Session 6: Cosmology and Relativity

Title: Equations for polar perturbations of slowly rotating neutron stars in a new Gauge
Author(s): K. Kokkotas, J. Ruoff, A. Stavridis (Oral)

Perturbation equations for slowly rotating relativistic stars were studied until now, in Regge Wheeler Gauge which is good for the axial part of the perturbations. For the polar part of the perturbations though the equations are quite complicated and not straightforward to write them in first order system, suitable for time evolutions. With the new Gauge the polar perturbation equations are much simpler and the trasformation to first order system is very easy.