Skyscapes of Clifton

Skyscapes are a combination of landscape, sky, and people in the context of a full place experience including the temporal dimension. When a viewer becomes aware of rhythms in sky and environments, memories and history unravel. The viewer enters a dialogue with place and experiences the skyscape through watching, allowing the exploration of its meaning. This project is an interdisciplinary approach towards skyscape through deeper engagement with the place of Clifton campus at Nottingham Trent University (NTU). A phenomenological approach will identify locations that reveal memories and an affectional dimension. The panorama will be implemented into a planetarium software (Stellarium) to experience the passage of celestial objects in time, and reveal rhythms and cycles through which the Clifton campus defines itself. Essentially, it will illutstare how place and therefore skyscape is explored

An extension of the Statistical Bootstrap Model to include Strangeness. Implications on Particle Ratios

The Statistical Bootstrap Model (SBM) is extended to describe hadronic systems which carry the quantum number of strangeness. The study is conducted in the three-dimensional space of temperature, up-down and strange chemical potentials, wherein the existence of a ``critical'' surface is established, which sets the limits of the hadronic phase of matter. A second surface, defined by the null expectation value of strangeness number is also determined. The approach of the latter surface to the critical one becomes the focal point of the present considerations. Two different versions of the extended SBM are examined, corresponding to the values 2 and 4 for the exponent, which determines the asymptotic fall-off of the mass spectrum. It is found that the version with the value 4 has decisive physical advantages. This model is subsequently adopted to discuss (strange) particle ratios pertaining to multiparticle production processes, for which a thermal equilibrium mode of description applies.Comment: 29 pages, 38 figures, all the figures are joined in one file. accepted for publication in Phys. Rev.

Probing the boundaries of the Hadronic Phase through a Strangeness including Statistical Bootstrap Model (S-SBM)

A recently constructed strangeness-including Statistical Bootstrap Model (S-SBM), which defines the limits of the hadronic phase and provides for a phase beyond, is further extended so as to include a factor that describes strangeness suppression. The model is then used to analyse the multiplicity data from collision experiments in which the colliding entities form isospin symmetric systems, the primary focus being on S+S interactions (NA35 collaboration). An optimal set of thermodynamical variables is extracted through a fit to both the inclusive full phase space and midrapidity data. The assumption that the measured particles originate from a thermally and partial-chemically equilibrated source described by the S-SBM is satisfactorily established. The proximity of the thermodynamical variables extracted from the S+S data to the limits of the hadronic phase is systematically investigated. Finally, experimental data from proton-antiproton collisions (UA5 collaboration) are similarly analysed.Comment: 39 pages, 17 figures, all the figures joined in one file. Submitted in Phys. Rev.

A Functional Integral Equation for the Complete Effective Action in Quantum Field Theory

Based on a methodological analysis of the effective action approach certain conceptual foundations of quantum field theory are reconsidered to establish a quest for an equation for the effective action. Relying on the functional integral formulation of Lagrangian quantum field theory a functional integral equation for the complete effective action is proposed which can be understood as a certain fixed point condition. This is motivated by a critical attitude towards the distinction artificial from an experimental point of view between classical and effective action. While for free field theories nothing new is accomplished, for interacting theories the concept differs from the established paradigm. The analysis of this new concept is concentrated on gauge field theories treating QED as the prototype model. An approximative approach to the functional integral equation for the complete effective action of QED is exploited to obtain certain nonperturbative information about the quadratic kernels of the action. As particular application the approximative calculation of the QED coupling constant $\alpha$ is explicitly studied. It is understood as one of the characteristics of a fixed point given as a solution of the functional integral equation proposed. Finally, within the present approach the vacuum energy problem is considered and possible implications on the induced gravity concept are contemplated.Comment: 88 pages, LATEX, 9 figures (not included, available from the author upon request via conventional mail), University of Leipzig preprint NTZ 16/199