This textbook provides an introduction to string field theory (SFT). String theory is usually formulated in the worldsheet formalism, which describes a single string (first-quantization). While this approach is intuitive and could be pushed far due to the exceptional properties of two-dimensional theories, it becomes cumbersome for some questions or even fails at a more fundamental level. These motivations have led to the development of SFT, a description of string theory using the field theory formalism (second-quantization). As a field theory, SFT provides a rigorous and constructive formulation of string theory. The main focus of the book is the construction of the closed bosonic SFT. The accent is put on providing the reader with the foundations, conceptual understanding and intuition of what SFT is. After reading this book, the reader is able to study the applications from the literature. The book is organized in two parts. The first part reviews the notions of the worldsheet theory that are necessary to build SFT (worldsheet path integral, CFT and BRST quantization). The second part starts by introducing general concepts of SFT from the BRST quantization. Then, it introduces off-shell string amplitudes before providing a Feynman diagrams interpretation from which the building blocks of SFT are extracted. After constructing the closed SFT, the author outlines the proofs of several important properties such as background independence, unitarity and crossing symmetry. Finally, the generalization to the superstring is also discussed.
Brazil’s soft power path to major power status. The largest country in South America by land mass and population, Brazil has been marked since its independence by a belief that it has the potential to play a major role on the global stage. Set apart from the rest of the hemisphere by culture, language, and history, Brazil has also been viewed by its neighbors as a potential great power and, at times, a threat. But even though domestic aspirations and foreign perceptions have held out the prospect for Brazil becoming a major power, the country has lacked the capabilities—particularly on the military and economic dimensions—to pursue a traditional path to greatness. Aspirational Power examines Brazil as an emerging power. It explains Brazil’s present emphasis on using soft power through a historical analysis of Brazil’s three past attempts to achieve major power status. Though these efforts have fallen short, this book suggests that Brazil will continue to try to emerge, but that it will only succeed when its domestic institutions provide a solid and attractive foundation for the deployment of its soft power abroad. Aspirational Power concludes with concrete recommendations for how Brazil might improve its strategy, and why the great powers, including the United States, should respond positively to Brazil’s emergence.
Thermodynamics of Certain Refractory Compounds, Volume I: Discussion of Theoretical Studies provides information pertinent to thermodynamics as a significant theoretical tool for predicting the chemical and physical behavior of materials under diverse environmental conditions. This book presents a summary of the methods used to analyze thermodynamic data. Organized into six chapters, this volume begins with an overview of the thermodynamic properties that have been obtained for a selected group of refractory compounds in the range from 0° to 6000°K. This text then examines the class of compounds, including the borides, oxides, carbides, and nitrides of some elements in groups IIA, IIIB, IVB, VB, VIB, VIIB, and VIII as well as some elements from the rare-earth and actinide series. Other chapters consider the need for standardization in methods of obtaining and presenting thermodynamic data. The final chapter deals with the recommendations for the advancement of work. This book is a valuable resource for scientists and engineers.
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