3 papers
astro-ph.HE2025
Some problems associated with the standardization of the light curve of type 1a supernovae
A. P. Mahtessian, G. S. Karapetian, H. F. Khachatryan +4
We show that the parameters used to standardize the luminosity of Type 1a supernovae in the SALT2 and SiFTO models are strongly dependent on the redshift z. Consequently, when stan…
astro-ph.GA2025★ 1 cited
Evidence of Galactic Center Expansion from Gaia DR3 Stars along the South North Axis: Implications for the JWST Early Galaxy Problem
G. S. Karapetian, L. E. Byzalov, M. A. Hovhannisyan +2
Recent observations with the James Webb Space Telescope (JWST) have revealed massive, evolved galaxies only a few hundred million years after the Big Bang, challenging standard cos…
astro-ph.CO2022
The evolving absolute magnitude of type 1a supernovae and its critical impact on the cosmological parameters
A. P. Mahtessian, G. S. Karapetian, M. A. Hovhannisyan +1
In this work, a computer optimization model has been developed that allows one to load the initial observation data of supernovae 1a into a table and, simply, by searching for the…