Is $π΄_π©$ really a constant?
David Benisty Β· 2023
π π΅ is the Supernova absolute magnitude.Ref. [1] isolates the distance ladder π πΏ (π§) from the Baryon Acoustic Oscillations (BAO) and from the Type Ia supernova data to determine π π΅ .The degeneracy between the absolute magnitude and the Hubble constant π» 0 for the supernova data is replaced by a degeneracy between π π΅ and the sound horizon π π .Since the data is for certain redshifts, the Gaussian processes (GP) regression extrapolates the values for the whole redshift range.By canceling the distance ladder, the GP gives π π΅ = -19.25 Β± 0.39 as a mean for the full distribution when using the sound horizon from late time measurements.The estimations provide up to 1 π possibility of a nuisance parameter presence πΏπ π΅ (π§) at higher redshifts.