Create accountLogin

Recent searches

No recent searches

Search options

Only available when logged in.
shakedown.social is one of the many independent Mastodon servers you can use to participate in the fediverse.
A community for live music fans with roots in the jam scene. Shakedown Social is run by a team of volunteers (led by @clifff and @sethadam1) and funded by donations.

Administered by:

Server stats:

255
active users

shakedown.social: AboutStatusProfiles directoryPrivacy policy

Mastodon: AboutGet the appKeyboard shortcutsView source codev4.3.7

#ho

0 posts0 participants0 posts today
Replied in thread
Public
Daniel Pomarède

A special thanks to digital artist Frédéric Durillon for this beautiful view of Ho'oleilana.

Credits: Frédéric Durillon, Animea Studio; Daniel Pomarède, IRFU, CEA University Paris-Saclay; government funding provided by France 2030 (P2I Graduate School of Physics) ref ANR-11-IDEX-0003

#ho'oleilana #hooleilana #cosmology #bao #baryon #acoustic #oscillations #astronomy #astrophysics #astrodon #universe #space #discovery #physics #theory #bigbang #art #artist #digitalart #digitalartist

An artist's view of Ho'oleilana. The three-dimensional shell enclosed by the Baryon Acoustic Oscillation is colorized in reddish/orange/brown color and enhanced to capture its content in terms of galaxies and to expose how it is encapsulated in the larger structure of the Cosmic Web. Galaxies are shown as luminous tiny specks. The Cosmic Web is represented as the blueish filamentary maze. This view also exposes the other structures discovered by the Cosmicflows research program: Laniakea our Home supercluster of galaxies; the South Pole Wall, a giant filament of the cosmic web that embraces the sourthernmost frontiers of Laniakea; the Dipole Repeller and the Cold Spot Repeller, two underdense regions presumably associated to two giant cosmic voids. Credits: Frédéric Durillon, Animea Studio; Daniel Pomarède, IRFU, CEA University Paris-Saclay. This work benefited from a government funding by France 2030 (P2I - Graduate School of Physics) under reference ANR-11-IDEX-0003.
Replied in thread
Public
Daniel Pomarède

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)

vimeo.com/844199726

#ho'oleilana #hooleilana #cosmology #bao #baryon #acoustic #oscillations #astronomy #astrophysics #astrodon #universe #space #science #research #discovery #physics #theory #bigbang #lcdm

VimeoHo'oleilana - a fossil from a time near the birth of the universeBy Daniel Pomarède
Replied in thread
Public
Daniel Pomarède

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, ...

imiloahawaii.org/a-hua-he-inoa

#ho'oleilana #hooleilana #AHuaHeInoa #kumulipo #kaiukimura #larrykimura #hilo #cosmology #bao #baryon #acoustic #oscillations #astronomy #astrophysics #astrodon #universe #space #discovery #physics #theory #bigbang #lcdm

ʻImiloa Astronomy CenterA Hua He Inoa — ʻImiloa Astronomy CenterA Hua He Inoa - a collaborative effort lead by ʻImiloa - is shifting global paradigms, positioning Hawai‘i as the first place in the world to weave traditional indigenous practices into the process of officially naming astronomical discoveries.
Replied in thread
Public
Daniel Pomarède

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.

#ho'oleilana #hooleilana #cosmology #bao #baryon #acoustic #oscillations #astronomy #astrophysics #astrodon #universe #space #science #research #discovery #physics #theory #bigbang #lcdm #hubble #hubbleconstant

Studio Portrait of Edwin Powell Hubble. Photographer: Johan Hagemeyer, Camera Portraits Carmel.
Replied in thread
Public
Daniel Pomarède

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.

#ho'oleilana #hooleilana #cosmology #bao #baryon #acoustic #oscillations #astronomy #astrophysics #astrodon #universe #space #science #research #discovery #physics #theory #bigbang #lcdm

Continued thread
Public
Daniel Pomarède

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.

vimeo.com/814958164

#ho'oleilana #hooleilana #cosmology #bao #baryon #acoustic #oscillations #astronomy #astrophysics #astrodon #universe #space #science #research #discovery #physics #theory #bigbang #lcdm #video #visualization #vimeo

VimeoHo'oleilana - An individual Baryon Acoustic OscillationBy Daniel Pomarède
Continued thread
Public *
Daniel Pomarède

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.

skfb.ly/oKRIN

#ho'oleilana #hooleilana #cosmology #bao #baryon #acoustic #oscillations #astronomy #astrophysics #astrodon #universe #space #science #research #discovery #physics #theory #bigbang #lcdm #sketchfab #visualization

Continued thread
Public
Daniel Pomarède

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.

Interactive visualization:
irfu.cea.fr/Projets/COAST/Ho'o

#ho'oleilana #hooleilana #cosmology #bao #baryon #acoustic #oscillations #astronomy #astrophysics #astrodon #universe #space #science #research #discovery #physics #theory #bigbang #lcdm

Interactive 3D visualization of the Cosmicflows-4 galaxy groups, highlighting those associated with Ho'oleilana. Individual galaxy groups are seen as points in black, except those lying within the shell of Ho'oleilana.
Continued thread
Public
Daniel Pomarède

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 #hooleilana #cosmology #bao #baryon #acoustic #oscillations #astronomy #astrophysics #astrodon #universe #space #science #research #discovery #physics #theory #bigbang #lcdm

Continued thread
Public
Daniel Pomarède

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.

#ho'oleilana #hooleilana #cosmology #bao #baryon #acoustic #oscillations #astronomy #astrophysics #astrodon #universe #space #science #research #discovery #physics #theory #bigbang #lcdm

ames Peebles Photo by Princeton University, Robert P. Matthews (1990)
ExploreLive feeds
About