Ho’oleilana: An Individual Baryon Acoustic Oscillation?

Tully, R. Brent; Howlett, Cullan; Pomarède, Daniel

doi:10.3847/1538-4357/aceaf3

Cited by 11 publications

(4 citation statements)

References 39 publications

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“…We have found an interesting ring shape in the Mg II absorbers, indicating a LSS of galaxies and galaxy clusters, that spans a diameter of ∼ 400 Mpc scaled to the present epoch. Incidentally, the estimated size of the BR is close to that which could be expected in a detection of an individual Baryon Acoustic Oscillation (BAO), r ∼ 150 Mpc [26][27][28][29][30], but we later suggest that the BR is unlikely to have its origins in BAOs. The BR shape and size are both hard to understand in our current theoretical framework.…”

Section: Introductionsupporting

confidence: 78%

A Big Ring on the sky

Lopez,

Clowes,

Williger

2024

J. Cosmol. Astropart. Phys.

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We present the discovery of `A Big Ring on the Sky' (BR), the second ultra-large large-scale structure (uLSS) found in Mg II-absorber catalogues, following the previously reported Giant Arc (GA). In cosmological terms the BR is close to the GA — at the same redshift z ∼ 0.8 and with a separation on the sky of only ∼ 12°. Two extraordinary uLSSs in such close configuration raises the possibility that together they form an even more extraordinary cosmological system. The BR is a striking circular, annulus-like, structure of diameter ∼ 400 Mpc (proper size, present epoch). The method of discovery is as described in the GA paper, but here using the new Mg II-absorber catalogues restricted to DR16Q quasars. Using the Convex Hull of Member Spheres (CHMS) algorithm, we estimate that the annulus and inner absorbers of the BR have departures from random expectations, at the density of the control field, of up to 5.2σ. We present the discovery of the BR, assess its significance using the CHMS, Minimal Spanning Tree (MST), FilFinder and Cuzick & Edwards (CE) methods, discuss it in the context of the GA+BR system, and suggest some implications for the origins of uLSS and for our understanding of cosmology. For example, it may be that unusual geometric patterns, such as these uLSSs, have an origin in cosmic strings.

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Section: Introductionsupporting

confidence: 78%

A Big Ring on the sky

Lopez,

Clowes,

Williger

2024

J. Cosmol. Astropart. Phys.

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“…In the article "Ho'oleilana: An Individual Baryon Acoustic Oscillation?" [1], R. B. Tully, C. Howlett, and D. Pomarède claim: Evidence is presented here for the discovery of a remarkably strong individual contribution to the baryon acoustic oscillation (BAO) signal at z = 0.068, an entity that is given the name Ho'oleilana. The radius of the 3D structure is 1 75 155h − Mpc.…”

Section: Introductionmentioning

confidence: 91%

Cosmic Bubbles

Netchitailo

2024

JHEPGC

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The present paper is inspired by the article "Ho'oleilana: An Individual Baryon Acoustic Oscillation?" published by R. B. Tully, C. Howlett, and D. Pomarède on Sep. 2023 [1]. They claim: Evidence is presented here for the discovery of a remarkably strong individual contribution to the baryon acoustic oscillation (BAO) signal at z = 0.068, an entity that is given the name Ho'oleilana. K. Dawson, co-spokesperson for Dark Energy Spectroscopic Instrument is more inclined to believe that this latest finding is something of a coincidence, a chance alignment that simply looks like a sphere with a radius around what you'd expect for a BAO [2]. In this paper, we provide a short summary of experimental observations of Boötes Void and Superclusters; discuss the main features of the developed Hypersphere World-Universe Model; introduce notions "Cosmic Voids" and "Cosmic Bubbles"; elaborate a mathematical framework for different types of Cosmic Bubbles (Hubble Spherical Bubble for the World, Disk Bubbles for Galaxies; Spherical Bubbles for Extrasolar Systems, Dark Matter (DM) Spherical Bubbles for Galaxies and Superclusters); make a conclusion that the Boötes is a DM Cosmic Bubble and suggest experiments, which confirm our conclusion.

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“…While local measurements of H 0 tend to lean towards the higher end of the tension (∼ 73), high-redshift, BAO and early universe probes (CMB) tend towards the lower side of the tension (∼ 67). Contrary to this trend, Tully et al (2023) derived a value of the Hubble constant of 76.9 +8.2 −4.8 from an observation of a complete BAO structure, introducing complexity to the tension.…”

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confidence: 90%

Dark energy constraints from Pantheon+ Ia supernovae data

Torres-Arzayus

2024

Astrophys Space Sci

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Measurements of the current expansion rate of the Universe, H0, using standard candles, disagree with those derived from observations of the Cosmic Microwave Background (CMB). This discrepancy, known as the Hubble tension, is substantial and suggests the possibility of revisions to the standard cosmological model (Cosmological constant Λ and cold dark matter -ΛCDM ). Dynamic dark energy (DE) models that introduce deviations in the expansion history relative to ΛCDM could potentially explain this tension. We used Type Ia supernovae (SNe) data to test a dynamic DE model consisting of an equation of state that varies linearly with the cosmological scale factor a. To evaluate this model, we developed a new statistic (the Tα statistic) used in conjunction with an optimization code that minimizes its value to obtain model parameters. The Tα statistic reduces bias errors (in comparison to the χ 2 statistic) because it retains the sign of the residuals, which is meaningful in testing the dynamic DE model as the deviations in the expansion history introduced by this model act asymmetrically in redshift space. The DE model fits the SNe data reasonably well, but the available SNe data lacks the statistical power to discriminate between ΛCDM and alternative models. To further assess the model using CMB data, we computed the distance to the last scattering surface and compared the results with that derived from the Planck observations. Although the simple dynamic DE model tested does not completely resolve the tension, it is not ruled out by the data and could still play a role alongside other physical effects.

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Ho’oleilana: An Individual Baryon Acoustic Oscillation?

Cited by 11 publications

References 39 publications

A Big Ring on the sky

A Big Ring on the sky

Cosmic Bubbles

Dark energy constraints from Pantheon+ Ia supernovae data

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