A cosmology-independent calibration of type Ia supernovae data
  Recently, the common methodology used to transform type Ia supernovae (SNe
Ia) into genuine standard candles has been suffering criticism. Indeed, it
assumes a particular cosmological model (namely the flat $\Lambda$CDM) to
calibrate the standardisation corrections parameters, i.e. the dependency of
the supernova peak absolute magnitude on its colour, post-maximum decline rate
and host galaxy mass. As a result, this assumption could make the data
compliant to the assumed cosmology and thus nullify all works previously
conducted on model comparison. In this work, we verify the viability of these
hypotheses by developing a cosmology-independent approach to standardise SNe Ia
data from the recent JLA compilation. Our resulting corrections turn out to be
very close to the $\Lambda$CDM-based corrections. Therefore, even if a
$\Lambda$CDM-based calibration is questionable from a theoretical point of
view, the potential compliance of SNe Ia data does not happen in practice for
the JLA compilation. Previous works of model comparison based on these data do
not have to be called into question. However, as this cosmology-independent
standardisation method has the same degree of complexity than the
model-dependent one, it is worth using it in future works, especially if
smaller samples are considered, such as the superluminous type Ic supernovae.
