Sapphire is a differentiable JAX-based semi-analytic model that computes exact Jacobians of galaxy evolution equations, performs sensitivity analyses and Bayesian inference, and indicates galaxies self-regulate star formation mainly via preventative feedback.
As a baseline, the black line compares each autodiff Jacobian to the “true” autodiff Jacobian with the tightesta tol =r tol = 10−12
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Introducing sapphire: Towards Hybrid Physics-Informed, Data-Driven Modeling of Galaxy Formation
Sapphire is a differentiable JAX-based semi-analytic model that computes exact Jacobians of galaxy evolution equations, performs sensitivity analyses and Bayesian inference, and indicates galaxies self-regulate star formation mainly via preventative feedback.