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ID: 9922.0, MPI für Astrophysik / Stellar Astrophysics
Simulating the dynamics of relativistic stars via a light-cone approach
Authors:Siebel, F.; Font, J. A.; Müller, E.; Papadopoulos, P.
Language:English
Date of Publication (YYYY-MM-DD):2002
Title of Journal:Physical Review D
Journal Abbrev.:Phys. Rev. D
Volume:65
Issue / Number:6
Start Page:064038-1
End Page:064038-15
Sequence Number of Article:064038
Review Status:Peer-review
Audience:Experts Only
Abstract / Description:We present new numerical algorithms for the coupled Einstein- perfect-fluid system in axisymmetry. Our framework uses a foliation based on a family of light cones, emanating from a regular center, and terminating at future null infinity. This coordinate system is well adapted to the study of the dynamical spacetimes associated with isolated relativistic compact objects such as neutron stars. In particular, the approach allows the unambiguous extraction of gravitational waves at future null infinity and avoids spurious outer boundary reflections. The code can accurately maintain long-term stability of polytropic equilibrium models of relativistic stars. We demonstrate global energy conservation in a strongly perturbed neutron star spacetime, for which the total energy radiated away by gravitational waves corresponds to a significant fraction of the Bondi mass. As a first application we present results in the study of pulsations of axisymmetric relativistic stars, extracting the frequencies of the different fluid modes in fully relativistic evolutions of the Einstein- perfect-fluid system and making a first comparison between the gravitational news function and the predicted wave using the approximations of the quadrupole formula.
External Publication Status:published
Document Type:Article
Communicated by:N. N.
Affiliations:MPI für Astrophysik/Hydrodynamics
Identifiers:ISI:000174548100073
ISSN:0556-2821
URL:http://ojps.aip.org/getabs/servlet/GetabsServlet?p...
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