Berlin 2015 – wissenschaftliches Programm

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GR: Fachverband Gravitation und Relativitätstheorie

GR 16: Numerical Relativity

GR 16.7: Vortrag

Donnerstag, 19. März 2015, 17:30–17:50, H 2013

Dynamical simulations of neutron star spacetimes with conservative mesh refinement — •Tim Dietrich¹, Sebastiano Bernuzzi^2,3, Maximiliano Ujevic⁴, and Bernd Brügmann¹ — ¹Theoretical Physics Institute, University of Jena, 07743 Jena, Germany — ²TAPIR, California Institute of Technology, 1200 E California Blvd,Pasadena, California 91125, USA — ³DiFeST, University of Parma, and INFN Parma, I-43124 Parma, Italy — ⁴Centro de Ciencias Naturais e Humanas, Universidade Federal do ABC, 09210-170, Santo Andre, Sao Paulo, Brazil

The most recent and improved general-relativistic grid-based simulations of neutron star systems produced with our code BAM are presented. We focus in particular on the adaptive mesh refinement (AMR) implementation. AMR is an important tool to reduce computational costs and still to resolve multiple scales: the stars interiors, the orbital strong field region, and the radiation zone. Here, the use of a conservative AMR enforcing mass conservation over refinement boundaries is investigated. We show the usage during (i) a variety of single neutron star test spacetimes, (ii) the gravitational collapse of rotating neutron stars to black holes, and (iii) the ejection of material in a binary neutron star system. According to our results accurate simulations beyond the merger should include a conservative mesh refinement.