Setting live coding performance in wider historical contexts

This paper sets live coding in the wider context of performing arts, construed as the poetic modelling and projection of liveness. Concepts of liveness are multiple, evolving, and scale-dependent: entities considered live from different cultural perspectives range from individual organisms and social groupings to entire ecosystems, and consequently reflect diverse temporal and spatial orders. Concepts of liveness moreover evolve with our tools, which generate and reveal new senses and places of vitality. This instability complexifies the crafting of live events as artistic material: overriding habitual frames and scales of reference is a challenge when handling infinitely scalable computational phenomena. With its generative affordances, improvised interactive programming, and notational possibilities, live coding introduces unique qualities into the performance arena. At the same time, performance history abounds in adaptive systems which anticipate certain live coding criteria. Historic performance and contemporary coding practices raise shared questions that can enhance our understanding of live art, notably to do with feedback, fixed versus on-the-fly programmable conceptual and physical frameworks, and inscriptive practices and notation methods for live action. I attempt to address such questions by setting live coding in a wider performance history perspective

High-Energy Tests of Lorentz Invariance

We develop a perturbative framework with which to discuss departures from exact Lorentz invariance and explore their potentially observable ramifications. Tiny non-invariant terms introduced into the standard model Lagrangian are assumed to be renormalizable (dimension $\le 4$), invariant under $SU(3)\otimes SU(2)\otimes U(1)$ gauge transformations, and rotationally and translationally invariant in a preferred frame. There are a total of 46 independent TCP-even perturbations of this kind, all of which preserve anomaly cancellation. They define the energy-momentum eigenstates and their maximal attainable velocities in the high-energy limit. The effects of these perturbations increase rapidly with energy in the preferred frame, more rapidly than those of TCP-odd perturbations. Our analysis of Lorentz-violating kinematics reveals several striking new phenomena that are relevant both to cosmic-ray physics ({\it e.g.,} by undoing the GZK cutoff) and neutrino physics ({\it e.g.,} by generating novel types of neutrino oscillations). These may lead to new and sensitive high-energy tests of special relativity.Comment: 33 pages, uses harvmac. This 2nd revision corrects two typos, an error in the Appendix, and includes further acknowledgement

Freeway Park

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Manhattan Square Park

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Manhattan Square Park

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Freeway Park

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Lovejoy Park and Fountain

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Manhattan Square Park

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Auditorium Forecourt Fountain

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