![]() ![]() PUBLICATIONS PRODUCED AS A RESULT OF THIS RESEARCH This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria. There will also be benefits to the broader scientific community: both the new simulation tools and the output data sets will be made public. ![]() Scientific visualizations from the proposed simulations will be used as a vehicle for public outreach events on science and computing through annual community-wide public exhibits. Further educational benefits will accrue through improvements in undergraduate science education. It will also provide material for educating students in multimessenger astronomy and high-performance computing, and enhance public outreach through a variety of channels, including both an REU program in multimessenger astronomy and a summer program giving underrepresented minority undergraduates experience in physics research. In addition to developing new algorithms, this award will be used train a postdoc and a graduate student in highly-parallelized computing. On the other hand, multipatch method, while computational more complex than single spherical patches, are ideal for simulations of jets around these compact objects. This project is to develop new coding infrastructures to overcome these limitations and apply them to perform highly-accurate, but also very fast simulations of hypermassive neutron star remnants. However, the often severe Courant stability limitation of these methods have made them prohibitively expensive. Spherical polar grids are optimally suited for a host of applications in relativistic astrophysics. By choosing coordinate topologies that mirror the approximate symmetries, or multiple coordinate patches, one can obtain higher simulation accuracies at lower computational costs. On the other hand, many astrophysical systems exhibit approximate symmetries that can be leveraged to reduce the total computational cost. Simulations of a wide range of astrophysical events, including strong sources of both electromagnetic and gravitational wave signals, will require numerical tools that can handle an increasingly wide range of microphysical treatments, characteristic scales, and levels of complexity. Magnetic fields underly much of what happens because they support both accretion and jets. Particular attention will be paid to the roles of the equation of state and total mass as determinants of final properties such as magnetic fields. The effort also includes development of new computational tools required for these calculations. This award will fund a collaborative research effort at the Rochester Institute of Technology and the Johns Hopkins University into the latter stages of neutron star mergers, in particular long-lived hypermassive neutron stars that collapse to black holes and stable neutron stars. The rapidly increasing rate of new GW detections by LIGO, VIRGO, and other upcoming similar interferometers and major astronomical facilities is expected to bring an unprecedented wealth of observational evidence from these sources in the near future. The recent observations of a binary neutron star merger using both gravitational wave interferometers and the full spectrum of electromagnetic telescopes has initiated the age of multimessenger astronomy and astrophysics. This award supports research in relativity and relativistic astrophysics and it addresses the priority areas of NSF's "Windows on the Universe" Big Idea. WoU-Windows on the Universe: T, Gravity Theory Primary Place of Performance Congressional District: Manuela Campanelli (Principal Investigator) Yosef Zlochower (Co-Principal Investigator).Pedro Marronetti (703)292-7372 PHY Division Of Physics MPS Direct For Mathematical & Physical Scien Collaborative Research: Deploying Curvilinear Coordinate and Multipatch Methods on Neutron Star Mergers NSF Org: ![]()
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