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Title:
Dependence of standardization parameters of type Iasupernova light curves on redshift
Creator:
Mahtessian, A. P. ; Karapetian, G. S. ; Hovhannisyan, M. A. ; Mahtessian, L. A.
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Uncontrolled Keywords:
Supernovae Ia ; Luminosity standardization ; Cosmological Parameters ; Cosmology
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Abstract:
The paper shows that the parameters X1 and C used to standardize the luminosity of type Ia supernovae in the SALT2 model are highly dependent on redshift. This leads to the fact that during standardization, with increasing z, the average absolute stellar magnitude of type Ia supernovae artificially increases and, therefore, for a given apparent magnitude, we attribute to them, on average, a greater distance than they actually have. And therefore it is believed that they are receding with acceleration. Therefore, such standardization is unsuitable for measuring distances to type Ia supernovae. If the standardization parameter (−αX1 + βC) is replaced by the redshift-dependent parameter (ϵz), then the parameter ΩΛ turns into 0 in the ΛCDM model.