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EU Network Movies

Rotating neutron star: evolutions of a rapidly rotating relativistic star in stable equilibrium have also been performed. These evolutions extend to 3 rotational periods, while might appear a short time scale, they represent a considerable achievement in numerical relativity.

Oscillating neutron star:  highly non-linear oscillations about an stable configuration are produced after the migration of a nonrotating relativistic unstable star to the stable branch. Numerical truncation errors can perturb the unstable equilibrium of a relativistic star which will expand and evolve to a smaller central rest-mass density until a equilibrium configuration within the stable branch is reached.
3D Black Hole Collision:  We show the collision of two black holes, as computed by Cactus. The initial data correspond to two, nonspinning, equal mass black holes, taken to begin before the innermost stable circuclar orbit (ISCO, as defined in a paper by Baumgarte). The gravitational waves emitted are shown as colors, and the black hole apparent horizons are shown as dark surfaces. In this EU Network calculation, which is one of the first successful nonlinear simulations of orbiting black holes, they make about 1/3 orbit before merging.

This work has been supported by the EU Programme 'Improving the Human Research Potential and the Socio-Economic Knowledge Base' (Research Training Network Contract HPRN-CT-2000-00137).