Seminari di Fisica Matematica
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| Seminari A.A. 2018-2019 |
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Relatore |
Titolo |
Data |
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Davide Macera
Universtà Roma Tre |
05 luglio 2019 |
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Dimitri Tsagkarogiannis
Università dell'Aquila |
02 luglio 2019 (ore 11:30) |
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Federico Bonetto
Georgia Institute of Technology |
04 giugno 2019 |
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Eveliina Peltola
Université de Genève |
09 maggio 2019 |
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Sebastien Ott
Université de Genève |
26 marzo 2019 |
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Giovanni Antinucci
Universität Zürich |
12 marzo 2019 |
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Giovanni Gallavotti
Università La Sapienza |
19 febbraio 2019 |
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Hugo Duminil-Copin
IHES & Université de Genève |
12 febbraio 2019 |
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Salvador Miracle-Sole
CNRS Marseille |
17 gennaio 2019 (giovedì aula F) |
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Carlangelo Liverani
Università Tor Vergata |
08 gennaio 2019 |
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Federico Bonetto
Georgia Tech |
18 dicembre 2018 (ore 15:30) |
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Massimo Moscolari
Università "La Sapienza" |
18 dicembre 2018 |
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Niels Benedikter
IST Austria |
27 novembre 2018 |
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Guido Gentile
Università Roma Tre |
15 novembre 2018 (giovedì Aula 211) |
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Abstract ritorna |
Mercury is entrapped in a 3:2 resonance: it rotates on its axis three times for every two revolutions
it makes around the Sun. It is generally accepted that this is due to the large value of Mercury's
eccentricity. However, the athematical model commonly used to study the problem -- sometimes called
the spin-orbit model -- proved not to be entirely convincing, because of the expression used for
the tidal torque. Only recently, a different model for the tidal torque has been proposed, with
the advantage of both being more realistic and providing a higher probability of capture into
the 3:2 resonance with respect to the previous models. On the other hand, a drawback of the model
is that the function describing the tidal torque is not smooth and appears as a superposition of
peaks, so that both analytical and numerical computations turn out to be rather delicate. We shall
present numerical and analytical results about the nature of the librations of Mercury's spin in
the 3:2 resonance, as predicted by the realistic model. In particular we shall provide evidence
that the librations are quasi-periodic in time, so that the very concept of resonance should be
revisited. The analytical results are mainly based on perturbation theory and leave several open
problems, that we shall discuss.
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Clément Erignoux
Università Roma Tre |
23 ottobre 2018 |
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