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High-Order Numerical-Relativity Simulations of Binary Neutron Stars

Radice, David and Rezzolla, Luciano and Galeazzi, Filippo (2015) High-Order Numerical-Relativity Simulations of Binary Neutron Stars. In: Numerical Modelling of Space Plasma Flows: Astronum 2014. Astronomical Society of the Pacific Conference Series. No.498. Astronomical Society of the Pacific , San Francisco, CA, pp. 121-126. ISBN 978-1-58381-880-0.

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We report simulations of the inspiral and merger of binary neutron stars performed with WhiskyTHC, the first of a new generation of numerical relativity codes employing higher than second-order methods for both the spacetime and the hydrodynamic evolution. We find that the use of higher-order schemes improves substantially the quality of the gravitational waveforms extracted from the simulations when compared to those computed using traditional second-order schemes. The reduced de-phasing and the faster convergence rate allow us to estimate the phase evolution of the gravitational waves emitted, as well as the magnitude of finite-resolution effects, without the need of phase- or time-alignments or rescalings of the waves, as sometimes done in other works. Furthermore, by using an additional unpublished simulation at very high resolution, we confirm the robustness of our high convergence order of 3.2.

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Radice, David0000-0001-6982-1008
Additional Information:© 2015 Astronomical Society of the Pacific. We thank W. Kastaun for providing the primitive recovery routine and I. Hawke, S. Bernuzzi, D. Alic, R. Haas and K. Takami for useful discussions. Partial support comes from the Sherman Fairchild Foundation, the DFG grant SFB/Transregio 7, by “NewCompStar”, COST Action MP1304, and by the Helmholtz International Center for FAIR. The calculations were performed on SuperMUC at the LRZ, on Datura at the AEI, and on LOEWE in Frankfurt.
Group:TAPIR, Walter Burke Institute for Theoretical Physics
Funding AgencyGrant Number
Sherman Fairchild FoundationUNSPECIFIED
Deutsche Forschungsgemeinschaft (DFG)SFB/Transregio 7
Helmholtz International Center for FAIRUNSPECIFIED
Series Name:Astronomical Society of the Pacific Conference Series
Issue or Number:498
Record Number:CaltechAUTHORS:20151201-144111842
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:62514
Deposited By: Tony Diaz
Deposited On:03 Dec 2015 02:56
Last Modified:09 Mar 2020 13:19

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