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The European High Performance Computing Joint Undertaking (EuroHPC JU)

NEPTUNE: NEutrino Processes and Transport Unveiling Neutron star merge Events

Awarded Resources (in core hours)
System Partition
10 May 2023 - 9 May 2024
Allocation Period

Multimessenger (MM) astrophysics promises to answer some of the most intriguing open questions in Physics, including the nature of gravity, the properties of nuclear matter, the origin of the heaviest elements.

The interpretation of MM observations of binary neutron star (BNS) mergers (intrinsically multidimensional, multiscale, multiphysics processes) crucially relies on detailed theoretical models. These are the only way to connect the observations to their astrophysical sources, and eventually to the laws of Nature governing them. HPC resources are necessary to produce models that contain the most relevant physics (including gravitation, nuclear and neutrino physics).

In this project, we want to go beyond the state of the art in the modelling of BNS mergers with respect to the realism of neutrino transport and the explicit inclusion of muonic degrees of freedom.

We have a twofold goal: to study BNS mergers using the best input physics and numerical schemes available to provide accurate predictions for the expected MM signals; and to explore the sensitivity of BNS observables to microphysics by comparing with simulations performed with different transport schemes/neutrino physics.

Our results will challenge some of the most relevant studies in the field and qualitatively improve our confidence in interpreting multimessenger observations.