its
cosmic manifestations.' Lord Martin Rees, Astronomer Royal, former
President of the Royal Society A fascinating historical account of
how we have reached our current understanding of gravity. There
have been sensational developments in gravitational physics in
recent years. The detection of gravitational waves - ripples in the
fabric of space - has opened a new window on the universe. These
waves are produced by the most cataclysmic events in the universe -
the collisions and mergers of black holes and neutron stars. There
have also been great strides in our understanding of supermassive
black holes. We now know that a black hole with a gargantuan mass
lies at the heart of every galaxy, and we even have an image of one
such beast. Gravity: From Falling Apples to Supermassive Black
Holes provides an engaging and accessible account of how we have
reached our current understanding of gravity and places these
amazing discoveries in their true context. Gravity: From Falling
Apples to Supermassive Black Holes is written in a captivating
historical style with stories about the researchers of the past and
present that illuminate many key ideas in astronomy and physics.
The historical material leads from discussions of the early
cosmologies to the great breakthroughs of Tycho and Kepler. We then
consider Galileo's contributions to astronomy and mechanics, and
the significance of Jeremiah Horrocks's ideas to the Newtonian
revolution that would follow. Newton's theories brought about a new
scientific age and his description of gravity was unrivalled for
over two centuries until it was superseded by Einstein's
description in terms of curved spacetime. The outlandish
predictions of Einstein's theory have been confirmed again and
again, including black holes and gravitational waves. Finally, we
move on to more speculative ideas including Hawking radiation and
primordial black holes and attempts to find a quantum theory of
gravity.
In The Accidental Universe renowned expositor Paul Davies grapples
with the most fundamental questions of all. What is our purpose and
the purpose of the universe? Are both an accident of nature? Paul
Davies guides us through the mysterious coincidences underlying the
structure and properties of the universe we inhabit. He sets out
the intriguing hypothesis that the appearance of the universe and
its properties are highly contrived. Paul Davies gives a survey of
the range of apparently miraculous accidents of nature that have
enabled the universe to evolve its familiar structure of atoms,
stars, galaxies and life itself. This remarkable book concludes
with an investigation of the anthropic principle, which postulates
that much of what we observe around us is a consequence of the
presence of observers in the universe. This thesis of a cosmic
biological selection effect is fiercely debated among scientists
and is here set out clearly for a general readership.
This book explores the great ontological question, namely, what is
the meaning of life. And it's in two parts. The first part looks at
psychological, philosophical, sociological and spiritual theories,
which includes witchcraft. This sets the stage for part two, which
addresses religion, politics, prophecy, aliens/UFOs, and scientific
explanations for our existence. The mind is the common thread that
links the chapters. Fundamentally, we're on the brink of a New
World Order that's been orchestrated by Satan and for Satan. He's
on his sordid way. Thus, it bodes well to be prepared for the
coming great deception.
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