I report on a critical analysis of the scenario of electroweak baryogenesis mediated by nonsuperconducting cosmic strings. This mechanism relies upon electroweak symmetry restoration in a region around cosmic strings, where sphalerons would be unsuppressed. I discuss the various problems this scenario has to face, presenting a careful computation

The influence of the environment on the processes that regulate the history of star formation and the chemical enrichment in galaxies is a key ingredient for the study of galaxy evolution. New evidence has accumulated reinforcing the idea that galaxies located in high density environments, such as groups or clusters, may exhibit different levels of

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Introduction Method Data Analysis and Results Conclusions