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Multipole Moments of numerical spacetimes
George Pappas, Theocharis A Apostolatos
In this article we present some recent results on identifying correctly the relativistic multipole moments of numerically constructed spacetimes, and the consequences that this cor…
An all-purpose metric for the exterior of any kind of rotating neutron star
George Pappas, Theocharis A. Apostolatos
We have tested the appropriateness of two-soliton analytic metric to describe the exterior of all types of neutron stars, no matter what their equation of state or rotation rate is…
Revising the multipole moments of numerical spacetimes, and its consequences
George Pappas, Theocharis A. Apostolatos
Identifying the relativistic multipole moments of a spacetime of an astrophysical object that has been constructed numerically is of major interest, both because the multipole mome…
Matching of analytical and numerical solutions for neutron stars of arbitrary rotation
George Pappas
We demonstrate the results of an attempt to match the two-soliton analytical solution with the numerically produced solutions of the Einstein field equations, that describe the spa…
What can quasi-periodic oscillations tell us about the structure of the corresponding compact objects?
George Pappas
We show how one can estimate the multipole moments of the space-time, assuming that the quasi-periodic modulations of the X-ray flux (quasi-periodic oscillations), observed from ac…