Investigating dark energy by electromagnetic frequency shifts II: the Pantheon+ sample by Giuseppe Sarracino et al. on Monday 21 November

Following results presented in Eur. Phys. J. Plus, {\bf 137} (2022) 253 by

the same authors, we investigate the observed red shift $z$, working under the

hypothesis that it might be composed by the expansion red shift $z_{\rm C}$ and

an additional frequency shift $z_{\rm S}$, towards the red or the blue, due to

Extended Theories of Electromagnetism (ETE). We have tested this prediction

considering the novel Pantheon+ Catalogue, composed by 1701 light curves

collected by 1550 SNe Ia, and 16 BAO data, for different cosmological models

characterised by the absence of a dark energy component. In particular, we

shall derive which values of $z_{\rm S}$ match the observations, comparing the

new results with the ones obtained considering the older Pantheon Catalogue. We

find interesting differences in the resulting $z_{\rm S}$ distributions,

highlighted in the text. Later, we also add a discussion regarding Extended

Theories of Gravity and how to incorporate them in our methodology.

arXiv: http://arxiv.org/abs/http://arxiv.org/abs/2211.11438v1