Astrofysik

Numerous times throughout Earth's history there have been major cataclysmic events. These events have resulted in large-scale climactic changes, mythological stories of floods and visitations from the skies, and sometimes the complete extinction of life. The major planetary body that has caused much of this carnage has been referred to by many names. Jason Breshears has termed it Phoenix, based on his research into the distant past and what it was usually called by witnesses. By piecing together ancient documents from the most reputable sources available, we have, in this book, the most extensive and accurate rendering of the cycle of the Phoenix, including when it will come again. Some of us, according to the author, will live to see its return. Beyond the foundational scientific evidence, the author ties in various Bible prophecies that relate directly to it. Many books exist on this subject, but few have broken new ground like this one, due to the extensive research involved.

This thesis addresses the feasibility of the production of ultra-high-energy cosmic rays in starburst galaxies and active galactic nuclei. These astrophysical objects were theoretically proposed as candidate sources a long time ago. Nevertheless, the interest in them has been recently renewed due to the observational data collected by the Pierre Auger Observatory and the Telescope Array. In this work, a comprehensive review of the current status of the research on cosmic rays accelerators is provided, along with a summary of the principal concepts needed to connect these relativistic particles with electromagnetic and neutrino observations in the multi-messenger era. On one hand, the hypothesis of accelerating particles with energies above 10' eV in starburst superwinds is carefully revisited, taking into account the constraints imposed by the most recent electromagnetic observations. On the other hand, an alternative new model for the gamma emission of the nearby active galaxy NGC 1068 is presented. The implications of the results of these studies are discussed in terms of the contemporary observatories and prospects for future experiments are offered.

**AS SEEN ON BBC BREAKFAST**Will we ever truly understand our cosmic home? This is the story of the technologies that allow us to look up, to learn and to discover our place in the cosmos.'An electrifying new history of the universe' HANNAH FRY, author of Rutherford and Fry's Complete Guide to Absolutely EverythingWe are part of an incredible chain of events stretching 13.8 billion years into the past and even further into the future. But what does that future hold? And how do scientists study the entire universe?The Universe in a Box is Andrew Pontzen's tribute to simulations - the remarkable computer codes that, over the last century, have allowed us to grasp the distant past and far future of the universe. It reveals the stories of pioneering scientists who unlocked the mysteries of the cosmos, and reframes our understanding of galaxies, black holes and space itself.'I was enlightened, amazed, and profoundly impressed' SIR PHILIP PULLMAN, author of His Dark Materials'Compelling...a veritable treasure chest filled with captivating stories'SCIENCE

If existing models of the structure of the universe are correct, then 85 percent of the cosmos comprises a substance called dark matter. Yet no direct evidence of dark matter exists. Award-winning science journalist Govert Schilling details the quest to detect dark matter and how the search has helped us to understand the universe we inhabit.

'If you want to remember why you once fell in love with the idea of the cosmos, or want to fall in love with it for the first time, then this book is for you' ObserverFrom Carlo Rovelli, the bestselling author of Seven Brief Lessons on Physics, this is a story of wonder, new worlds and why the end is just the beginningLet us journey into the heart of a black hole. Let us slip beyond its boundary, the horizon, and tumble - on and on - down this crack in the universe. As we plunge, we'll see geometry fold, we'll feel the equations draw tight around us. Eventually, we'll pass it: the remains of a star, deep and dense and falling further far. And then - the bottom. Where time and space end, and the white hole is born . . .With lightness and magic, here Carlo Rovelli traces the ongoing adventure of his own cutting-edge research, of the uncertainty and joy of going where we've not yet been. Guiding us to the edge of theory and experiment, he invites us to go beyond, to experience the fever and the disquiet of science. Here is the extraordinary life of a white hole.A BOOK OF THE YEAR ACCORDING TO THE FINANCIAL TIMES * SUNDAY TELEGRAPH * NEW STATESMAN * NEW SCIENTIST

"Splinters of Infinity is set in a paradigm-shattering era of physics and science, as a series of rapid-fire discoveries and new ideas completely upend humanity's conception of the universe. Among these revolutions, America's two foremost physicists, Robert Millikan and Arthur Compton, find themselves locked in an intense, often deeply personal, conflict about cosmic rays, one of the era's most fascinating and puzzling discoveries: cosmic rays seemed to promise a path into the deepest heart of science, a chance to answer questions that might just explain everything -- or reveal the mind of God"--

Albert Einstein knew already in the early 1900s, when he first published his famous paper about the constancy of the speed of light, that not only did this constancy imply that mass contains energy (E = m c squared), but that faster-than-light motion could lead to paradoxes -- some that seemed to involve backwards time travel.What are these paradoxes? Why is light and its speed relevant? This book will lead you through an obstacle course of conundrums and oddities, building up your understanding of how light's speed creates simple but mind-expanding paradoxes -- one conceptual riddle at a time.This is not your average popular science book. This is also not a textbook. This book takes one theme -- the universally constant speed of light -- and shows how it may appear compromised on scales from the quantum mechanics of the very small to the cosmology of the very large, and the resulting surprising implications can result.

Multi-messenger science has a long history in solar astronomy, as direct measures of "in-situ" particles emanating from the Sun, like the solar wind, have long been used alongside remote observations to shape our understanding of the heliosphere. Still, the recent advent of several major observational facilities, such as Parker Solar Probe, Solar Orbiter, and the Inouye Solar Telescope, among many others, is now heralding an exciting new era of scientific opportunities within multi-messenger solar physics. This volume collects the proceedings of IAU Symposium 372 held during the XXXIst IAU General Assembly in Busan, Republic of Korea. Its main goal is to highlight how these facilities can address many of the pressing questions facing contemporary solar physics, with a special emphasis on their coordinated operation and the resulting synergies. Graduate students and researchers in solar physics will benefit from the many new results presented within.

Winds form an integral part of astronomy - from regulating rotation of stars through enriching galaxies with fresh materials. Outflowing winds persist during the entire lives of stars and play a key role in shaping the exoplanet demographics we observe. In massive stars, their winds are a vital ingredient of their evolution, from the main sequence to the pre-supernova stage, determining black hole masses as measured from gravitational waves. In the case of low-mass stars, their winds dictate rotational evolution, which affect angular momentum distribution within the stellar interior and thus the generation of magnetic fields. In the case of planets, winds take the form of atmospheric escape, which can strongly affect their atmospheric evolution. IAU Symposium 370 brings together researchers on winds of exoplanets and stars, including the solar wind, to share insights into the physics and modelling tools used by these different communities.

A graduate-level introduction to the interface between particle physics, astrophysics, and cosmologyThis book explores the exciting interface between the fields of cosmology, high-energy astrophysics, and particle physics, at a level suitable for advanced undergraduate- to graduate-level students as well as active researchers. Without assuming a strong background in particle physics or quantum field theory, the text is designed to be accessible to readers from a range of backgrounds and presents both fundamentals and modern topics in a modular style that allows for flexible use and easy reference. It offers coverage of general relativity and the Friedmann equations, early universe thermodynamics, recombination and the cosmic microwave background, Big Bang nucleosynthesis, the origin and detection of dark matter, the formation of large-scale structure, baryogenesis and leptogenesis, inflation, dark energy, cosmic rays, neutrino and gamma-ray astrophysics, supersymmetry, Grand Unified Theories, sterile neutrinos, and axions. The book also includes numerous worked examples and homework problems, many with solutions. Particle Cosmology and Astrophysics provides readers with an invaluable entrée to this cross-disciplinary area of research and discovery. Accessible to advanced undergraduate to graduate students, as well as researchers in cosmology, high-energy astrophysics, and particle physicsDoes not assume a strong background in particle physics or quantum field theory and contains two chapters specifically for readers with no background in particle physicsBroad scope, covering many topics across particle physics, astrophysics, and particle cosmologyModular presentation for easy reference and flexible useProvides more than 200 homework problems, many with solutionsIdeal for course use or self-study and reference

There is a huge gulf between the real physics of space travel and the way it is commonly portrayed in movies and TV shows. That¿s not because space physics is difficult or obscure ¿ most of the details were understood by the end of the 18th century ¿ but because it can often be bafflingly counter-intuitive for a general audience. The purpose of this book isn¿t to criticize or debunk popular sci-fi depictions, which can be very entertaining, but to focus on how space physics really works. This is done with the aid of numerous practical illustrations taken from the works of serious science fiction authors ¿ from Jules Verne and Arthur C. Clarke to Larry Niven and Andy Weir ¿ who have taken positive pleasure in getting their scientific facts right.

By the star physicist and author of multiple #1 Sunday Times bestsellers, a major and definitive narrative work on black holes and how they can help us understand the universe. At the heart of our galaxy lies a monster so deadly it can bend space, throwing vast jets of radiation millions of light years out into the cosmos. Its kind were the very first inhabitants of the universe, the black holes.Today, across the universe, at the heart of every galaxy, and dotted throughout, mature black holes are creating chaos. And in a quiet part of the universe, the Swift satellite has picked up evidence of a gruesome death caused by one of these dark powers. High energy X-ray flares shooting out from deep within the Draco constellation are thought to be the dying cries of a white dwarf star being ripped apart by the intense tides of a supermassive black hole ? heating it to millions of degrees as it is shredded at the event horizon.They have the power to wipe out any of the universe's other inhabitants, but no one has ever seen a black hole itself die. But 1.8 billion light years away, the LIGO instruments have recently detected something that could be the closest a black hole gets to death. Gravitational waves given off as two enormous black holes merge together. And now scientists think that these gravitational waves could be evidence of two black holes connecting to form a wormhole ? a link through space and time. It seems outlandish, but today's physicists are daring to think the unthinkable ? that black holes could connect us to another universe.At their very heart, black holes are also where Einstein's Theory of General Relativity is stretched in almost unimaginable ways, revealing black holes as the key to our understanding of the fundamentals of our universe and perhaps all other universes.Join Professors Brian Cox and Jeff Forshaw in exploring our universe's most mysterious inhabitants, how they are formed, why they are essential components of every galaxy, including our own, and what secrets they still hold, waiting to be discovered.

This book treats the subject of gravitational waves (GWs) production in binary stars or black-holes and in the early universe, using tools of quantum field theory which are familiar to graduate students and researchers in particle physics. A special focus is given to the generation of templates of gravitational wave signals from Feynman diagram calculations of transition amplitudes, which interests active researchers in GWs. The book presents field theory concepts, like supersymmetry realized in spinning binaries and soft-graviton theorems, that can have practical applications in novel GW signals, like the memory effect. The book also aims at specialists in both GWs and particle physics addressing cosmological models of phase transition and inflation that can be tested in observations at terrestrial and space based interferometers, pulsar timing arrays, and the cosmic microwave anisotropy observations.

This book discusses analytic and asymptotic methods relevant to radiative transfer in dilute media, such as stellar and planetary atmospheres.  Several methods, providing exact expressions for the radiation field in a semi-infinite atmosphere, are described in detail and applied to unpolarized and polarized continuous spectra and spectral lines. Among these methods, the Wiener-Hopf method, introduced in 1931 for a stellar atmospheric problem, is used today in fields such as solid mechanics, diffraction theory, or mathematical finance. Asymptotic analyses are carried out on unpolarized and polarized radiative transfer equations and on a discrete time random walk. Applicable when photons undergo a large number of scatterings, they provide criteria to distinguish between large-scale diffusive and non-diffusive behaviors, typical scales of variation of the radiation field, such as the thermalization length, and specific descriptions for regions close and far from boundaries. Its well organized synthetic view of exact and asymptotic methods of radiative transfer makes this book a valuable resource for both graduate students and professional scientists in astrophysics and beyond.

Nearly every school district has one. A place for teenagers to go to school after thetraditional high school determines there is nothing further they could do to bring youth withrisk factors across the finish line to graduation. Alternative Education; where those kids go toschool. The ones who learn differently, have attendance and/or behavioral issues, are behindfrom failing high school courses, pregnant, or have been bullied to the point of despair,impacting their ability to concentrate on learning and succeed in high school. Sometimesthese adolescents are stereotyped as the bad kids, and high school staff (not all) give up ontrying any longer to serve their needs.The stigma or stereotyping of alternative education students is an issue of social justice.

"An eye-opening account of the inexplicable phenomena that science has only recently glimpsed, and that could transform our understanding of the fundamental nature of reality"--

The thesis tackles two distinct problems of great interest in gravitational mechanics ¿ one relativistic and one Newtonian. The relativistic one is concerned with the "first law of binary mechanics", a remarkably simple variational relation that plays a crucial role in the modern understanding of the gravitational two-body problem, thereby contributing to the effort to detect gravitational-wave signals from binary systems of black holes and neutron stars. The work reported in the thesis provides a mathematically elegant extension of previous results to compact objects that carry spin angular momentum and quadrupolar deformations, which more accurately represent astrophysical bodies than mere point particles. The Newtonian problem is concerned with the isochrone problem of celestial mechanics, namely the determination of the set of radial potentials whose bounded orbits have a radial period independent of the angular momentum. The thesis solves this problem completely ina geometrical way and explores its consequence on a variety of levels, in particular with a complete characterisation of isochrone orbits. The thesis is exceptional in the breadth of its scope and achievements. It is clearly and eloquently written, makes excellent use of images, provides careful explanations of the concepts and calculations, and it conveys the author¿s personality in a way that is rare in scientific writing, while never sacrificing academic rigor.

"Yes, the Universe is beautiful. And, despite all our scientific progress, it's still pretty mysterious. But you know what? The Universe is also kind of an asshole. Consider that you are just a group of atoms structured in a specific way that you can try to understand this thing we call existence. Those same atoms could have just as easily been used to make the dog shit you are cleaning off your shoes. The fact is, when you zoom out and look at the Universe and how it functions, you'll see that it's usually not in our favor. Many of the laws of physics are just kind of--dick-ish. In this book, you'll discover why: You're an aging mutant. Most water will kill you. The Universe could be deleted any second. And 39 more reasons to hate the Universe--along with the one reason we have to love it despite all the shit it throws our way"--

This book provides a complete overview of the development of cosmic ray physics, with historical and educational considerations, from early evidence of the existence of extraterrestrial radiation up to the most recent applications of cosmic ray muons in different aspects of daily life.Many of the original results that contributed to the study of cosmic radiation are presented and discussed, accompanied by bibliographic references, numerous in-depth appendices, about 200 illustrations and a large chapter dedicated to the overall impact of cosmic rays.The book includes sections on, among other topics: the debate on the corpuscular or radiative nature of cosmic radiation; the development of early techniques for detecting cosmic particles; the properties and composition of primary and secondary radiation; and the interaction of cosmic muons in matter and a long list of their recent applications, ranging from the muon tomography techniques to the investigation of the stability of civil buildings. The book is addressed to a wide audience, and thus, while it is used for introductory cosmic ray physics courses at the bachelor's or master's level, high school students and teachers involved in educational projects around cosmic rays also benefit from its many historical and educational aspects.

From the scientific origins of the search for intelligent life, to UFOs and conspiracy theories, to the very people who know how and where to look today, this book is packed full of theories, ideas, and examples of everything we know and don't about aliens.

"This book tells the stories of women physicists from around the world who transformed science. Many of them discovered invisible objects in the universe, and all wore a cloak of invisibility throughout their careers. Their remarkable stories of scientific innovation, inspirational leadership and overcoming invisibility deserve to go viral"--

Das Werk erkundet das Leben Galileis, Keplers und Marius und die zeitgenössischen Umstände, die ihre außergewöhnlichen Errungenschaften beeinflusst haben. Es verfolgt ihre gemeinsamen und gegenläufigen Spuren und setzt sie in Beziehung zu den Weltbildern sowohl der Antike als auch den Erkenntnissen heutiger moderner Kosmologie. Biografische Notizen erzählen von parallelen Lebensphasen und deren Verschränkungen dieser drei berühmten Wissenschaftler, die durch ihre Entdeckungen überkommene Weltbilder in Frage stellten, neue Weltbilder an der Schwelle zur Neuzeit initiierten, und dadurch Konflikte mit den herrschenden Autoritäten provozierten. Wichtige Entwicklungen, wie Experimente, mechanistische Weltbilder, die Erfindung von Instrumenten und Prioritätenstreit werden thematisch zusammengefasst. Aber auch deren Weltbilder bestehen bis heute in ihrer ursprünglichen Form nicht mehr weiter, wenn Gewissheiten durch Wahrscheinlichkeiten ersetzt werden, und Raum und Zeit ihre Absolutheit verlieren.