This thesis presents several new insights on the interface between mathematics and theoretical physics, with a central role for Riemann surfaces. First of all, the duality between Vafa-Witten theory and WZW models is embedded in string theory. Secondly, this model is generalized to a web of dualities connecting topological string theory and N=2 supersymmetric gauge theories to a configuration of D-branes that intersect over a Riemann surface. This description yields a new perspective on topological string theory in terms of a KP integrable system based on a quantum curve. Thirdly, this thesis describes a geometric analysis of wall-crossing in N=4 string theory. And lastly, it offers a novel approach to constuct metastable vacua in type IIB string theory.
Floods are a fundamental part of Dutch history. Indeed, having ‘tamed’ the threats associated with living below sea level is part of Dutch national identity. In the cultural depictions of these devastating events, however, national pride at a certain collective resilience goes hand-in-hand with the collective trauma of exposed vulnerability. All too often, the Dutch were the losers in these battles against the elements. In a time of rising global sea levels, cultural scholar Lotte Jensen dives into the stories and images of the past to unpack this paradox for today. Over the centuries, large parts of the Netherlands have been progressively reclaimed from its river delta home. Throughout that process, the country suffered countless floods, a number of which were truly catastrophic, such as the Saint Elizabeth’s Flood of 1421 or the North Sea Flood of 1953. Jensen describes how the Dutch have dealt with these disasters, in practice but also in the imagination. It is the story of babies in floating cradles, fatherly monarchs, community fundraisers, and the boy who stuck his finger in the dike. Centuries before the nation-building associated with the 1800s, the Dutch created a unifying ‘us’ – the image of the Dutch lion – against a ‘them’ – the ‘waterwolf’, the major threat which water embodied. This national feeling and narrative were crafted with a set repertoire of images; role models (heroes and monarchs); charity (national and international solidarity); and a culture of remembrance. Jensen gives particular attention to the at times funny poems, books and songs, later criticized as clichéd or melodramatic, which these collective traumas inspired. She also demonstrates through monuments and works of art how this narrative has multiplied and acquired variations with time right up to the present. Though once cast in a more religious light – the flood as punishment for a general lack of religious devotion – the waterwolf has become, for example, a collective responsibility for the environment that begins with lifestyle choices. Today the Netherlands lives with water more than it battles it, some thinkers even envisioning an ‘amphibian’ future for the country. The stories and images of the past, however, reveal that precisely vulnerability can be fertile ground for solidarity and togetherness. With rising sea levels representing a growing threat, this well-researched and highly readable cultural history shows how over time a culture’s imagination can gain new relevance beyond its borders. Acknowledging and building from a place of collective vulnerability might now be more important than ever.
Amsterdam was, after London and Paris, the third largest city in early modern Europe, and was renowned throughout Europe for its widespread and visible prostitution. Delving deep into a wide range of sources, but making particular use of the transcripts of thousands of trials, The Burgher and the Whore reconstructs Amsterdam's whoredom in detail. The colourful and fascinating descriptions of the prostitutes, their bawds, their clients, and the police shed new light on the cultural, social, and economic conditions of the lives of poor women in a seafaring society. Lotte van de Pol explores how the vice trade was embedded in Amsterdam's society, economy, and judicial system, and how legislation and policing were shaped by misogynist attitudes towards women and fear of God's wrath and venereal diseases towards sex. The story concentrates on the people living at the margins of a rich metropolis, in which there was a large surplus of women, many of them poor immigrants with little prospect of marriage. Many changes are visible in the 150 years under scrutiny, including the view of prostitution from immorality to trade, and of prostitutes from whores and criminals to paupers. The result is a book that can be read as the history of the Dutch Golden Age from below.
This thesis presents several new insights on the interface between mathematics and theoretical physics, with a central role for Riemann surfaces. First of all, the duality between Vafa-Witten theory and WZW models is embedded in string theory. Secondly, this model is generalized to a web of dualities connecting topological string theory and N=2 supersymmetric gauge theories to a configuration of D-branes that intersect over a Riemann surface. This description yields a new perspective on topological string theory in terms of a KP integrable system based on a quantum curve. Thirdly, this thesis describes a geometric analysis of wall-crossing in N=4 string theory. And lastly, it offers a novel approach to constuct metastable vacua in type IIB string theory.
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