[en] The Hubble Tension is a discrepancy between the measurements of the Hubble constant, which describes the expansion rate of the Universe, derived from cosmological observations. This is an important tension because the value from the current model of cosmology Lambda Cold Dark Matter has a 5-sigma discrepancy compared to the latest type Ia supernovae measurements. One way to address the Hubble tension is by using Cepheid variable stars, which pulsate with a period that is related to their intrinsic luminosity. Cepheids are used as "standard candles" to measure distances to nearby galaxies, and their period-luminosity relation can be used to calibrate other distance indicators. Nestled in the mountains of Northern India, and employing a 4-metre rotating liquid-mercury primary mirror, the 4m international liquid mirror telescope is well-suited to study the photometric variability of Cepheids over a multi-year time span.
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
Grewal, Baldeep; University of British Columbia, Vancouver, Canada
Ailawadhi, Bhavya; Aryabhatta Research Institute of Observational sciencES, Nainital, India ; Deen Dayal, Upadhyay Gorakhpur University, Gorakhpur, India
Akhunov, Talat; National University of Uzbekistan, Tashkent, Uzbekistan ; Ulugh Beg Astronomical Institute, Tashkent, Uzbekistan
Borra, Ermanno; Laval University, Quebec, Canada
Dubey, Monalisa; Aryabhatta Research Institute of Observational sciencES, Nainital, India ; Mahatma Jyotiba Phule Rohilkhand University, Bareilly, India
Dukiya, Naveen; Aryabhatta Research Institute of Observational sciencES, Nainital, India ; Mahatma Jyotiba Phule Rohilkhand University, Bareilly, India
Fu, Jiuyang; University of British Columbia, Vancouver, Canada
Hickson, Paul; University of British Columbia, Vancouver, Canada
Kumar, Brajesh; Aryabhatta Research Institute of Observational sciencES, Nainital, India
Misra, Kuntal; Aryabhatta Research Institute of Observational sciencES, Nainital, India
Negi, Vibhore; Aryabhatta Research Institute of Observational sciencES, Nainital, India ; Deen Dayal, Upadhyay Gorakhpur University, Gorakhpur, India
Pranshu, Kumar; Aryabhatta Research Institute of Observational sciencES, Nainital, India ; University of Calcutta, Kolkata, India
Sun, Ethen; University of British Columbia, Vancouver, Canada
Surdej, Jean ; Université de Liège - ULiège > Département d'astrophysique, géophysique et océanographie (AGO) ; Liège University, Belgium
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