2 research outputs found
3D-Spatiotemporal Forecasting the Expansion of Supernova Shells Using Deep Learning toward High-Resolution Galaxy Simulations
Supernova (SN) plays an important role in galaxy formation and evolution. In
high-resolution galaxy simulations using massively parallel computing, short
integration timesteps for SNe are serious bottlenecks. This is an urgent issue
that needs to be resolved for future higher-resolution galaxy simulations. One
possible solution would be to use the Hamiltonian splitting method, in which
regions requiring short timesteps are integrated separately from the entire
system. To apply this method to the particles affected by SNe in a
smoothed-particle hydrodynamics simulation, we need to detect the shape of the
shell on and within which such SN-affected particles reside during the
subsequent global step in advance. In this paper, we develop a deep learning
model, 3D-MIM, to predict a shell expansion after a SN explosion. Trained on
turbulent cloud simulations with particle mass M, the
model accurately reproduces the anisotropic shell shape, where densities
decrease by over 10 per cent by the explosion. We also demonstrate that the
model properly predicts the shell radius in the uniform medium beyond the
training dataset of inhomogeneous turbulent clouds. We conclude that our model
enables the forecast of the shell and its interior where SN-affected particles
will be present.Comment: 14 pages, 14 figures, 3 tables, accepted for MNRA
Surrogate Modeling for Computationally Expensive Simulations of Supernovae in High-Resolution Galaxy Simulations
Some stars are known to explode at the end of their lives, called supernovae
(SNe). The substantial amount of matter and energy that SNe release provides
significant feedback to star formation and gas dynamics in a galaxy. SNe
release a substantial amount of matter and energy to the interstellar medium,
resulting in significant feedback to star formation and gas dynamics in a
galaxy. While such feedback has a crucial role in galaxy formation and
evolution, in simulations of galaxy formation, it has only been implemented
using simple {\it sub-grid models} instead of numerically solving the evolution
of gas elements around SNe in detail due to a lack of resolution. We develop a
method combining machine learning and Gibbs sampling to predict how a supernova
(SN) affects the surrounding gas. The fidelity of our model in the thermal
energy and momentum distribution outperforms the low-resolution SN simulations.
Our method can replace the SN sub-grid models and help properly simulate
un-resolved SN feedback in galaxy formation simulations. We find that employing
our new approach reduces the necessary computational cost to 1 percent
compared to directly resolving SN feedback.Comment: 11 pages, 9 figures, Accepted for the NeurIPS 2023 AI4Science
Worksho