Περίληψη: 
The Tip of the Red Giant Branch (TRGB) is a critical observable for calibrating the cosmic distance ladder and measuring the local Hubble constant. Here I will present a comprehensive analysis of TRGB luminosity uncertainties, using the largest to date grid of million stellar models covering a wide range of masses (0.8 – 1.4 M_sun) and metallicities (Z = 0.0001 – 0.02). Through Monte Carlo simulations, I will explain how to quantify the impact of input physics systematics on the TRGB brightness considering the most extensive list of input physics in the literature, such as opacity, composition, diffusion, convection, nuclear reaction rates etc., and I will discuss its effect on the bolometric luminosity, effective temperature and observed magnitudes.

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