1,183 research outputs found

    Bootstrapping the Minimal 3D SCFT

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    We study the conformal bootstrap constraints for 3D conformal field theories with a Z2\mathbb{Z}_2 or parity symmetry, assuming a single relevant scalar operator ϵ\epsilon that is invariant under the symmetry. When there is additionally a single relevant odd scalar σ\sigma, we map out the allowed space of dimensions and three-point couplings of such "Ising-like" CFTs. If we allow a second relevant odd scalar σ\sigma', we identify a feature in the allowed space compatible with 3D N=1\mathcal{N}=1 superconformal symmetry and conjecture that it corresponds to the minimal N=1\mathcal{N}=1 supersymmetric extension of the Ising CFT. This model has appeared in previous numerical bootstrap studies, as well as in proposals for emergent supersymmetry on the boundaries of topological phases of matter. Adding further constraints from 3D N=1\mathcal{N}=1 superconformal symmetry, we isolate this theory and use the numerical bootstrap to compute the leading scaling dimensions Δσ=Δϵ1=.58444(22)\Delta_{\sigma} = \Delta_{\epsilon} - 1 = .58444(22) and three-point couplings λσσϵ=1.0721(2)\lambda_{\sigma\sigma\epsilon} = 1.0721(2) and λϵϵϵ=1.67(1)\lambda_{\epsilon\epsilon\epsilon} = 1.67(1). We additionally place bounds on the central charge and use the extremal functional method to estimate the dimensions of the next several operators in the spectrum. Based on our results we observe the possible exact relation λϵϵϵ/λσσϵ=tan(1)\lambda_{\epsilon\epsilon\epsilon}/\lambda_{\sigma\sigma\epsilon} = \tan(1).Comment: 16 pages, 6 figures; V2: references adde

    Taking the Next Step - Implementing a Currency Transaction Development Levy

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    As we approach the half-way point for the achievement of many of the Millennium Development Goals (MDGs) the spotlight is shining ever more intently on the urgent need for new sources of revenue to pay for them. With the first international development duty launched, in the form of the ‘pilot’ solidarity levy on air travel, the momentum needs to continue to the implementation in quick succession of a second such initiative to provide another long term predictable source of additional finance. Innovation is required not just in financing but also in delivery. UNITAID’s mission is to transform a situation of high cost drugs for the treatment of the few to low cost drugs for the care of the many. In so doing its potential value is exponentially greater than a simple addition of extra revenue. The choice of how and where the next new stream of finance is spent also needs to be to be similarly strategic. The Core Group1 Governments rightly pride themselves on an international development policy that has, as one of its pillars, the tackling of global inequality which has risen rapidly in the latest phase of globalisation. For example President Chirac opened the Paris conference held in February 2006 in Paris stating that ‘despite the continuous increase in global wealth, a third of humankind still lives on less than a euro a day’, and that ‘…globalisation, far from bridging the (poverty) gap, is widening it even further’. In this report, we offer some suggestions for tackling global inequality through concrete proposals for both raising substantial new revenue equitably and spending it in ways that strategically target the ‘weak spots’ in the international development effort. The financial services industry has been one of the biggest beneficiaries of globalisation. Annual turnover in the global market for currencies, has, for instance, expanded from about 4trillionin1973to4 trillion in 1973 to 40 trillion in the mid 1980s to more than 450trillionnowamorethan100foldincrease.2Profitsatfinancialservicesfirmsarealsoatarecordhighwiththetoptwomostprofitablebanks,CitibankandHSBC,postingmorethan450 trillion now – a more than 100 fold increase.2 Profits at financial services firms are also at a record high with the top two most profitable banks, Citibank and HSBC, posting more than 40 billion of profits between them in 2005 alone. At the same time as industries such as airlines and financial services have benefited from globalisation, populations in many of the poorest countries, especially those in sub- Saharan Africa, have been left behind – or worse, harmed. Average life expectancy in these countries is in fact down from 50 years in 1990 to 45 years now, just over half the almost 80-year life expectancy in countries such as Norway. The health, education and productivity problems caused by a lack of access to basics such as clean drinking water and sanitation facilities, the added decimation wrought by global pandemics such as HIV/AIDS on the ability of the populations and systems in poor countries to cope, and the increased vulnerability linked to climate change, all threaten to undermine and, in fact, roll back the slow progress that has been made to date towards meeting the MDGs. In Section 2 we demonstrate in some detail how, by introducing a very small levy of less than a hundredth of one per cent on currency transactions, many countries can unilaterally generate substantial resources for development from those who can most afford to pay. Such a levy is simple and inexpensive to apply in this age of electronic transfers. Whilst this proposal is specific to the currency market, it can be generalised to apply to other financial markets many of which already pay some form of a levy. The possible uses for this revenue that we propose in Section 4 have been shaped by the need to lever maximum results from the resources generated. The three potential areas for immediate financing that we have identified would generate positive additional outcomes towards the achievement of several seemingly unrelated development goals. First, provision of clean water and sanitation, as it is a foundation stone that underlies the ability to make meaningful progress with the vast majority of the MDGs. Second, providing human resources for health, because without sufficient trained health workers, medicines and infrastructure are simply not enough on their own to contain the raging pandemics of HIV/AIDS, TB and malaria. Third, providing a long term predictable source of funds to an expanded UN Central Emergency Response Fund, to create a more robust response to the growing threat of natural disasters and humanitarian emergencies.currency tax; tobin tax; MDG; Financial markets; Financial Transaction Taxes

    German Odysseys of the First World War

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    This thesis examines the journeys of four separate German military units away from the European theater and forced to operate without aid or allies in the Indian, Pacific, and Atlantic Oceans, as well as in Africa. Each group had a clear goal to accomplish, to strengthen the German war effort from abroad, either by disrupting, evading, or diverting Allied personnel and war materiel. To accomplish this, each group required cunning, discipline, deception, and strong leadership. These odysseys, although more aptly compared to Xenophon’s Anabasis, demonstrate the global nature of the First World War, the deterioration of international good will and chivalry towards one’s adversaries between 1914 and 1919, and the success of unconventional strategies in evading overwhelming enemy forces while away from the Eastern or Western Fronts. This thesis specifically examines the journeys of the SMS Emden in the Pacific and Indian Oceans from the summer of 1914 to November 1914, her landing crew through the Indian Ocean and Middle East from November 1914 to May 1915, the SMS Seeadler from her conception in the summer of 1916 to August 1917, and the Schutztruppe in German East Africa from 1914 to 1918. The leaders of these groups were Karl von Müller, Hellmuth von Mücke, Count Felix von Luckner, and Paul von Lettow-Vorbeck respectively

    Media Selection in the Air Force Environment: How Communications Requirements Influence Effectiveness as an Outcome of Media Choice

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    Over the past two decades, great interest has been given to the research of media choice within organizations. However, there is still confusion over which factors influence media choice. This study examined the effectiveness of five media under different conditions in an effort to better understand which factors impact media choice. Through the examination of several theories on communication and media choice, a theoretical model was created to determine if effectiveness is an outcome of media choice. To test the proposed model, a 54 scenario policy capturing instrument was developed and distributed. Results from the study support the theory that effectiveness is an outcome of media choice. Further results indicated that effectiveness of a media choice depends on communications requirements. The original three-factor model consisting of Urgency, Complexity, and Familiarity provided a good fit for four of the five media, while revised models utilizing additional factors provided good fits for all five of the media. It is the researcher\u27s belief that the revised models will be extremely useful in the continued study of the factors that influence an individual\u27s choice of one media over another

    German Odysseys of the First World War

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    This thesis examines the journeys of four separate German military units away from the European theater and forced to operate without aid or allies in the Indian, Pacific, and Atlantic Oceans, as well as in Africa. Each group had a clear goal to accomplish, to strengthen the German war effort from abroad, either by disrupting, evading, or diverting Allied personnel and war materiel. To accomplish this, each group required cunning, discipline, deception, and strong leadership. These odysseys, although more aptly compared to Xenophon’s Anabasis, demonstrate the global nature of the First World War, the deterioration of international good will and chivalry towards one’s adversaries between 1914 and 1919, and the success of unconventional strategies in evading overwhelming enemy forces while away from the Eastern or Western Fronts. This thesis specifically examines the journeys of the SMS Emden in the Pacific and Indian Oceans from the summer of 1914 to November 1914, her landing crew through the Indian Ocean and Middle East from November 1914 to May 1915, the SMS Seeadler from her conception in the summer of 1916 to August 1917, and the Schutztruppe in German East Africa from 1914 to 1918. The leaders of these groups were Karl von Müller, Hellmuth von Mücke, Count Felix von Luckner, and Paul von Lettow-Vorbeck respectively

    The Thematic Changes in DEFA Cinema

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    This presentation examines the evolving themes in the films produced by the German Democratic Republic’s (GDR) film monopoly Deutsche Film-Aktiengesellschaft (DEFA) from its founding in 1946 through German Reunification in 1990. It analyzes ten films that span a variety of genres, including the ‘rubble films’ (Trümmerfilme), fairy tale films (Märchenfilme), and the GDR-American westerns (Indianerfilme). They are also reflective of the different periods of GDR politics in which they were made, such as the brief GDR ‘New Wave’, the banned films of the mid-1960’s, and the push for films addressing contemporary society (Gegenwartsfilme) after 1971. By examining the themes of these films, and how they were received by both the people of the GDR and the GDR’s governing socialist party—the Sozialistische Einheitspartei Deutschlands (SED)—one can see how the thematic evolution of these films was a critical component in shaping the society’s values, as well as a reflection of the changing values and generational concerns that developed during DEFA’s forty-six years of operation. The two films that stand in starkest juxtaposition to each other, especially from what many outside the GDR expected from DEFA cinema, are The Murderers are Among Us (Die Mӧrder sind unter uns), the first film produced by DEFA in 1946, and The Architects (Die Architekten) from 1990, the final DEFA film produced in the GDR
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