Intensity interferometry can measure Red Clump star angular diameters to <1% precision in short exposures, providing independent validation for surface-brightness-color relations in the distance ladder.
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JWST TRGB distances to 10 SN Ia hosts update calibrations for 11 SNe yielding H0 of 68.4-69.6 km/s/Mpc and show modest shifts when combined with prior HST data.
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Validating the Angular Sizes of Red Clump Stars with Intensity Interferometry
Intensity interferometry can measure Red Clump star angular diameters to <1% precision in short exposures, providing independent validation for surface-brightness-color relations in the distance ladder.