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Exploding Galaxies and other Catastrophysics

3-D supernovae and CP violation

18 May 2010, 19:31 UTC
3-D supernovae and CP violation
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Some cool science news:1. New simulations of supernova explosions by Müller's group at MPIA show significant differences in behaviour from previous antisymmetric 2-D simulations (MPIA press release, which is also the source of the image shown on the right).The new computer models of the team at the Max Planck Institute for Astrophysics can now for the first time simulate the complete burst in all three dimensions, from the first milliseconds after the explosion is triggered in the core to a time three hours later, when the shock breaks out of the progenitor star. "We found substantial deviations in our 3D models compared to previous work in 2D," says Nicolay Hammer, the lead author of the paper, "especially the growth of instabilities and the propagation of clumps differ. These are not just minor variations; this effect determines the long-time evolution and ultimately the extent of mixing and observable appearance of core-collapse supernovae."In the 3D-simulations, metal-rich clumps have much higher velocities than in the 2D case. These "bullets" expand much more rapidly, overtaking material from the outer layers. "With a simple analytic model we could demonstrate that the different geometry of the bullets, toroidal versus quasi-spherical, can explain the differences observed in ...

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