Supernovae and photon frequency shift induced by the Standard-Model
  Extension
  We revisit for 714 SNeIa the discrepancy between the red-shift associated to
the distance modulus $\mu$ and the spectroscopic red-shift. Previous work has
shown that the total red-shift $z$ might be a combination of the expansion
red-shift $z_{\rm C}$ and of a static, blue or red shift $z_{\rm LSV}(r)$, $r$
being the comoving distance. The latter is due to the energy non-conservation
of the photon propagating through Electro-Magnetic (EM) background fields (host
galaxy, intergalactic and Milky Way), under Lorentz(-Poincar\'e) Symmetry
Violation (LSV), associated to the Standard-Model Extension (SME). The
non-conservation stems from the vacuum expectation value of the vector and
tensor LSV fields. For zero radiation $\Omega_{\rm rad}$ and curvature
$\Omega_{\rm k}$ densities, and matter density $\Omega_m = 0.28$, the SN1a
positions in the ($\mu$, z) plan are recovered according to the different
strengths, orientations, alignments and space-time dependencies of the EM
fields and LSV components. The LSV vacuum energy may be thus tantamount to
$\Omega_\Lambda \simeq 0.7$, but unrelated to an accelerated expansion. We
present models with red or blue-shifts $z_{\rm LSV}$, below $10\%$ of $z$. The
$\nu$ frequency variation is below $10^{-19} \Delta \nu/\nu$ per m.
