In article <
Y4OdneM55LfKpr_DnZ2dnUU7-SHNnZ2d@giganews.com>, "Richard D.
Saam" <
rdsaam@att.net> writes:=20
Early-type Host Galaxies of Type Ia Supernovae. II. Evidence
for Luminosity Evolution in Supernova Cosmology https://arxiv.org/abs/1912.04903
=20
The authors statement:
'We argue, therefore, that this systematic bias must be considered
in detail in SN cosmology before proceeding to the details
of the dark energy.'
=20
Such a statement is revolutionary on its face.
No. One ALWAYS has to take systematic bias into account when analysing=20 data. Perhaps they have found something new. If it holds up, then it=20
has to be taken into account.
Is this going to bend the arc of cosmological science?
By itself, no. There seems to be a widespread misconception that the=20
ONLY evidence for a positive cosmological constant or (a stronger claim)=20
an accelerating universe is the supernova data. The concordance model=20
is called the concordance model because many different lines of evidence=20 point to the same values of the cosmological parameters. The=20
accelerating universe is still there even completely ignoring the=20
supernova data. These days, JUST THE CMB tells us that the universe is=20 accelerating. So, if this effect affects the conclusions from the=20
supernova data so much that an accelerating universe is ruled out (as=20
the hype surrounding this paper sometimes implies), then one has to=20
explain why essentially ALL THE OTHER COSMOLOGICAL TESTS ARE WRONG. Not=20 only that, they are all wrong but just happen to give the same result.
Note that the quote above is=20
We argue, therefore, that this systematic bias must be considered
in detail in SN cosmology before proceeding to the details of the=20
dark energy.'
DETAILS. Of course it has to be taken into account. Whether it would=20
lead to a conclusion incompatible with other tests is a different=20
question. Even if it does, the interpretation is probably not that=20
there is not a cosmological constant.
See also my reply to Alex (and, indeed, the post and all the comments)
at=20
https://telescoper.wordpress.com/2020/01/14/luminosity-evolution-in-type= -1a-supernovae/
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