Einstein's energy-momentum relation is applicable to particles of all speeds, including the particle at rest and the massless particle moving with the speed of light. If one formula or formalism is applicable to all speeds, we say it is 'Lorentz-covariant.' As for the internal space-time symmetries, there does not appear to be a clear way to approach this problem. For a particle at rest, there are three spin degrees of freedom. For a massless particle, there are helicity and gauge degrees of freedom. The aim of this book is to present one Lorentz-covariant picture of these two different space-time symmetries. Using the same mathematical tool, it is possible to give a Lorentz-covariant picture of Gell-Mann's quark model for the proton at rest and Feynman's parton model for the fast-moving proton. The mathematical formalism for these aspects of the Lorentz covariance is based on two-by-two matrices and harmonic oscillators which serve as two basic scientific languages for many different branches of physics. It is pointed out that the formalism presented in this book is applicable to various aspects of optical sciences of current interest.
This book covers the theory and applications of the Wigner phase space distribution function and its symmetry properties. The book explains why the phase space picture of quantum mechanics is needed, in addition to the conventional Schrödinger or Heisenberg picture. It is shown that the uncertainty relation can be represented more accurately in this picture. In addition, the phase space picture is shown to be the natural representation of quantum mechanics for modern optics and relativistic quantum mechanics of extended objects.
Special relativity and quantum mechanics, formulated early in the twentieth century, are the two most important scientific languages and are likely to remain so for many years to come. In the 1920's, when quantum mechanics was developed, the most pressing theoretical problem was how to make it consistent with special relativity. In the 1980's, this is still the most pressing problem. The only difference is that the situation is more urgent now than before, because of the significant quantity of experimental data which need to be explained in terms of both quantum mechanics and special relativity. In unifying the concepts and algorithms of quantum mechanics and special relativity, it is important to realize that the underlying scientific language for both disciplines is that of group theory. The role of group theory in quantum mechanics is well known. The same is true for special relativity. Therefore, the most effective approach to the problem of unifying these two important theories is to develop a group theory which can accommodate both special relativity and quantum mechanics. As is well known, Eugene P. Wigner is one of the pioneers in developing group theoretical approaches to relativistic quantum mechanics. His 1939 paper on the inhomogeneous Lorentz group laid the foundation for this important research line. It is generally agreed that this paper was somewhat ahead of its time in 1939, and that contemporary physicists must continue to make real efforts to appreciate fully the content of this classic work.
North Korea has traditionally been seen as militarily superior to South Korea in the long feud between the two nations. This brilliantly argued book taps into a great deal of news interest in North Korea at the moment in the wake of recent hostility against Japan. Hamm controversially shows that the received idea of Koreas military strength is partly a myth created by South Korea to justify a huge programme of rearmament.
Featuring contributions by some of the leading experts in Korean studies, this book examines the political content of Kim Jong-Il's regime maintenance, including both the domestic strategy for regime survival and North Korea's foreign relations with South Korea, Russia, China, Japan, and the United States. It considers how and why the Democratic People's Republic of Korea (DPRK) became a "hermit kingdom" in the name of Juche (self-reliance) ideology, and the potential for the barriers of isolationism to endure. This up-to-date analysis of the DPRK's domestic and external policy linkages also includes a discussion of the ongoing North Korean nuclear standoff in the region.
KOREA AND THE IMPERIALISTS Until the Korean War in 1950, except for evangelist Christian missionaries, Americans were not interested in Korea or considered it important in the scheme of things. Many did not know Korea had existed as an independent kingdom for centuries and others thought Korea might be a part of China or Japan. Nationalism, geopolitics, and imperialism were the major determinants of international events in the late nineteenth and early twentieth century. Greed and racism were the prime motivators of imperialism and non-White societies of the world were the victims. Korea was one of many countries that was invaded and made a "sphere of influence." With the support of America and Britain, Japan destroyed Korea's traditional national identity and made Korea a colony in the Japanese Empire. It was the perfect example of how imperialism profoundly affected the social, economic, and political life of countries subjugated by imperialist powers. After World War II, Korea was not granted independence because the Americans did not believe Koreans were capable of self-government. Korea was divided into two military occupation zones, resulting in the creation of a Russian and an American satellite state. In an effort to unite Korea, North Korea invaded South Korea. The U.S., China, and the two Korean states fought a meaningless war and Korea remains divided. Who are the Koreans? Why are there two Koreas? What is Korea's national identity? What role does imperialism and racism play in the destruction of national identities? Hopefully, this brief history of Korea and the Imperialists will provide some answers.
Marginality proposes a framework that justifies and undergirds development of contextual theologies without becoming itself dominating. Jung Young Lee aims to address the dilemmas of contextual theology, not by moving one or another group from the margin to the center, but by redefining marginality itself as central.
During the Cold War era, Korea's security agenda was defined largely by superpower rivalry. The goal of U.S. strategy, as reflected in the Truman Doctrine, was to stem the tide of communist expansionism and contain Soviet power within the USSR's existing borders. Korea was cast as a crucial buffer and fulcrum in the balance of power among the major powers surrounding the peninsula, and North Korea's invasion in 1950 of its southern neighbor was seen as a key test of containment policy.Now that the Cold War is over, it is time to reconsider the Korean peninsula's strategic role in global and regional politics. In this book, leading scholars provide new perspectives on Korea's changing role in the new world order. What are the implications of the dramatic end of the Cold War for East Asia and the Korean peninsula? Will peace and prosperity return to the region, followed by the reunification of divided Korea? Or will history repeat itself in the form of violent conflict and rivalry, as in late nineteenth- and early twentieth-century East Asia? The contributors consider these questions in the context of major powers' policies toward the Korean peninsula, inter-Korean relations, and revived prospects for Korean reunification.
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