# Jean-Luc Movie: /NCSA1999/NeutronStars/Meudon_161_IVP/Psi4Meudon

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## Even-Parity Gravitational Waves from Meudon initial data

This movie shows \left(Re\{\Psi_4\} r^2\right)^5 in the range -10-6 to 10-6. Multiplication by r2 was done to compensate for the r-2 radial falloff of \Psi_4 (in the asymptotically spherical symmetric), to bring out more of the details of the fields at all locations in the space. Especcially some outgoing wave structure remains of constant intensity due to this multiplication.

Exponentiation by 5 was done to supress small noisy structures around the zero value, such that only more intense, denser parts come out more prominently. The colormap was chosen to rapidly change at zero, such that positive and negative values are clearly distinguishable, but at the value zero (were most of the data resides) the colormap is transparent. So only dense positive and dense negative parts of the \Psi_4 are left.

Nicely it is visible that Re{\Psi_4} has a `cross-like' structure along the connection axis of the initial neutron star positions (the x-axis). The negative areas reside in the rotation plane (xy-plane), the positive areas towards the rotation axis (in the xz-plane). During evolution, a positive and a negative-valued ring-like structure separates from the neutron stars and dissolves into outer space.

Although these are nice clear structures, it is unlikely that these wave structures are very physical, they can more be seen as already to be contained in the initial data.

 Simulation code: AEI , WashU Meudon Initial Data: Silvano Bonazzola, Eric Gourgoulhon and Jean-Alain Marck (see gr-qc/9810072 and gr-qc/9904040)

 ( Mpeg -