A Bar-Unstable Hypermassive Neutron Star (Spiral Arms):
T/W ~ 0.26
The green line represents the division between stable (white) and bar-unstable (black)
hypermassive neutron stars. The division is at T/W ~ 0.24-0.25. Below
we evolve a configuration with T/W ~ 0.26, in the unstable region. The
yellow arrow indicates the specific model we are examining.
Scene 1: Initial Conditions of Bar-Unstable Star
Scene 2: Evolution of Bar-Unstable Star
This animation shows the evolution of the outer surface of the neutron star. It loses
stability and axisymmetry, forming spiral-arm-like structures.
Scene 3: Density profile of Bar-Unstable Star
indicates the central density, while 
indicates the maximum density.
After time advances the star exhibits instability, forming spiral-arm-like
structures.
Scene 4: Generation of Gravitational Radiation
This animation shows the time evolution of a two-dimensional color representation of the gravitational wave
amplitudes in a plane containing the rotation axis. At large distances,
the waves assume a quadrupole-like angular dependence.
In this animation we watch the evolution of the gravitational waveform
measure by the height above a plane containing the
rotation axis.
last updated 5 Nov 14 aakhan3
