| Date: |
October 22, 2008, 15:30 - 17:00 |
| Place: |
Room 633, 6th floor, Kashiwa Research Complex |
| Speaker: |
Thierry Foglizzo (Service d'Astrophysique & Waseda) |
| Title: |
From the whistle of a kettle to the asymmetric explosion of
supernovae
![[PDF]](/img/common/point04.gif)
|
| Abstract: |
How do massive stars explode ? Why are pulsars so much faster than
stars ?
I will explain how these questions are related the understanding of a
hydrodynamical
instability, named the advective-acoustic instability. It has been
introduced in
astrophysics in order to explain the hydrodynamics of supersonic
black-holes,
but its mechanism can be traced back to the whistling kettle. It is based on
the
interplay of sound and vorticity and can be analyzed by perturbative
methods.
Current numerical simulations suggest that this instability is crucial to
the
success of the explosion of a massive star. The resulting asymmetry can be
large enough to account for the observed velocity of the fastest pulsars.
|
