COOKIES: By using this website you agree that we can place Google Analytics Cookies on your device for performance monitoring. |

University of Cambridge > Talks.cam > Galaxies Discussion Group > Self-Gravity, Resonances & Orbital diffusion in stellar discs

## Self-Gravity, Resonances & Orbital diffusion in stellar discsAdd to your list(s) Download to your calendar using vCal - Jean-Baptiste Fouvry (IAP)
- Friday 30 January 2015, 11:30-12:30
- Kavli LMR, IoA.
If you have a question about this talk, please contact Martin Haehnelt. Fluctuations in a stellar systemâ€™s gravitational field cause the orbits of stars to evolve. The resulting evolution of the system can be computed with the orbit-averaged dressed Fokker-Planck equation in angle-actions coordinates. I will present the formalism that enables one to compute the diffusion tensor from a given source of noise in the gravitational field when the systemâ€™s dynamical response to that noise is included. In the case of a cool stellar disc we are able to reduce the computation of the diffusion tensor to a one-dimensional integral. The shot-noise-driven formation of narrow ridges of resonant orbits is therefore recovered in the WKB limit of tightly wound transient spirals, for a tepid Toomre-stable tapered disc, so that we are able to explain analytically the principal features of numerical simulations of such discs. This talk is part of the Galaxies Discussion Group series. ## This talk is included in these lists:- Combined External Astrophysics Talks DAMTP
- Cosmology, Astrophysics and General Relativity
- Galaxies Discussion Group
- Institute of Astronomy Talk Lists
- Kavli Institute for Cosmology Talk Lists
- Kavli LMR, IoA
Note that ex-directory lists are not shown. |
## Other listsMeeting the Challenge of Healthy Ageing in the 21st Century Cambridge Clinical Research Centre for Affective Disorders (C2:AD) Social Psychology Seminar Series (SPSS) Insect Molecular Biology Homerton 250## Other talksUsing single-cell technologies and planarians to study stem cells, their differentiation and their evolution Sustainability 101: how to frame it, change it and steer it Simulating wave propagation in elastic systems using the Finite-Difference-Time-Domain method CANCELLED First year PhD student fieldwork seminar Art speak Bank credit rating changes, capital structure adjustments and lending |