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The Hubble constant tension: new insights from stellar pulsation models.
Marconi M., De Somma G., Molinaro R.
One of the most debated topic in the current astrophysical literature is the discrepancy, at the level of 4 to 6, between the Hubble constant value estimated locally through the SNIa distance scale calibrated with Classical Cepheids and the cosmological value obtained through the study of the Cosmic Microwave Background (CMB) radiation. This is called the Hubble constant tension and represents an important challenge both for cosmologists and for experts of distance indicators. From the local universe point of view, possible residual systematic effects in the calibration of the extragalactic distance scale are invoked as contributors to the tension. In this context current predictions of Cepheid models combined with the most recent Gaia parallaxes are discussed to cast light on the impact of possible variations in physical and chemical parameters of these standard candles.