Hints for possible low redshift oscillation around the best fit
  $\Lambda$CDM model in the expansion history of the Universe
  We search for possible deviations from the expectations of the concordance
$\Lambda$CDM model in the expansion history of the Universe by analysing the
Pantheon Type Ia Supernovae (SnIa) compilation along with its Monte Carlo
simulations using redshift binning. We demonstrate that the redshift binned
best fit $\Lambda$CDM matter density parameter $\Omega_{0m}$ and the best fit
effective absolute magnitude $\cal M$ oscillate about their full dataset best
fit values with considerably large amplitudes. Using the full covariance matrix
of the data taking into account systematic and statistical errors, we show that
at the redshifts below $z\approx0.5$ such oscillations can only occur in 4 to
5$\%$ of the Monte Carlo simulations. While statistical fluctuations can be
responsible for this apparent oscillation, we might have observed a hint for
some behaviour beyond the expectations of the concordance model or a possible
additional systematic in the data. If this apparent oscillation is not due to
statistical or systematic effects, it could be due to either the presence of
coherent inhomogeneities at low $z$ or due to oscillations of a quintessence
scalar field.
