Seminari di Fisica Matematica
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| Seminari A.A. 2012-2013 |
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Relatore |
Titolo |
Data |
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Omar Maj
Max-Planck Inst. für Plasmaphys. Garching |
02 Luglio 2013 (ore 14:00) |
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Marco Brambilla
Max-Planck Inst. für Plasmaphys. Garching |
11 Giugno 2013 |
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Mustapha Mourragui
Université de Rouen |
16 Maggio 2013 (giovedì) |
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Mustapha Mourragui
Université de Rouen |
15 Maggio 2013 (mercoledì) |
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Bruno Coppi
MIT |
14 Maggio 2013 (ore 15:00) |
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Francesco Califano
Università di Pisa |
14 Maggio 2013 (ore 14:00) |
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Abstract ritorna |
The Vlasov equation is the fundamental mathematical model for space and laboratory plasmas
characterized by a typical collision time scale much longer than the dynamics time scale. As a
consequence, these plasmas can be considered in first approximation as collisionless and the
dynamics as Hamiltonian. As an example, in the solar wind the mean free path is of the order of the
dimension of the system (i.e. one astronomical unity) and in fact non Maxwellian distribution
functions are often observed by satellites. In general, at "small" length scales (and high frequencies)
the collisionless Vlasov mean field theory is the physical model adopted for the understanding of
the processes in which collisions are still neglected, but kinetic effects now play a key role in the
plasma dynamics. Such kinetic effects are often crucial to transfer ordered (large scale) energy on
small-scale fluctuations which, reacting on the particles, push then the system toward an
"isotropisation". This process can somewhat replace the role of collisions. Furthermore, one of the
major surprises of high-resolution space measurements has been the observation of electrostatic
coherent structures on the Debye length scale with corresponding non-Maxwellian distribution
functions. These structures have been observed in the aurora terrestrial regions and successively
also in the solar wind, even in the "more quiet" regions and can be modeled by means of the Vlasov
equation. Applications of the Vlasov equation for the study of space plasmas processes, from
coherent structure formation to wave-wave or wave-particle coupling, to plasma turbulence will be
discussed. |
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Alain Messager
CPT - CNRS Marseille |
Phase transitions in the long range XXZ model |
07 Maggio 2013 (ore 15:30) |
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Carlo Marchioro
Università di Roma "La Sapienza" |
07 Maggio 2013 |
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Milos Zahradnik
Charles University Prague |
30 Aprile 2013 (ore 15:00) |
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Daniela Grasso
CNR e Politecnico di Torino |
30 Aprile 2013 (ore 14:00) |
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Yuri Kondratev
Universität Bielefeld |
23 Aprile 2013 |
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Israel Michael Sigal
Toronto University |
12 Aprile 2013 (venerdì) |
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Errico Presutti
Università di Roma "Tor Vergata" |
09 Aprile 2013 |
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Giovanni Gallavotti
INFN Roma1 e Accademia dei Lincei |
05 Marzo 2013 |
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Alessandro Pizzo
UC Davis |
23 Ottobre 2012 (ore 16:00) |
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Zhituo Wang
Paris XI - Orsay |
26 Settembre 2012 (mercoledì) |
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Joel Lebowitz
Rutgers University |
Three easy (to state) open problems (that have worried me for many years) |
24 Settembre 2012 (lunedì 16:00 aula F) |
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Manuel de Llano
UNAM |
21 Settembre 2012 (venerdì) |
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