Prof. Anupam Bharadwaj "Precision stellar astrophysics to probe the rate of cosmic expansion"
Автор: WST_2MTDT
Загружено: 2025-08-04
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Prof. Anupam Bharadwaj gave a talk on July 15th 2025, at the WST 2MTDT series with the following abstract: "The present expansion rate of the Universe, the Hubble constant, is a key cosmological parameter which can provide stringent constraints for the nature of the dark energy that is known to be accelerating the cosmos. Currently, the Hubble constant values based on a variety of standard candles observed with the Gaia/Hubble/James Webb space telescopes and ground-based telescopes, are in an intriguing discord with the measurement from the Planck space mission. I will discuss the photometric and spectroscopic observations of pulsating variable stars like Cepheids, Miras, and RR Lyrae, which provide the calibration of the first step of the distance ladder used to determine the Hubble constant. I will present a new determination of the Hubble constant based on Mira variables in star clusters discussing the importance of independent calibrations using stellar populations of different ages and metallicities in evaluating the Hubble tension."
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