Search for dissertations about: "Sigma Models"
Showing result 21 - 25 of 30 swedish dissertations containing the words Sigma Models.
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21. Microelectronics for the thumb-size ultrasound measurement system
Abstract : This thesis presents building blocks and strategies to reach the goal of a thumb-size autonomous ultrasound measurement system with wireless communication capabilities. The design of modern electronics is based on the possibility to accurately predict system behavior by the use of simulation tools. READ MORE
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22. Dualities, Symmetries and Unbroken Phases in String Theory : Probing the Composite Nature of the String
Abstract : The thesis treats aspects of string/M-theory in anti-de Sitter spacetimes and their supersymmetric completions. By applying the AdS/CFT correspondence, as well as models of spin chains and singletons, we try to attain a better understanding of the underlying symmetries and the unbroken phases of string/M-theory. READ MORE
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23. Quivers, superconformal field theories and higher symmetries
Abstract : Quantum field theory (QFT) currently provides our best description of the natural world. Over the past century, it has been able to accurately reproduce many experimental results to an astonishing degree of accuracy and predict the existence of new particles. Despite this, QFT suffers from several mathematical problems. READ MORE
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24. Superconformal D-branes and moduli spaces
Abstract : The on-going quest for a single theory that describes all the forces of nature has led to the discovery of string theory. This is the only known theory that successfully unifies gravity with the electroweak and strong forces. READ MORE
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25. Studies on CMOS Digital-to-Analog Converters
Abstract : In this thesis we present an overview and study on digital-to-analog converters (DAC), mainly for communications applications. Especially, we look at some digital subscriber line (DSL) specifications and communication over twisted-pair channels. READ MORE