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In this book, the author, by taking into account also the contribution of the gravitational potential energy to the determination of the gravitational masses of the particles in a gravitational field (contrary to the erroneous common use), finds that for the particles with rest mass greater than zero there is always an escape velocity (less than the velocity of light in vacuum c) from any gravitational field and that the particles with rest mass equal to zero are always free to go away from any gravitational field. Consequently, there is not any event horizon, and therefore there is not any black hole. Moreover, the author also shows that the presence of an event horizon would imply the violation of the principle of conservation of energy. In particular, all this is confirmed also by the symmetry with respect to time of the Einstein’s field equation of the General Theory of Relativity and by the correct solutions of this same equation. Consequently, this book can be useful also for explaining in a linear way the possibility of the Big Bang and the possibility of a cyclic universe. Finally, the experimental results are compatible so far with this book.
Frederik Pohl was on a streak when this Hugo Award–finalist novel was published in 1980. Now back in print after an absence of nearly a decade, this unique science fiction novel is as fresh and entertaining as ever. The story begins when the hero of Gateway finances an expedition to a distant alien spaceship that may end famine forever. On the ship, the explorers find a human boy, and evidence that reveals a powerful alien civilization is thriving on a transport ship headed right for Earth.... At the Publisher's request, this title is being sold without Digital Rights Management Software (DRM) applied.
A science fiction novel about a spaceship that has wandering in space for many years.
In this book the author, by starting from the Einstein’s field equation of the General Theory of Relativity, corrects the Schwarzschild solution, and shows that, in the correct Schwarzschild solution, there is not any event horizon and therefore there is not any black hole. Moreover, the author extends all this to its direct consequences, in particular correcting the Kerr solution, the Reissner-Nordstrøm solution and the Kerr-Newman solution. Then, the author extends these four correct solutions (of Schwarzschild, of Kerr, of Reissner-Nordstrøm and of Kerr-Newman) also to the case in which the cosmological constant is greater than zero. On the other hand, the author, by starting from the general form of the Einstein’s field equation of the General Theory of Relativity, demonstrates also in general the non-existence of any event horizon, and therefore the non-existence of any black hole, in the field of application of the General Theory of Relativity. Finally, the author also explores the consequences of all this on the entropy of the Universe, on the Hawking emission process, on the Big Bang Theory and on the astronomical observations.
In an age where Silicon Valley dictates what it means to innovate a painless future, knowledge and enjoyment are fertile breeding grounds of political contestation. But it’s not exactly democracy. We are controlled through platforms that turn us into data for the profit of billionaires. Control has become so playful that we carry it in our pockets, as we continue to crave likes and followers. What is to be done? Should the Left continue to cling to the promise of a political Event, patiently waiting for a revolutionary rupture where new possibilities emerge? Is there a way to delineate its horizons amidst the chaos? Through a psychoanalytic interrogation of the intersections of online culture, sexuality, and politics, Bonni Rambatan and Jacob Johanssen explore such horizons at the limits of capitalism. Event Horizon examines how capitalist ideology functions in our current moment, and, more importantly, how it breaks down. With the increasing urgency of formulating a proper Leftist response to the rapidly growing violence that seriously threatens the lives of marginalised communities, this book could not be more timely.
From the acclaimed author of Black Hole Blues and Other Songs from Outer Space—an authoritative and accessible guide to the most alluring and challenging phenomena of contemporary science. "[Levin will] take you on a safe black hole trip, an exciting travel story enjoyed from your chair’s event horizon.” —Boston Globe Through her writing, astrophysicist Janna Levin has focused on making the science she studies not just comprehensible but also, and perhaps more important, intriguing to the nonscientist. In this book, she helps us to understand and find delight in the black hole—perhaps the most opaque theoretical construct ever imagined by physicists—illustrated with original artwork by American painter and photographer Lia Halloran. Levin takes us on an evocative exploration of black holes, provoking us to imagine the visceral experience of a black hole encounter. She reveals the influence of black holes as they populate the universe, sculpt galaxies, and even infuse the whole expanse of reality that we inhabit. Lively, engaging, and utterly unique, Black Hole Survival Guide is not just informative—it is, as well, a wonderful read from first to last.
Tim Slater and Roger Freedman have worked to improve astronomy and overall science education for many years. Now, they’ve partnered to create a new textbook, a re-envisioning of the course, focused on conceptual understanding and inquiry-based learning. Investigating Astronomy: A Conceptual Approach to the Universe is a brief, 15-chapter text that employs a variety of activities and experiences to encourage students to think like a scientist.
"This book is composed of two parts: First part describes basics in numerical relativity, that is, the formulations and methods for a solution of Einstein's equation and general relativistic matter field equations. This part will be helpful for beginners of numerical relativity who would like to understand the content of numerical relativity and its background. The second part focuses on the application of numerical relativity. A wide variety of scientific numerical results are introduced focusing in particular on the merger of binary neutron stars and black holes."--
Discovering the Universe is the bestselling brief text for descriptive one-term astronomy courses (especially those with no mathematics prerequisites). Carried along by the book's vibrant main theme, "the process of scientific discovery," the Ninth Edition furthers the book’s legacy for presenting concepts clearly and accurately while providing all the pedagogical tools to make the learning process memorable.
A journey into Einstein's world of gravity and its captivating objects: black holes, neutron stars, and gravitational waves.