Objetivo Understanding of relaxation process in the presence of fluctuations, with relevance to lasers and the detection of very weak signals, has been substantially improved. New insights have been obtained into stochastic resonance, with implications for ice ages, ring lasers, electron paramagnetic resonance, and the function of sensory neurons. A new theoretical approach has been developed to the problem of occasional large fluctuations, evolving time backwards from a final state and defining a prehistory probability density. Noise induced spectral narrowing and zero dispersion spectral peaks have been discovered. An improved understanding of domain growth in the presence of fluctuations has been gained. A nonequilibrium phase transition induced by coloured noise has been discovered.It is proposed to work on the range of uncertainty inherent in the approximations required to solve certain kinds of stochastic differential equations, used to describe extremely complicated non deterministic phenomena. Comparing theoretical work with complementary analogue experiments and digital simulations it is proposed to study i) the relaxation of fluctuations in the steady state ii) the relaxation of unstable states iii) the relaxation of states that are marginally stable iv) the relaxation of metastable states of various kinds and v) the time evolution of probabilities, moments, correlations and stochastic trajectories. In each of theses cases it is intended to establish, both experimentally and theoretically i) the relative roles of internal and external stochastic fluctuations which are believed to be distinctively different and ii) the role of real external fluctuations for exponentially correlated Gaussian noise. Ámbito científico humanitieshistory and archaeologyhistoryprehistorynatural sciencesmathematicspure mathematicsmathematical analysisdifferential equationsnatural sciencesmathematicsapplied mathematicsdynamical systemsnatural sciencesphysical sciencesopticslaser physics Programa(s) FP2-SCIENCE - Programme plan (EEC) to stimulate the international cooperation and interchange needed by European research scientists (SCIENCE), 1988-1992 Tema(s) Data not available Convocatoria de propuestas Data not available Régimen de financiación CSC - Cost-sharing contracts Coordinador University of Lancaster Aportación de la UE Sin datos Dirección Bailrigg LA1 4YW Lancaster Reino Unido Ver en el mapa Coste total Sin datos Participantes (1) Ordenar alfabéticamente Ordenar por aportación de la UE Ampliar todo Contraer todo UNIVERSITAT DE BARCELONA España Aportación de la UE Sin datos Dirección GRAN VIA DE LES CORTS CATALANES 585 BARCELONA Ver en el mapa Enlaces Sitio web Opens in new window Coste total Sin datos
