A Carlini

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We consider the action principle to derive the classical, non-relativistic motion of a self-interacting particle in a 4-D Lorentzian spacetime containing a wormhole and which allows the existence of closed time-like curves. For the case of a 'hard-sphere' self-interaction potential we show that the only possible trajectories (for a particle with fixed(More)
We consider quantization of the Baierlein-Sharp-Wheeler form of the gravita-tional action, in which the lapse function is determined from the Hamiltonian constraint. This action has a square root form, analogous to the actions of the rela-tivistic particle and Nambu string. We argue that path-integral quantization of the gravitational action should be based(More)
We expand on the idea that spacetime signature should be treated as a dy-namical degree of freedom in quantum field theory. It has been argued that the probability distribution for signature, induced by massless free fields, is peaked at the Lorentzian value uniquely in D=4 dimensions. This argument is reviewed, and certain consistency constraints on the(More)
We consider the action principle to derive the classical, relativistic motion of a self-interacting particle in a 4-D Lorentzian spacetime containing a wormhole and which allows the existence of closed time-like curves. In particular, we study the case of a pointlike particle subject to a 'hard-sphere' self-interaction potential and which can traverse the(More)
The classical field equations of general relativity can be expressed as a single geodesic equation, describing the free fall of a point particle in superspace. Based on this formulation, a " worldline " quantization of gravity, analogous to the Feynman-Schwinger treatment of particle propagation, is proposed, and a hidden mass-shell parameter is identified.(More)
Towards a natural interface for the control of a whole arm prosthesis " , in Bleuler et al (Eds) New trends in medical and service robots, Processing of surface EMG through pattern recognition techniques aimed at classifying shoulder joint movements " , 37 annual international conference of the IEEE engineering in medicine and biology society, Milan August(More)
A complementarity relation is shown between the visibility of interference and bipartite entanglement in a two qubit interferometric system when the parameters of the quantum operation change for a given input state. The entanglement measure is a decreasing function of the visibility of interference. The implications for quantum computation are briefly(More)
The objective of the present study was to evaluate the outcome of a promotion program for the cohabitation between healthy living-alone-old person and university student. The study aimed to highlight the benefits of both the parts in terms of psyco-physical behaviour of the old subject and of logistic and financial support for the student. The survey was(More)