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title: "Neutrinos in colliding neutron stars and black holes" | ||
authors: "Foucart, Francois" | ||
jref: | ||
doi: | ||
date: 2024-10-04 | ||
arxiv: "2410.03646" | ||
abstract: | | ||
In this chapter, we provide an overview of the physics of colliding | ||
black holes and neutron stars and of the impact of neutrinos on | ||
these systems. Observations of colliding neutron stars play an | ||
important role in nuclear astrophysics today. They allow us to study | ||
the properties of cold nuclear matter and the origin of many heavy | ||
elements (gold, platinum, uranium). We show that neutrinos | ||
significantly impact the observable signals powered by these events | ||
as well as the outcome of nucleosynthesis in the matter that they | ||
eject into the surrounding intergalactic medium. | ||
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title: "SpECTRE: A task-based discontinuous Galerkin code for relativistic astrophysics" | ||
authors: | ||
- "Kidder, Lawrence E." | ||
- "Field, Scott E." | ||
- "Foucart, Francois" | ||
- "Schnetter, Erik" | ||
- "Teukolsky, Saul A." | ||
- "Bohn, Andy" | ||
- "Deppe, Nils" | ||
- "Diener, Peter" | ||
- "Hébert, François" | ||
- "Lippuner, Jonas" | ||
- "Miller, Jonah" | ||
- "Ott, Christian D." | ||
- "Scheel, Mark A." | ||
- "Vincent, Trevor" | ||
jref: "J.Comput.Phys. 335, 7061 (2017)" | ||
doi: "10.1016/j.jcp.2016.12.059" | ||
date: 2016-08-31 | ||
arxiv: "1609.00098" | ||
abstract: | | ||
We introduce a new relativistic astrophysics code, SpECTRE, that | ||
combines a discontinuous Galerkin method with a task-based | ||
parallelism model. SpECTRE's goal is to achieve more accurate | ||
solutions for challenging relativistic astrophysics problems such as | ||
core-collapse supernovae and binary neutron star mergers. The | ||
robustness of the discontinuous Galerkin method allows for the use | ||
of high-resolution shock capturing methods in regions where | ||
(relativistic) shocks are found, while exploiting high-order | ||
accuracy in smooth regions. A task-based parallelism model allows | ||
efficient use of the largest supercomputers for problems with a | ||
heterogeneous workload over disparate spatial and temporal scales. | ||
We argue that the locality and algorithmic structure of | ||
discontinuous Galerkin methods will exhibit good scalability within | ||
a task-based parallelism framework. We demonstrate the code on a | ||
wide variety of challenging benchmark problems in (non)-relativistic | ||
(magneto)-hydrodynamics. We demonstrate the code's scalability | ||
including its strong scaling on the NCSA Blue Waters supercomputer | ||
up to the machine's full capacity of <math altimg="si1.gif" | ||
display="inline" | ||
overflow="scroll"><mn>22</mn><mo>,</mo><mn>380</mn></math> nodes | ||
using <math altimg="si2.gif" display="inline" | ||
overflow="scroll"><mn>671</mn><mo>,</mo><mn>400</mn></math> threads. | ||
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