BibTeX

@article{2507.05060v2,
Author        = {Berkay Gunes and Sven Buder and Tobias Buck},
Title         = {A COMPASS to Model Comparison and Simulation-Based Inference in Galactic
  Chemical Evolution},
Eprint        = {2507.05060v2},
ArchivePrefix = {arXiv},
PrimaryClass  = {astro-ph.GA},
Abstract      = {We present COMPASS, a novel simulation-based inference framework that
combines score-based diffusion models with transformer architectures to jointly
perform parameter estimation and Bayesian model comparison across competing
Galactic Chemical Evolution (GCE) models. COMPASS handles high-dimensional,
incomplete, and variable-size stellar abundance datasets. Applied to
high-precision elemental abundance measurements, COMPASS evaluates 40
combinations of nucleosynthetic yield tables. The model strongly favours
Asymptotic Giant Branch yields from NuGrid and core-collapse SN yields used in
the IllustrisTNG simulation, achieving near-unity cumulative posterior
probability. Using the preferred model, we infer a steep high-mass IMF slope
and an elevated Supernova Ia normalization, consistent with prior solar
neighbourhood studies but now derived from fully amortized Bayesian inference.
Our results demonstrate that modern SBI methods can robustly constrain
uncertain physics in astrophysical simulators and enable principled model
selection when analysing complex, simulation-based data.},
Year          = {2025},
Month         = {Jul},
Url           = {http://arxiv.org/abs/2507.05060v2},
File          = {2507.05060v2.pdf}
}