Principal Investigators: Hanns Ruder, Wilhelm Kley

*
The goal of this project is the analysis of the oscillation modes of rotating
Neutron Stars. We plan to go beyond the linear studies and follow the
oscillations through fully non-linear methods, including the full variation of
the space-time. We intend to extract accurate oscillation frequencies
and eigenfunctions, and obtain limits on the non-linear saturation amplitudes
of the oscillations.
*

Newly formed or continuously accreting isolated Neutron Stars are potential sources of gravitational waves, with frequencies in the kHz range. The oscillations of such single stars can be analyzed by different types of methods, eg. linear or non-linear. During the first funding period the focus of this project has been on the analysis of the linear oscillations of Neutron Stars. In this approach the departure from the equilibrium of NS is modeled using perturbative methods. In three different complementary approaches (a modal-analysis, a time evolution of the linearized equation in the Cowling approximation, and a time evolution of the full linearized equations for slow rotation) we have studied the modes of oscillations of rotating NS. In the next period we plan to go beyond the linear analysis and study, through fully non-linear methods, the oscillation modes of rotating single NS. We plan to extract accurate oscillation frequencies and eigenfunctions, and obtain limits on the non-linear saturation amplitudes of the oscillations.

Former Associates | |||

Efstratios Boutloukos | Student, 2003-2006 | ||

Erich Gaertig | PhD Student, 2003-2006 | ||

Michael Hary | Student, 2003-2006 | ||

Wilhelm Kley | Professor, PI 2003-2006 | ||

Isabel Rica-Mendez | PhD Student, 2003-2006 | ||

Hanns Ruder | Professor, PI 2003-2006 | ||

Erik Schnetter | PhD Student, 2003-2003 |

[1]
*Perturbations of slowly rotating relativistic stars*

I. Rica Mendez,
AIP, Converence Proceedings (2006)

[2]
*Characteristic oscillation modes of rapidly rotating neutron stars*,

S. Boutloukos and Nollert, H.-P.,
Submitted to Phys. Rev. D

[3]
*Fluid modes of axisymmetric neutron stars*

S. Boutloukos,
Journal of Physics Conferences Series, vol 8, p81 (2005)

[4]
*Rotating relativistic stars: two problems*

M. Vavoulidis, K. D. Kokkotas,
Journal of Physics Converence Series, Vol. 8, p71 (2005)

[5]
*Time evolution of Perturbations of rotating Neutron Stars in the Cowling Approximation*

E. Gaertig,
PhD thesis

[6]
*Oscillation Modes of rotating Neutron Stars including Metric Perturbations*

I. Rica Mendez,
PhD thesis

[7]
*Oscillation Modes of rotating Neutron Stars*

E. Boutloukos,
PhD thesis