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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
361

Superconformal quantum field theories in string / gauge theory dualities

Wiegandt, Konstantin 25 October 2012 (has links)
In dieser Dissertation werden Aspekte von superkonformen Quantenfeldtheorien untersucht, die für die sogenannte AdS/CFT Korrespondenz relevant sind. Die AdS/CFT Korrespondenz beschreibt eine Dualität zwischen Stringtheorien im Anti-de Sitter Raum und superkonformen Quantenfeldtheorien im Minkowskiraum. In diesem Kontext wurde die sog. Wilsonschleifen / Amplituden Dualität entdeckt, die die Übereinstimmung von n-Gluon MHV Amplituden und n-seitigen polygonalen Wilsonschleifen in der N=4 supersymmetrischen Yang-Mills (SYM) Theorie beschreibt. Im ersten Teil dieser Dissertation wird die Wilsonschleifenseite einer solchen möglichen Dualität in der N=6 superkonformen Chern-Simons (ABJM) Theorie untersucht. Das Hauptergebnis dieser Untersuchungen ist, dass der Erwartungswert der n-seitigen polygonalen Wilsonschleifen auf Einschleifenebene verschwindet, während er auf Zweischleifenebene in seiner funktionalen Form identisch zu der analogen Wilsonschleife in N=4 SYM auf Einschleifenniveau ist. Außerdem wird eine anomale konforme Wardidentität für Wilsonschleifen in Chern-Simons Theorie berechnet. Zudem werden die damit im Zusammenhang stehenden Entwicklungen für Amplituden und Korrelatoren in der ABJM Theorie diskutiert. Im zweiten Teil dieser Dissertation werden Dreipunktfunktionen von zwei geschützten Operatoren und einem Twist-Zwei Operator mit beleibigem Spin j in der N=4 SYM Theorie berechnet. Dafür werden die Indizes des Spin j Operators auf den Lichtkegel projiziert und der Korrelator wird in einem Grenzfall untersucht in dem der Impuls der bei dem Spin j Operator einfließt verschwindet. Dieser Grenzfall vereinfacht die perturbative Berechnung erheblich, da alle Dreipunktdiagramme effektiv auf Zweipunktdiagramme reduziert werden und die Abhängigkeit der Mischungsmatrix auf Einschleifenebene herausfällt. Das Ergebnis stimmt mit der Analyse der Operatorproduktentwicklung von Vierpunktfunktionen geschützter Operatoren von Dolan und Osborn aus dem Jahre 2004 überein. / In this thesis aspects of superconformal field theories that are of interest in the so-called AdS/CFT correspondence are investivated. The AdS/CFT correspondence states a duality between string theories living on Anti-de Sitter space and superconformal quantum field theories in Minkowski space. In the context of the AdS/CFT correspondence the so-called Wilson loop / amplitude duality was discovered, stating the equality of the finite parts of n-gluon MHV amplitudes and n-sided lightlike polygonal Wilson loops in N=4 supersymmetric Yang-Mills (SYM) theory. It is the subject of the first part of this thesis to investigate the Wilson loop side of a possible similar duality in N=6 superconformal Chern-Simons matter (ABJM) theory. The main result is, that the expectation value of n-sided lightlike polygonal Wilson loops vanishes at one-loop order and at two-loop order is identical in its functional form to the Wilson loop in N=4 SYM theory at one-loop order. Furthermore, an anomalous conformal Ward identity for Wilson loops in Chern-Simons theory is derived. Related developments and symmetries of amplitudes and correlators in ABJM theory are discussed as well. In the second part of this thesis we calculate three-point functions of two protected operators and one twist-two operator with arbitrary even spin j in N =4 SYM theory. In order to carry out the calculations, the indices of the spin j operator are projected to the light-cone and the correlator is evaluated in a soft-limit where the momentum coming in at the spin j operator becomes zero. This limit largely simplifies the perturbative calculation, since all three-point diagrams effectively reduce to two-point diagrams and the dependence on the one-loop mixing matrix drops out completely. The result is in agreement with the analysis of the operator product expansion of four-point functions of half-BPS operators by Dolan and Osborn in 2004.
362

The War in the Classroom: The Work of the Educational Section of the Indiana State Council of Defense during World War I

Schuster, Casey Elizabeth January 2012 (has links)
Indiana University-Purdue University Indianapolis (IUPUI) / When the United States entered World War I in April 1917, many Americans quickly rallied to support the nation. Among the numerous committees, organizations, and individuals that became active in the mobilization process were the forty-eight state councils of defense. Encouraged to form by President Wilson and his administration in the days and weeks following U.S entry in the war, the state councils grew as offshoots of the Council of National Defense and assisted in bringing every section of the country into a single scheme of work. Everyone was expected to do their part in WWI, whether they were fighting overseas or helping on the home front. The state councils, broken down into various sections and county, township, and high-school level councils, made sure that this was the case by reaching down into local communities and encouraging individuals to become involved in the war effort. Their work represented the embodiment of a “total war” philosophy and, yet, studies on these organizations are surprisingly scarce, giving readers an inadequate understanding of the American home front during the conflict. This thesis therefore places the focus directly on the state councils and examines the work they undertook to make the United States ready for, and most effective in wartime service. In particular, it explores the efforts of the Educational Section of the Indiana State Council of Defense. By concentrating on this one section, readers may gain a better understanding of the lengths that the state councils went to in order to put every person – teachers and students included – on a wartime footing.
363

Changing fictions of masculinity : adaptations of Jane Eyre and Wuthering Heights, 1939-2009

Fanning, Sarah Elizabeth January 2012 (has links)
The discursive and critical positions of the ‘classic’ nineteenth-century novel, particularly the woman’s novel, in the field of adaptation studies have been dominated by long-standing concerns about textual fidelity and the generic processes of the text-screen transfer. The sociocultural patterns of adaptation criticism have also been largely ensconced in representations of literary women on screen. Taking a decisive twist from tradition, this thesis traces the evolution of representations of masculinity in the malleable characters of Rochester and Heathcliff in film and television adaptations of Charlotte Brontë’s Jane Eyre and Emily Brontë’s Wuthering Heights between 1939 and 2009. Concepts of masculinity have been a neglected area of enquiry in studies of the ‘classic’ novel on screen. Adaptations of the Brontës’ novels, as well as the adapted novels of other ‘classic’ women authors such as Jane Austen, George Eliot and Elizabeth Gaskell, increasingly foreground male character in traditionally female-oriented narratives or narratives whose primary protagonist is female. This thesis brings together industrial histories, textual frames and sociocultural influences that form the wider contexts of the adaptations to demonstrate how male characterisation and different representations of masculinity are reformulated and foregrounded through three different adaptive histories of the narratives of Jane Eyre and Wuthering Heights. Through the contours of the film and television industries, the application of text and context analysis, and wider sociocultural considerations of each period an understanding of how Rochester and Heathcliff have been transmuted and centralised within the adaptive history of the Brontë novel.
364

Surrogatmodern och den mänskliga värdigheten : En diskursanalys av den statliga utredningen om surrogatmoderskap, ur ett kritiskt postkolonialt feministiskt perspektiv

Zanzi Ferrando, Diana January 2019 (has links)
Uppsatsen undersöker hur ”SOU 2016:11 Olika vägar till föräldraskap” formulerar problemet med surrogatmoderskap, vilka subjektspositioner som kan urskiljas i utredningen och analyserar den ut ett kritiskt postkolonialt feministiskt perspektiv.   Utredningen utgår ifrån mänsklig värdighet, autonomi och barnets bästa vilket uppsatsen belyser får konsekvenser för hur problemet med surrogatarrangemang porträtteras olika beroende på om surrogatmodern och barnet är från det globala syd eller det globala nord. Utgångspunkterna är centrala när surrogatmodern och barnet från det globala nord lyfts men får inte samma roll gällande surrogatmodern och det barn hon föder. Vidare undersöks hur subjektspositioner formuleras utifrån emotionell/icke-emotionell, sårbar/icke-sårbar, skyddsvärd/icke-skyddsvärd och blottlägger hur den svenska surrogatmodern och det inrikesfödda barnet konstrueras som emotionella, sårbara och skyddsvärda vilket skiljer sig från hur den utländska surrogatmodern och det utrikesfödda barnet konstrueras. Dessa omges att tystnad vilket får konsekvenser för hur de porträtteras och för vilka åtgärder som föreslås.   Uppsatsen bidrar till en utveckling av tidigare forskning med ett tillägg av nyckelordet skyddsvärd för att undersöka konstrueringen av surrogatmödrar. Uppsatsen visar att begreppet är relevant genom att materialet visat på delvis konstuering av emotionell och sårbar men inte skyddsvärd och att detta påverkat resultat och åtgärder. Vidare stärker uppsatsen tidigare forskning som menar att utgångspunkten mänsklig värdighet verkar för en avhumanisering av surrogatmödrar från det globala syd samt att synen på biologi varierar beroende på var ett barn föds. Uppsatsen bygger vidare på tidigare forskning som menar att uttryckt rationalitet och brist på emotion resulterar i en avhumanisering, genom att blottlägga hur det kan räcka med att subjektspositionerna möts av tysthet för att uppnå samma resultat. Detta arbete belyser hur olika subjektspositioner framställs olika i den statliga utredningen och hur koloniala idéer hänger kvar och påverkar underlag till svensk lagstiftning, samt blottlägger vilka konkreta konsekvenser detta kan få för lagförslag och för surrogatmödrar i det globala syd samt de barn de föder.

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