Quadratic Lagrangians and Topology in Gauge Theory Gravity

We consider topological contributions to the action integral in a gauge theory formulation of gravity. Two topological invariants are found and are shown to arise from the scalar and pseudoscalar parts of a single integral. Neither of these action integrals contribute to the classical field equations. An identity is found for the invariants that is valid for non-symmetric Riemann tensors, generalizing the usual GR expression for the topological invariants. The link with Yang-Mills instantons in Euclidean gravity is also explored. Ten independent quadratic terms are constructed from the Riemann tensor, and the topological invariants reduce these to eight possible independent terms for a quadratic Lagrangian. The resulting field equations for the parity non-violating terms are presented. Our derivations of these results are considerably simpler that those found in the literature

Heritage Futures

Heritage Futures is a four-year collaborative international research programme (2015–2019) funded by a UK Arts and Humanities Research Council (AHRC) ‘Care for the Future’ Theme Large Grant, and supported additionally by its host universities and partner organisations. The research programme involves ambitious interdisciplinary research to explore the potential for innovation and creative exchange across a broad range of heritage and related fields, in partnership with a number of academic and non-academic institutions and interest groups. It is distinctive in its comparative approach which aims to bring heritage conservation practices of various forms into closer dialogue with the management of other material and virtual legacies such as nuclear waste management. It is also distinctive in its exploration of different forms of heritage as future-making practices. This brief paper provides an introduction to the research programme and its aims and methods

Heritage Futures

Preservation of natural and cultural heritage is often said to be something that is done for the future, or on behalf of future generations, but the precise relationship of such practices to the future is rarely reflected upon. Heritage Futures draws on research undertaken over four years by an interdisciplinary, international team of 16 researchers and more than 25 partner organisations to explore the role of heritage and heritage-like practices in building future worlds. Engaging broad themes such as diversity, transformation, profusion and uncertainty, Heritage Futures aims to understand how a range of conservation and preservation practices across a number of countries assemble and resource different kinds of futures, and the possibilities that emerge from such collaborative research for alternative approaches to heritage in the Anthropocene. Case studies include the cryopreservation of endangered DNA in frozen zoos, nuclear waste management, seed biobanking, landscape rewilding, social history collecting, space messaging, endangered language documentation, built and natural heritage management, domestic keeping and discarding practices, and world heritage site management. 'I suspect this book will prove to be a revolutionary addition to the field of heritage studies, flipping the gaze from the past to the future. Heritage Futures reveals the deep uncertainties and precarities that shape both everyday and political life today: accumulation and waste, care and hope, the natural and the toxic. It represents a uniquely impressive intellectual and empirical roadmap for both anticipating and questioning future trajectories, and the strange, unfamiliar places heritage will take us.’ - Tim Winter, University of Western Australi

Heritage Futures

Preservation of natural and cultural heritage is often said to be something that is done for the future, or on behalf of future generations, but the precise relationship of such practices to the future is rarely reflected upon. Heritage Futures draws on research undertaken over four years by an interdisciplinary, international team of 16 researchers and more than 25 partner organisations to explore the role of heritage and heritage-like practices in building future worlds. Engaging broad themes such as diversity, transformation, profusion and uncertainty, Heritage Futures aims to understand how a range of conservation and preservation practices across a number of countries assemble and resource different kinds of futures, and the possibilities that emerge from such collaborative research for alternative approaches to heritage in the Anthropocene. Case studies include the cryopreservation of endangered DNA in frozen zoos, nuclear waste management, seed biobanking, landscape rewilding, social history collecting, space messaging, endangered language documentation, built and natural heritage management, domestic keeping and discarding practices, and world heritage site management. 'I suspect this book will prove to be a revolutionary addition to the field of heritage studies, flipping the gaze from the past to the future. Heritage Futures reveals the deep uncertainties and precarities that shape both everyday and political life today: accumulation and waste, care and hope, the natural and the toxic. It represents a uniquely impressive intellectual and empirical roadmap for both anticipating and questioning future trajectories, and the strange, unfamiliar places heritage will take us.’ - Tim Winter, University of Western Australi

On Galilean and Lorentz invariance in pilot-wave dynamics

It is argued that the natural kinematics of the pilot-wave theory is Aristotelian. Despite appearances, Galilean invariance is not a fundamental symmetry of the low-energy theory. Instead, it is a fictitious symmetry that has been artificially imposed. It is concluded that the search for a Lorentz-invariant extension is physically misguided.Comment: 13 pages. Published in 1997, recently latexe

Roland Penrose and the Impulse of Provence

Roland Penrose was my father. He was a poet, a painter and a dreamer who lived by his love and desire for art. He was a Surrealist and a hedonist who shamelessly enjoyed the pleasures of life, a ground-breaking curator and the biographer of Picasso. In his youth, at the age of 24, he went to live in Cassis. It was 1924 and from this moment onwards Provence shaped his taste and perception, creating a prism through which the rest of his life was defined. It is paradoxical that behind the pleasu..

Assembling Alternative Futures for Heritage

First paragraph: What do museums and archives, historic buildings preservation, rewilding initiatives, botanic gardens, and space messaging have in common? These fields share a desire to preserve 'things' (buildings, objects, places, monuments, species, knowledge) that are valued, yet are considered at risk of endangerment from loss, destruction, or decay. Practices of listing on heritage registers, or designation to protected status, articulate the view that potential or real threats must be mitigated, usually through some form of active intervention to protect. While taken-for-granted, this endangerment approach is increasingly being questioned by academic researchers (e.g., Harrison 2013, Rico 2015, Vidal and Dias 2016; DeSilvey 2017). Could heritage management and conservation be practiced differently if uncoupled from the ideas of risk and endangerment? If heritage preservation is future-oriented - in that heritage practitioners work to protect the past for the future - then what future, or futures, is it working towards, and is each the same across different kinds of preservation practices? How do we choose what to save for posterity? Questions such as these deserve far greater attention than is ordinarily given in scholarship or practice.The articles from Context are published on a searchable on-line archive six months after publication: http://ihbc.org.uk/page55/context_archive/index.htm

Provence and the British Imagination

Although it resonates today with lavender fields, sunny heritage locations and the gentrified memory of Paul Cézanne’s pictorial turbulence, Provence has not always been the attractive territory of pacified leisure and festival culture. Since the seventeenth century, indeed, the region has inscribed its shifting geography, complex politics and the extraordinary diversity of its land and seascapes in the perception and imagination of British visitors. In the steps of anonymous or excellent travellers, the chapters of this volume chart some of the most significant moments in the intercultural transactions between the proud linguistic and literary distinctiveness of the province on one hand and the always challenged and sometimes baffled perception of Anglophone (and Anglophile) visitors on the other. Spanning across two centuries, from the largely unknown pre-revolutionary Provence visited by John locke and Tobias Smollett through the Victorian paradise of popular tourism and finally to the more secret ‘homeland’ of Modernists, this volume reveals an unexpected Provence which, in oblique and complex ways, has long held a mirror to British culture and often acted as the laboratory of its artistic life

The Photobook World: Artists' Books and Forgotten Social Objects

International audienceThis volume sets out to challenge and ultimately broaden the category of the 'photobook'. It critiques the popular art-market definition of the photobook as simply a photographer's book, proposing instead to show how books and photos come together as collective cultural productions. Focusing on North American, British and French photobooks from 1920 to the present, the chapters revisit canonical works - by Claudia Andujar and George Love, Mohamed Bourouissa, Walker Evans, Susan Meiselas and Roland Penrose - while also delving into institutional, digital and unrealised projects, illegal practices, DIY communities and the poetic impulse. They throw new light on the way that gendered, racial or colonial assumptions are resisted. Taken as a whole, the volume provides a better understanding of how the meaning of a photobook is collectively produced both inside and outside the art market