The analytic structure of the non-perturbative gluon propagator contains information on the absence of gluons from the physical spectrum of the theory. We study this structure from numerical solutions in the complex momentum plane of the gluon and ghost Dyson-Schwinger equations in Landau gauge Yang-Mills theory. The resulting ghost and gluon propagators are analytic apart from a distinct cut structure on the real, timelike momentum axis. The propagator violates the Osterwalder-Schrader positivity condition, confirming the absence of gluons from the asymptotic spectrum of the theory.

These results can be accounted for by the assumption that body part coding of gestures depends on left hemisphere function and that additional right hemisphere contributions are afforded when demands on perceptual discrimination rise.

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Abstract. The emergence of identity management indicates that the process of identification has reached a stage where analog and digital environments converge. This is also reflected in the increased efforts of governments to introduce electronic ID systems, aiming at security improvements of public services and unifying identification procedures to contribute to administrative efficiency. Though privacy is an obvious core issue, its role is rather implicit compared to security. Based on this premise, this paper discusses a control dilemma: the general aim of identity management to compensate for a loss of control over personal data to fight increasing security and privacy threats could ironically induce a further loss of control. Potential countermeasures demand user-controlled anonymity and pseudonymity as integral system components and imply further concepts which are in their early beginnings, e.g., limiting durability of personal data and transparency enhancements with regard to freedom of information to foster user control.