Local Hole revisited: evidence for bulk motions and self-consistent outflow

Shanks, T.; Hogarth, L. M.; Metcalfe, N.; Whitbourn, J. R.

doi:10.1093/mnras/stz2863

Cited by 21 publications

(11 citation statements)

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“…5 show that if we were to use data from around z ≈ 0.2, then the inferred value H 0 would be about 0.2 km s −1 Mpc −1 greater than the value of H 0 inferred from the data at z ≈ 0. A phenomenon that is qualitatively similar to this, but stronger and with a sign reversal, is the "Hubble bubble" [27], which remains present in recent data, e.g., [28,29]. While several other effects could result in a similar apparent change of the Hubble constant [25,26], it is interesting that torsion could lead to such changes.…”

Section: Torsion ϕsupporting

confidence: 59%

Cosmological signatures of torsion and how to distinguish torsion from the dark sector

Bolejko¹,

Cinus²,

Roukema³

2020

Phys. Rev. D

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Torsion is a non-Riemannian geometrical extension of general relativity that allows including the spin of matter and the twisting of spacetime. Cosmological models with torsion have been considered in the literature to solve problems of either the very early (high redshift z) or the present-day Universe. This paper focuses on distinguishable observational signatures of torsion that could not be otherwise explained with a scalar field in pseudo-Riemannian geometry. We show that when torsion is present, the cosmic duality relation between the angular diameter distance, D A , and the luminosity distance, D L , is broken. We show how the deviation described by the parameter η ¼ D L =½D A ð1 þ zÞ 2 − 1 is linked to torsion and how different forms of torsion lead to special-case parametrizations of η, including η 0 z, η 0 z=ð1 þ zÞ, and η 0 lnð1 þ zÞ. We also show that the effects of torsion could be visible in low-redshift data, inducing biases in supernovae-based H 0 measurements. We also show that torsion can impact the Clarkson-Bassett-Lu (CBL) functionwhere D is the transverse comoving distance. If D is inferred from the luminosity distance, then, in general, nonzero torsion models, CðzÞ ≠ 0. For pseudo-Riemannian geometry, the Friedmann-Lemaître-Robertson-Walker metric has CðzÞ ≡ 0; thus, the measurement of the Clarkson-Bassett-Lu function could provide another diagnostic of torsion.

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Section: Torsion ϕsupporting

confidence: 59%

Cosmological signatures of torsion and how to distinguish torsion from the dark sector

Bolejko¹,

Cinus²,

Roukema³

2020

Phys. Rev. D

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“…Several studies have already discussed a potential connection between the local void and the Hubble tension (e.g. Keenan et al 2013;Enea 2018;Shanks et al 2019;Kenworthy et al 2019). Indeed, if mass conservation is assumed, a large underdensity in the local number density of galaxies should also show up in the velocity field.…”

Section: Hubble Tensionmentioning

confidence: 99%

The KBC void and Hubble tension contradict $Λ$CDM on a Gpc scale $-$ Milgromian dynamics as a possible solution

Haslbauer,

Banik,

Kroupa

2020

Preprint

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The KBC void is a local underdensity with the observed relative density contrast δ ≡ 1 − ρ/ρ 0 = 0.46 ± 0.06 between 40 and 300 Mpc around the Local Group. If mass is conserved in the Universe, such a void could explain the 5.3σ Hubble tension. However, the MXXL simulation shows that the KBC void causes 6.04σ tension with standard cosmology (ΛCDM). Combined with the Hubble tension, ΛCDM is ruled out at 7.09σ confidence. Consequently, the density and velocity distribution on Gpc scales suggest a long-range modification to gravity. In this context, we consider a cosmological MOND model supplemented with 11 eV/c 2 sterile neutrinos. We explain why this νHDM model has a nearly standard expansion history, primordial abundances of light elements, and cosmic microwave background (CMB) anisotropies. In MOND, structure growth is self-regulated by external fields from surrounding structures. We constrain our model parameters with the KBC void density profile, the local Hubble and deceleration parameters derived jointly from supernovae at redshifts 0.023 − 0.15, time delays in strong lensing systems, and the Local Group velocity relative to the CMB. Our best-fitting model simultaneously explains these observables at the 1.14% confidence level (2.53σ tension) if the void is embedded in a time-independent external field of 0.055 a 0 . Thus, we show for the first time that the KBC void can naturally resolve the Hubble tension in Milgromian dynamics. Given the many successful a priori MOND predictions on galaxy scales that are difficult to reconcile with ΛCDM, Milgromian dynamics supplemented by 11 eV/c 2 sterile neutrinos may provide a more holistic explanation for astronomical observations across all scales.

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“…under-density on the scale suggested by WS14. However, Shanks et al (2019b) (see also Whitbourn & Shanks 2016) question the choice of the Luminosity Function (LF) parameters used by Jasche & Lavaux (2019) and LH11.…”

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confidence: 99%

The Local Hole: a galaxy under-density covering 90% of sky to ~200 Mpc

Wong,

Shanks,

Metcalfe

et al. 2021

Preprint

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We investigate the 'Local Hole', an anomalous under-density in the local galaxy environment, by extending our previous galaxy 𝐾−band number-redshift and number-magnitude counts to ≈ 90% of the sky. Our redshift samples are taken from the 2MASS Redshift Survey (2MRS) and the 2M++ catalogues, limited to 𝐾 < 11.5. We find that both surveys are in good agreement, showing an ≈ 21 − 22% under-density at 𝑧 < 0.075 when compared to our homogeneous counts model that assumes the same luminosity function and other parameters as Whitbourn & Shanks (2014). Using the Two Micron All Sky Survey (2MASS) for 𝑛(𝐾) galaxy counts, we measure an under-density relative to this model of 20 ± 2% at 𝐾 < 11.5, which is consistent in both form and scale with the observed 𝑛(𝑧) under-density. To examine further the accuracy of the counts model, we compare its prediction for the fainter 𝑛(𝐾) counts of the Galaxy and Mass Assembly (GAMA) survey. We further compare these data with a model assuming the parameters of Lavaux & Hudson (2011) whose previous study found little evidence for the Local Hole. At 13 < 𝐾 < 16 we find a significantly better fit for our model, arguing for our higher luminosity function normalisation. Although our implied under-density of ≈ 20% means local measurements of the Hubble Constant have been over-estimated by ≈ 3%, such a scale of under-density is in tension with a global ΛCDM cosmology at an ≈ 3𝜎 level.

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Local Hole revisited: evidence for bulk motions and self-consistent outflow

Cited by 21 publications

References 50 publications

Cosmological signatures of torsion and how to distinguish torsion from the dark sector

Cosmological signatures of torsion and how to distinguish torsion from the dark sector

The KBC void and Hubble tension contradict $Λ$CDM on a Gpc scale $-$ Milgromian dynamics as a possible solution

The Local Hole: a galaxy under-density covering 90% of sky to ~200 Mpc

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