P Rossi – författare

These proceedings are the result of a three-day meeting held in Oogliani (Italy), on October 2-4 2003, whose title was "VIrtual Astrophysical Jets 2003". Our goal in convening this meeting was to gather some of the scientists among the most active in the field of numerical simulations and modelling of astrophysi­ cal jets. For keeping the participants close to the "real world", we also invited a few observers to give up-to-date reviews outlining the state-of-the-art of jet observations. The principal aim of the meeting was thus to present and critically discuss the state-of-the-art numerical simulations, analytical models and laboratory ex­ periments for reproducing the main aspects of astrophysical jets and compar­ ing them with observations. The discussion has been focused on the following topics: • Observations and intepretions of jets from young stars and AGNs, comparisons of models with observations; • MHO accelerations of jets: steady self-similar models, MHO numerical simula­ tions of time-dependent accelerations mechanisms; • Jet stability and interaction with the ambient: formation of knots in YSO jets, jet survival to instabilities, deceleration of relativistic jets in FRI sources, simulations of jets-IGM interactions, jets propagation and galaxy formation; • Numerical codes and their validation: relativistic MHO codes, comparisons among different numerical schemes, jets in the laboratory and code validation. These topics have been discussed intensively during the meeting, and the out­ come of these discussions is presented in this volume. The contributions have been divided in five sections.

These proceedings are the result of a three-day meeting held in Oogliani (Italy), on October 2-4 2003, whose title was "VIrtual Astrophysical Jets 2003". Our goal in convening this meeting was to gather some of the scientists among the most active in the field of numerical simulations and modelling of astrophysi­ cal jets. For keeping the participants close to the "real world", we also invited a few observers to give up-to-date reviews outlining the state-of-the-art of jet observations. The principal aim of the meeting was thus to present and critically discuss the state-of-the-art numerical simulations, analytical models and laboratory ex­ periments for reproducing the main aspects of astrophysical jets and compar­ ing them with observations. The discussion has been focused on the following topics: • Observations and intepretions of jets from young stars and AGNs, comparisons of models with observations; • MHO accelerations of jets: steady self-similar models, MHO numerical simula­ tions of time-dependent accelerations mechanisms; • Jet stability and interaction with the ambient: formation of knots in YSO jets, jet survival to instabilities, deceleration of relativistic jets in FRI sources, simulations of jets-IGM interactions, jets propagation and galaxy formation; • Numerical codes and their validation: relativistic MHO codes, comparisons among different numerical schemes, jets in the laboratory and code validation. These topics have been discussed intensively during the meeting, and the out­ come of these discussions is presented in this volume. The contributions have been divided in five sections.

The peculiar and important characteristic of this book is to present numerical simulations and models of both stellar and extragalactic jets, together with review papers outlining the state-of-the-art of the observations of jets. In fact, other books on jets deal either with stellar jets or extragalactic jets separately but are lacking, until now, a more global view. The authors of these contributions are among the most active scientists in the field of theoretical interpretation of the astrophysical jets phenomenology. The book is intended for readers that are carrying out research in the fields of accretion and outflow phenomena in astrophysics, star formation, Active Galactic Nuclei, computational fluid dynamics and magneto-hydrodynamics applied to astrophysics.

This book is a collection of more than 100 problems selected from the examination questions for a graduate course in theoretical physics. Every problem is discussed and solved in detail. A wide range of subjects is covered, from potential scattering to atomic, nuclear and high energy physics. Special emphasis is devoted to relativistic quantum mechanics and its application to elementary processes: S-matrix theory, the role of discrete symmetries, the use of Feynman diagrams and elementary perturbative quantum field theory.The course attaches great importance to recitation sessions, where thorough problem solving becomes a true test of mastery of theoretical background.The authors are experts in their fields. A Di Giacomo taught “theoretical physics” for about 20 years. G Paffuti and P Rossi held recitations for several years. More recently, Haris Panagopoulos followed suit. He assisted the authors in preparing this English version translated from the Italian.For physicists and especially for graduate and advanced undergraduate students in theoretical physics, this book is a positive guide in the intricacies of problem-solving. A further feature that adds practical value to this book is that most problems correspond to realistic physical processes and their numerical results are compared to experimental values whenever possible.