Impact of Simultaneous Stellar Modeling Uncertainties on the Tip of the Red Giant Branch for Axion-Election Coupling
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| Format: | Preprint |
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2023
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| _version_ | 1866908751837003776 |
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| author | Dennis, Mitchell T. Sakstein, Jeremy |
| author_facet | Dennis, Mitchell T. Sakstein, Jeremy |
| contents | We present a novel method for incorporating the effects of stellar modeling uncertainties into constraints on the axion-electron coupling constant found using the observed calibration of the tip of the red giant branch (TRGB) I band magnitude $M_I$.~We simulate grids of models with varying initial stellar mass, helium abundance, metallicity, and axion-electron coupling $α_{26}= 10^{26} g^2_{ae}/4π$ but different (fixed) mixing lengths and mass loss efficiencies.~We then train separate machine learning emulators to predict $M_I$ as a function of the varying parameters for each grid.~Our emulators enable the use of Markov Chain Monte Carlo simulations where $α_{26}$ is varied simultaneously with the stellar parameters.~One of our grids yields a bound $α_{26}\leq 0.75$ at the 95\% confidence limit, a factor of $\sim3.7$ weaker than previous bounds;~while the other grid yields $α_{26}\leq1.58$ at the 95\% confidence limit, a factor $\sim7.8$ weaker than previous bounds.~We demonstrate that the different values we find are due to covariances between stellar and axion physics that are not accounted for by single parameter variations.~Our results suggest that the bound on $α_{26}$ derived using empirical calibrations of the TRGB I band magnitude need to be reevaluated using simultaneous parameter variation.~Alternative methods that use the bolometric luminosity instead of $M_I$ are more robust because they are not reliant upon theoretical predictions of the effective temperature. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2305_03113 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | Impact of Simultaneous Stellar Modeling Uncertainties on the Tip of the Red Giant Branch for Axion-Election Coupling Dennis, Mitchell T. Sakstein, Jeremy High Energy Physics - Phenomenology Cosmology and Nongalactic Astrophysics Solar and Stellar Astrophysics General Relativity and Quantum Cosmology We present a novel method for incorporating the effects of stellar modeling uncertainties into constraints on the axion-electron coupling constant found using the observed calibration of the tip of the red giant branch (TRGB) I band magnitude $M_I$.~We simulate grids of models with varying initial stellar mass, helium abundance, metallicity, and axion-electron coupling $α_{26}= 10^{26} g^2_{ae}/4π$ but different (fixed) mixing lengths and mass loss efficiencies.~We then train separate machine learning emulators to predict $M_I$ as a function of the varying parameters for each grid.~Our emulators enable the use of Markov Chain Monte Carlo simulations where $α_{26}$ is varied simultaneously with the stellar parameters.~One of our grids yields a bound $α_{26}\leq 0.75$ at the 95\% confidence limit, a factor of $\sim3.7$ weaker than previous bounds;~while the other grid yields $α_{26}\leq1.58$ at the 95\% confidence limit, a factor $\sim7.8$ weaker than previous bounds.~We demonstrate that the different values we find are due to covariances between stellar and axion physics that are not accounted for by single parameter variations.~Our results suggest that the bound on $α_{26}$ derived using empirical calibrations of the TRGB I band magnitude need to be reevaluated using simultaneous parameter variation.~Alternative methods that use the bolometric luminosity instead of $M_I$ are more robust because they are not reliant upon theoretical predictions of the effective temperature. |
| title | Impact of Simultaneous Stellar Modeling Uncertainties on the Tip of the Red Giant Branch for Axion-Election Coupling |
| topic | High Energy Physics - Phenomenology Cosmology and Nongalactic Astrophysics Solar and Stellar Astrophysics General Relativity and Quantum Cosmology |
| url | https://arxiv.org/abs/2305.03113 |