RE: https://mastodon.social/@pomarede/116809987222569057
In a study published today in Nature, two researchers argue galaxies align in enormous filaments even on scales where the cosmos should appear smooth and uniform.
RE: https:// mastodon.social/@pomarede/1168 09987222569057 In a
Submitted 4 weeks ago by 
pomarede@mastodon.social to cosmology@fedigroups.social
@pomarede
"Detection of anisotropic cosmic structures on a gigaparsec scale"
#SylosLabini + #MarcoGaloppo claim 1 Gpc scale anistropies in #DESI data unexpected at 3 sigma in #LCDM . The paper is not yet on #ArXiv , so we can only go by the pop-science coverage for the moment. The "Science" article has expected comments from expected people :).
@cosmology
@boud @pomarede @cosmology
'Nature' is not good enough for papers that challenge mainstream cosmology.
'arXiv' is not good enough for papers that challenge mainstream cosmology.
'MNRAS' is not good enough for papers that challenge mainstream cosmology.
How about a scientific discussion instead of basing judgement on where the paper is posted?
A rescaling of the distance measure (luminosity vs comoving distance) does not affect homogeneity, isotropy, nor angular fluctuations. The 'errors' (if any) made by Sylos Labini++ don't change their conclusion.
Sawala's paper only shows consistency of the isotropy assumption with the isotropic simulation of FLAMINGO, i.e. it's a tautology.
@cosmology @pomarede @redshiftdrift
In their article that is *still* not on #ArXiv, looks like #SylosLabini+#Galoppo made two elementary mistakes.
@TillSawala has reanalysed the data, and presented a convincing case that SylosLabini+Galoppo forgot about #little_h and accidentally used #LuminosityDistance s instead of #ComovingDistance s [2]. See Fig 9, and p14 (15th page) of the pdf.
So much for #Nature's peer review standards ...
#TillSawala
[2] #ArXiv_2607_01172 https://arxiv.org/abs/2607.01172
@cosmology
For non-cosmologists:
[3] #ComovingDistance: https://en.wikipedia.org/wiki/Comoving_and_proper_distances
[4] #LuminosityDistance: https://en.wikipedia.org/wiki/Luminosity_distance
[5] #little_h https://en.wikipedia.org/wiki/Hubble%27s_law#Dimensionless_Hubble_constant