Project B2;     (2003 - 2006)

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Oscillation Modes of Rotating Neutron Stars

    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.

Researchers


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

Publications

[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)

Theses

[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