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.
Situated in a spectacular basin surrounded by 13,000-foot peaks, the city of Ouray has captured the eye of adventurers from its beginnings, while the glitter of gold and silver brought prospectors to its mountains. The Uncompahgre Utes hunted and soaked in their sacred hot springs for generations, but about one year after Chief Ouray's death, they were removed from their homelands to a reservation in Utah. Mines and mining camps proliferated in the harsh, remote high country, where rugged terrain hampered the transportation of ore and supplies, even after toll roads and railroads lessened isolation. Ouray (pronounced "Yurr-AY") developed into a Victorian community with families, churches, and schools contrasted with rowdy saloons and so-called "fancy ladies." Ouray further embraced tourism after mining waned, and heritage preservation remains an ongoing concern.
The 253 works in the exhibition, many of them rare or unique and all of exceptional print quality, have been culled from the more than five thousand that comprise the legendary but seldom exhibited Gilman Paper Company Collection, the most important private collection of photographs in the world.
Reprint of the original, first published in 1871. The publishing house Anatiposi publishes historical books as reprints. Due to their age, these books may have missing pages or inferior quality. Our aim is to preserve these books and make them available to the public so that they do not get lost.
This volume of the Sports She Wrote series completes the nine-volume chronological journey of 19th century cycling articles written by women. By the end of the century, the bicycling craze transitioned from a fleeting fad into a deeply ingrained aspect of American culture. Bicycles were no longer mere novelties but essential methods of transportation for the masses, sources of physical exercise, and vehicles for leisure and sports. Forty-eight articles (102,000 words) authored by dozens of women writers and 38 illustrations from 20 periodicals offer insightful discourse on the state and development of women’s cycling. These articles offer a multifaceted exploration of various cycling topics, reflecting the evolving attitudes and practices surrounding the sport. The final cycling article, published in 1900, is emblematic of the progress made and the future prospect for athletic cycling, focusing on women’s “fancy riding,” now known as trick riding. This volume includes the comprehensive book “Bicycling for Ladies,” written by Maria E. Ward, published in 1896. With 34 accompanying photographs, Ward's book serves as a testament to the vibrancy and diversity of cycling culture during this pivotal period in history. In addition to the basics of riding, Ward provides detailed instructions for maintenance and repair of bicycles and demonstrates how to use the necessary tools that many women of the era were unaccustomed to using. The volume concludes with a foretaste of the future penned by Mary Sargent Hopkins, whose cycling articles are featured in several volumes of this series, but in this case introduces readers to a new wheeled contraption destined to revolutionize independent transportation—the automobile. Sports She Wrote is a 31-volume time-capsule of primary documents written by more than 500 women in the 19th century, including nine volumes on cycling.
Gotham Book Finalist 2024 NPR Science Friday Best Summer Beach Reads 2024 Winner of the Christopher Award 2024 New York City, 1929. A sanatorium, a deadly disease, and a dire nursing shortage. In the pre-antibiotic days when tuberculosis stirred people’s darkest fears, killing one in seven, white nurses at Sea View, New York’s largest municipal hospital, began quitting en masse. Desperate to avert a public health crisis, city officials summoned Black southern nurses, luring them with promises of good pay, a career, and an escape from the strictures of Jim Crow. But after arriving, they found themselves on an isolated hilltop in the remote borough of Staten Island, yet again confronting racism and consigned to a woefully understaffed sanatorium, dubbed “the pest house,” where it was said that “no one left alive.” Spanning the Great Depression and moving through World War II and beyond, this remarkable true story follows the intrepid young women known by their patients as the “Black Angels.” For twenty years, they risked their lives working under appalling conditions while caring for New York’s poorest residents, who languished in wards, waiting to die, or became guinea pigs for experimental surgeries and often deadly drugs. But despite their major role in desegregating the New York City hospital system—and their vital work in helping to find the cure for tuberculosis at Sea View—these nurses were completely erased from history. The Black Angels recovers the voices of these extraordinary women and puts them at the center of this riveting story, celebrating their legacy and spirit of survival.
Dr. Ailie Gale was one of many twentieth-century women missionaries in China whose letters to supporters played an important role in American conceptions of a special Sino-American friendship. This book shows how these letters from China reveal as much about the strivings of readers at home as they do about China during the tumultuous period from 1911 to 1949.
This book reflects our own struggle to understand the semiclassical behaviour of quantized fields in the presence of boundaries. Along many years, motivated by the problems of quantum cosmology and quantum field theory, we have studied in detail the one-loop properties of massless spin-l/2 fields, Euclidean Maxwell the ory, gravitino potentials and Euclidean quantum gravity. Hence our book begins with a review of the physical and mathematical motivations for studying physical theories in the presence of boundaries, with emphasis on electrostatics, vacuum v Maxwell theory and quantum cosmology. We then study the Feynman propagator in Minkowski space-time and in curved space-time. In the latter case, the corre sponding Schwinger-DeWitt asymptotic expansion is given. The following chapters are devoted to the standard theory of the effective action and the geometric im provement due to Vilkovisky, the manifestly covariant quantization of gauge fields, zeta-function regularization in mathematics and in quantum field theory, and the problem of boundary conditions in one-loop quantum theory. For this purpose, we study in detail Dirichlet, Neumann and Robin boundary conditions for scalar fields, local and non-local boundary conditions for massless spin-l/2 fields, mixed boundary conditions for gauge fields and gravitation. This is the content of Part I. Part II presents our investigations of Euclidean Maxwell theory, simple super gravity and Euclidean quantum gravity.
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