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
Signatures of Galactic Expansion in Gaia DR3: Implications for the JWST Early-Galaxy Puzzle
G. S. Karapetian, A. P. Mahtessian, L. E. Byzalov +2
Recent observations with the James Webb Space Telescope (JWST) of massive galaxies at ages below 1 Gyr pose a challenge to standard models of galaxy formation, which predict signif…
astro-ph.GA2025
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…