++ Video is visually appealing, compact (28'). Tries to present the question of finiteness || infiniteness of Universe within the context of relativistic #cosmology. Intros to 2D #topology + #curvature are fair. Publicity for my group's research is nice :).
The relation to 3D topo+curv is absent; there are several bloopers in the narration.
#Galaxies#HighRedshift#LCDM#CMB
"Candidate Galaxies at z ~ 11.3-21.8 and beyond: results from JWST's public data taken in its first year"
<<The existence of a large number of galaxies at z ~ 17.3 is [...] in conflict with the determination of z_reionization = 7.64 based on the CMB anisotrophy measurements of the Planck mission.">>
A spherical shell-like structure 1 billion light-years in diameter named Ho’oleilana is discovered in the distribution of relatively nearby galaxies. We posit this is the 1st observation of an individual Baryon Acoustic Oscillation (BAO).
Acoustic waves generated in the hot plasma of the early universe became imprinted in baryon fluctuations. The prediction was made in 1970 by Jim Peebles and others. Indirect evidence of the BAO phenomenom came in 2005 by observing a peak in the pair-wise separations of galaxies.
By contrast, the discovery of Ho'oleilana represents the 1st direct evidence of a BAO, as an individual entity and a new confirmation of the standard model of cosmology.
A discovery made 53 years after the prediction - that's more time elapsed than for e.g. Higgs and his boson!
Ho'oleilana was found unexpectedly in the distribution of galaxies of the Cosmicflows-4 Catalog, within its SDSS PV "Peculiar Velocities" subsample of early-type galaxies, derived from fundamental plane measurements.
The cosmography of Ho'oleilana is pretty amazing: its shell includes some of the largest known structures of the universe: the Sloan Great Wall, CfA Great Wall, Hercules Supercluster, Corona-Borealis Supercluster... At its core is the Boötes Supercluster.
A video visualization of the cosmography of Ho'oleilana is part of the paper. Major components in proximity to the shell are highlighted and identified by name. The historic Boötes Void lies interior to the shell structure.
A major aspect of the study presented in this paper is the analysis conducted by Cullan Howlett to understand the significance of this discovery against a physical BAO model, using in particular mock galaxy catalogs with and without BAO features.
Last but not least, a new measurement of the Hubble Constant is obtained by analyzing the geometrical properties of Ho'oleilana: 76.9 (+8.2)(-4.8) km/s /Mpc
This value is consistent with other direct local probes, and further exacerbates the "Hubble tension" in the ΛCDM model.
Ka’iu and Larry Kimura named other astronomical objects before: the interstellar asteroid ʻOumuamua, the imaged black hole Pōwehi (M87*), and others as part of the "A Hua He Inoa" program: Leleākūhonua an extreme transneptunian, Pōniuāʻena a quasar, ...
Ho'oleilana - a fossil from a time near the birth of the universe
Check out this video for more context and insights on the process of formation of Baryon Acoustic oscillations - with credits to ARC Centre of Excellence for All-Sky Astrophysics (CAASTRO)
"Auf der Suche nach Schwächen im kosmologischen #Standardmodell"
"Neue Computersimulationen verfolgen die Entstehung von Galaxien und die Entwicklung der großräumigen Struktur des Kosmos mit bisher unerreichter statistischer Präzision. .. Pressemitteiliung des MPA."
#Cosmology#LCDM + #TiredLight
"Reinventing cosmology: New research puts age of universe at 26.7 -- not 13.7 -- billion years"
'Our universe could be twice as old as current estimates, according to a new study that challenges the dominant cosmological model and sheds new light on the so-called impossible early galaxy problem.'
#HubbleTension#Sigma8Tension#LCDM
"Here, as a last-ditch effort, we point out that disregarding the large angular scale polarization obtained by Planck, which allows for significantly larger values of the matter clustering parameter σ8, could lead to better agreement between Planck and JWST within the ΛCDM framework."
Last-ditch: a desperate final attempt = If this explanation doesn't work, they will give up #ΛCDM 👍