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Books > Science & Mathematics > Astronomy, space & time > General
This volume shows how collective magnetic excitations determine most of the magnetic properties of itinerant electron magnets. Previous theories were mainly restricted to the Curie-Weiss law temperature dependence of magnetic susceptibilities. Based on the spin amplitude conservation idea including the zero-point fluctuation amplitude, this book shows that the entire temperature and magnetic field dependence of magnetization curves, even in the ground state, is determined by the effect of spin fluctuations. It also shows that the theoretical consequences are largely in agreement with many experimental observations. The readers will therefore gain a new comprehensive perspective of their unified understanding of itinerant electron magnetism.
Analytical solutions to the orbital motion of celestial objects have been nowadays mostly replaced by numerical solutions, but they are still irreplaceable whenever speed is to be preferred to accuracy, or to simplify a dynamical model. In this book, the most common orbital perturbations problems are discussed according to the Lie transforms method, which is the de facto standard in analytical orbital motion calculations.
Recent Issues and Advances in Astronomy explores the most important developments in astronomy over the last decade, including the results of recent investigations on extrasolar planetary systems, black holes, and the existence of water in space. Besides exploring the societal implications of recent developments, the book also addresses the philosophical questions raised by recent advances, such as whether or not we are alone in the universe. Other chapters offer biographies of prominent astronomers, discussions of important current investigations, summaries of astronomical funding and career statistics, and a glossary of terms. The book also provides an annotated listing of relevant organizations and bibliographies of print and nonprint information resources. The book is illustrated and extensively cross-referenced, and includes a detailed subject index. A special chapter comprises narratives written by four trained astronomers, each of whom describes the particular career path he or she has chosen, both inside and outside the field of astronomy itself.
Translated from the original French by Bernard Sheehan; Edited and with an introduction byDr. William Sheehan, a neuroscientist and amateur astronomer who is also a research fellow of the Lowell Observatory in Flagstaff, Arizona Le Verrier was a superb scientist. His discovery of Neptune in 1846 made him the most famous astronomer of his time. He produced a complete theory of the motions of the planets which served as a basis for planetary ephemeris for a full century. Doing this, he discovered an anomaly in the motion of Mercury which later became the first proof of General Relativity. He also founded European meteorology. However his arrogance and bad temper created many enemies, and he was even fired from his position of Director of the Paris Observatory."
Lectures.- Neutron Interferometry - Macroscopic Manifestations of Quantum Mechanics.- The Geometry of Matter Fields.- Quantum Mechanics in Curved Space-Times - Stochastic Processes on Frame Bundles.- Particles and Fields.- Quantum Mechanics of Black Holes in Curved Space-Time.- Absorption Cross Section of a Mini Black Hole.- Particle Creation and Vacuum Polarization near Black Holes.- Vacuum States in Space-Times with Killing Horizons.- Mutually Interacting Quantum Fields in Curved Space-Time: The Outcome of Physical Processes.- Quantum Strings in Curved Space-Times.- The Probabilistic Time and the Semiclassical Approximation of Quantum Gravity.- Quantum and Statistical Effects in Superspace Cosmology.- On Quantum Gravity for Homogeneous Pure Radiation Universes.- Nonlinear Sigma Models in 4 Dimensions: A Lattice Definition.- Seminars.- Berry's Phase and Particle Interferometry in Weak Gravitational Fields.- The Final State of an Evaporating Black Hole and the Dimensionality of the Space-Time.- Inflation with Massive Spin-2 Field in Curved Spa?e-Time.- Renormalization of Field Theories in Riemann-Cartan Space-Time.
These astute essays describe the way ordinary people value human relationships and reason through the commonplace contradictions of their local way of life in a global age, rather than measure the actions of their subjects as evidence of either universal rationality or shared cultural beliefs. Each contributor conveys the ways in which people challenge the ascribed moral standards of custom, religious belief, bureaucratic policies through passionate words such as anecdotes, joke, rumors, and gossip. By evaluating moral reasoning at a local level, contributors work to answer the question, what is a good life?
This book reviews the phenomenology displayed by relativistic jets as well as the most recent theoretical efforts to understand the physical mechanisms at their origin. Relativistic jets have been observed and studied in Active Galactic Nuclei (AGN) for about half a century and are believed to be fueled by accretion onto a supermassive black hole at the center of the host galaxy. Since the first discovery of relativistic jets associated with so-called "micro-quasars" much more recently, it has seemed clear that much of the physics governing the relativistic outflows in stellar X-ray binaries harboring black holes and in AGN must be common, but acting on very different spatial and temporal scales. With new observational and theoretical results piling up every day, this book attempts to synthesize a consistent, unified physical picture of the formation and disruption of jets in accreting black-hole systems. The chapters in this book offer overviews accessible not only to specialists but also to graduate students and astrophysicists working in other areas. Covered topics comprise Relativistic jets in stellar systems Launching of AGN jets Parsec-scale AGN jets Kiloparsec-scale AGN jets Black hole magnetospheres Theory of relativistic jets The structure and dynamics of the inner accretion disk The origin of the jet magnetic field X-ray observations, phenomenology, and connection with theory
In the past few years, general astronomical interest has concentrated on s- eral objects and phenomena where white dwarf stars play a key role. T Type Ia supernovae have been used as evidence to show that, in fact, Einstein did not make his greatest blunder when heallowedfor the possibility of a c- mological constant. Improvements in our knowledge of the Hubble parameter have revived interest in the use of white dwarf stars as a different typeofc- mochronometer to measuretheage of the Galaxy andthus set constraints on the age of the Universe. In roughly the same time period, there have been considerable advances in our understanding of white dwarf stars, both as i- lated stars in the ?eld and as members ofinteracting binary systems. Much of thisadvance has come from theavailabilityof spacecraftobservations from missions like HST T T, IU UE, ROSAT T, EXOSAT T, Chandra, ORFEUS, EUVE, HUT T T, and FUSE. The discovery of thousandsof new white dwarfs from a number oflarge surveys and thepotential of theSloan Digital SkySurvey have added impetus to the ?eld. Studies ofinteracting binaries such as classical novae, supersoft X-ray bi- ries, symbiotic variables, dwarf novae and nova-like objects have revealed the diff ferences between thethermal evolution of singleand close binary systems aswell as heightenedinterest in these systems as progenitors of the cosmol- ically important Type I supernovae. A more speculative question is whether classical novae can beunderstood well enough that theymight provide another kind of standard candle.
At the beginning of the 20th century, Kristian Birkeland (1867-1917), a Norwegian scientist of insatiable curiosity, addressed questions that had vexed European scientists for centuries. Why do the northern lights appear overhead when the earth's magnetic field is disturbed? How are magnetic storms connected to disturbances on the sun? To answer these questions Birkeland interpreted his advance laboratory simulations and daring campaigns in the Arctic wilderness in the light of Maxwell's newly discovered laws of electricity and magnetism. Birkeland's ideas were dismissed for decades, only to be vindicated when satellites could fly above the earth's atmosphere.
This volume documents recent developments that have advanced our understanding of the heating and cooling mechanisms in galaxies and galaxy clusters. Chapters detail results from multi-wavelength observations and advances in numerical hydrodynamical simulations. An additional section covers new research findings on feedback and self-regulatory mechanisms during cosmic structure formation in general and in galaxy formation in particular.
The present volume gathers together the talks presented at the second colloquim on the Future Professional Communication in Astronomy (FPCA II), held at Harvard University (Cambridge, MA) on 13-14 April 2010. This meeting provided a forum for editors, publishers, scientists, librarians and officers of learned societies to discuss the future of the field. The program included talks from leading researchers and practitioners and drew a crowd of approximately 50 attendees from 10 countries. These proceedings contain contributions from invited and contributed talks from leaders in the field, touching on a number of topics. Among them: - The role of disciplinary repositories such as ADS and arXiv in astronomy and the physical sciences; - Current status and future of Open Access Publishing models and their impact on astronomy and astrophysics publishing; - Emerging trends in scientific article publishing: semantic annotations, multimedia content, links to data products hosted by astrophysics archives; - Novel approaches to the evaluation of facilities and projects based on bibliometric indicators; - Impact of Government mandates, Privacy laws, and Intellectual Property Rights on the evolving digital publishing environment in astronomy; - Communicating astronomy to the public: the experience of the International Year of Astronomy 2009.
Comets are small bodies, but of great cosmic relevance. Given its pristine nature, they may preserve valuable and unique information on thechemical and physical processes that took place in theearly solar system, and that may be occurring in the formation of other planetary systems. They might have even played a very important role in the origin of life on Earth. Beyond that, since ancient times comets have inspired awe, superstition, and also curiosity anddebate. Their sudden apparitions challenged the long-held view of the immutability of the heavens, which triggered a long debate on whether comets had a heavenly or terrestrial nature. Therefore, comets have a prominent role in the history of scienti?cthought, that goes back to the most ancient civilizations. The last apparition of comet Halley in 1986 was a landmark since it arouse a great expectation in the scienti?c community and in the public at large. For the ?rst time, a ?otilla of spacecrafts visited a comet. Agreat number of popular and technical books were written on Halley, and comets in general, around the mid-eighties. The interest in comets never subsided after Halley's passage which is re?ected in the large volume of printed material on these bodies. I have taken the challenge to write a new book on comets that summarizes most of the recent advances on thesubject, including my own workdeveloped during the last 25 years.
This book contains the latest results on the plasma environment of Mars and its interaction with the solar wind. These results include mapping of the plasma environment with the instruments on Mars Express and Mars Global Surveyor, the latest numerical simulations, and theoretical studies. This comprehensive examination of the Mars environment also sets the stage for the interpretation of the Venus Express measurements that are now becoming available.
Careers in astronomy for women (as in other sciences) were a rarity in Britain and Ireland until well into the twentieth century. The book investigates the place of women in astronomy before that era, recounted in the form of biographies of about 25 women born between 1650 and 1900 who in varying capacities contributed to its progress during the eighteenth, nineteenth and early twentieth centuries. There are some famous names among them whose biographies have been written before now, there are others who have received less than their due recognition while many more occupied inconspicuous and sometimes thankless places as assistants to male family members. All deserve to be remembered as interesting individuals in an earlier opportunity-poor age. Placed in roughly chronological order, their lives constitute a sample thread in the story of female entry into the male world of science. The book is aimed at astronomers, amateur astronomers, historians of science, and promoters of women in science, but being written in non-technical language it is intended to be of interest also to educated readers generally.
Supernovae, hypernovae and gamma-ray bursts are among the most
energetic explosions in the universe. The light from these
outbursts is, for a brief time, comparable to billions of stars and
can outshine the host galaxy within which the explosions reside.
Most of the heavy elements in the universe are formed within these
energetic explosions. Surprisingly enough, the collapse of massive
stars is the primary source of not just one, but all three of these
explosions.
The reconfiguration and relinquishing of one's conviction in a world system long held to be finite required for many in the sixteenth and seventeenth centuries a compromise in one's beliefs and the biblical authority on which he or she had relied - and this did not come without serious and complex challenges. Advances in astronomy, such as the theories of Copernicus, the development of the telescope, and Galileo's discoveries and descriptions of the moon sparked intense debate in Early Modern literary discourse. The essays in this collection demonstrate that this discourse not only stimulated international discussion about lunar voyages and otherworldly habitation, but it also developed a political context in which these new discoveries and theories could correspond metaphorically to New World exploration and colonization, to socio-political unrest, and even to kingship and regicide.
This thesis describes one of the most precise experimental tests of Lorentz symmetry in electrodynamics by light-speed anisotropy measurement with an asymmetric optical ring cavity. The author aims to answer the fundamental, hypothetical debate on Lorentz symmetry in the Universe. He concludes that the symmetry is protected within an error of 10-15, which means providing one of the most stringent upper limits on the violation of the Lorentz symmetry in the framework of the Standard Model Extension. It introduces the following three keys which play an important role in achieving high-precision measurement: (1) a high-index element (silicon) interpolated into part of the light paths in the optical ring cavity, which improves sensitivity to the violation of the Lorentz symmetry, (2) double-pass configuration of the interferometer, which suppresses environmental noises, and (3) continuous data acquisition by rotating the optical ring cavity, which makes it possible to search for higher-order violations of Lorentz symmetry. In addition to those well-described keys, a comprehensive summary from theoretical formulations to experimental design details, data acquisition, and data analysis helps the reader follow up the experiments precisely.
During the past several years, research teams around the world have developed astrophysics-relevant utilizing high energy-density facilities such as intense lasers and z-pinches. Research is underway in many areas, such as compressible hydrodynamic mixing, strong shock phenomena, radiation flow, radiative shocks and jets, complex opacities, equations of stat, and relativistic plasmas. Beyond this current research and the papers it is producing, plans are being made for the application, to astrophysics-relevant research, of the 2 MJ National Ignition Facility (NIF) laser at Lawrence Livermore National Laboratory; the 600 kj Ligne d'Integration Laser (LIL) and the 2 MJ Laser Megajoule (LMJ) in Bordeaux, France; petawatt-range lasers now under construction around the world; and current and future Z pinches. The goal of this conference and these proceedings is to continue focusing attention on this emerging research area. The conference brought together different scientists interested in this emerging new field, with topics covering: - Hydrodynamic instabilities in astrophysics, - Supernovae and supernova remnant evolution, - Astrophysical shocks, blast waves, and jets, - Stellar opacities, - Radiation and thermal transport, - Dense plasma atomic physics and EOS, - X-ray photoionized plasmas, - Ultrastrong magnetic field generation.
This book provides readers with the results of recent research from some of the world's leading historians of astronomy on aspects of Arabic, Australian, Chinese, Japanese, and North and South American astronomy and astrophysics. It contains peer-reviewed papers gathered from the International Conferences on Oriental Astronomy 6 (ICO-6) with the chosen theme of "Highlighting the History of Astronomy in the Asia-Pacific Region." Of particular note are the sections on Arabic astronomy, Asian applied astronomy and the history of Australian radio astronomy, and the chapter on Peruvian astronomy. This title is a valuable complement for those with research interests in applied historical astronomy; archaeoastronomy; calendars, manuscripts, and star charts; historical instruments and observatories, and the history of radio astronomy.
This biography summarizes the seminal contributions to auroral and space science of Carl Stormer (1874 - 1957). He was the first to develop precise photographic methods to calculate heights and morphologies of diverse auroral forms during four solar cycles. Stormer independently devised numerical techniques to determine the trajectories of high-energy charged particles allowed and forbidden in the Earth's magnetic field. His theoretical analyses explained cosmic ray access to the upper atmosphere, 20 years before they were identified by other scientists. Stormer's crowning achievement, "The Polar Aurora," published when he was 81 years old, stands to this day as a regularly cited guide in graduate-level courses on space physics. The authors present the life of this prodigious scientist in relation to the cultural life of early 20th century in Norway and to the development of the space sciences in the post-Sputnik era.
Hardbound. The proceedings of this workshop focus on recent developments in and research on heavy ion collisions. Furthermore it covers the physics which can be carried out by radioactive beams and with heavy ion storage rings. It contains review articles which examine in depth the latest research results and presents a state-of-art view of this fast exanding field. All the chapters are written by leading experts active in the field today.
In Shakespeare and the Dawn of Modern Science, renowned astronomy expert Peter Usher expands upon his allegorical interpretation of Hamlet and analyzes four more plays, Love's Labour's Lost, Cymbeline, The Merchant of Venice, and The Winter's Tale. With painstaking thoroughness, he dissects the plays and reveals that, contrary to current belief, Shakespeare was well aware of the scientific revolutions of his time. Moreover, Shakespeare imbeds in the allegorical subtext information on the appearances of the Sun, Moon, planets, and stars that he could not have known without telescopic aid, yet these plays appeared coeval with or prior to the commonly accepted date of 1610 for the invention and first use of the astronomical telescope. Dr. Usher argues that an early telescope, the so-called perspective glass, was the likely means for the acquisition of these data. This device was invented by the mathematician Leonard Digges, whose grandson of the same name contributed poems to the First and Second Folio editions of Shakespeare's plays. Shakespeare and the Dawn of Modern Science is an important addition to literature, history, and science collections as well as to personal libraries. |
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