The DES view of the Eridanus supervoid and the CMB cold spot

Kovács, András; Jeffrey, Niall; Gatti, M.; Chang, C.; Whiteway, L.; Hamaus, Nico; Lahav, O.; Pollina, Giorgia; Bacon, David; Kacprzak, T.; Mawdsley, B; Nadathur, Seshadri; Zürcher, Dominik; García-Bellido, J.; Alarcón, A.; Amon, A.; Bechtol, K.; Bernstein, G. M.; Campos, A.; Rosell, A. Carnero; Kind, M. Carrasco; Cawthon, R.; Chen, R; Choi, A.; Cordero, J.; Davis, C.; DeRose, Joseph J.; Doux, C.; Drlica-Wagner, A.; Eckert, K.; Elsner, F.; Elvin-Poole, J.; Everett, S.; Ferté, A.; Giannini, G.; Gruen, D.; Gruendl, R. A.; Harrison, I.; Hartley, W. G.; Herner, K.; Huff, Eric; Huterer, Dragan; Kuropatkin, N.; Jarvis, M.; Léget, P.-F.; MacCrann, N.; McCullough, J.; Muir, J.; Myles, J.; Navarro-Alsina, A.; Pandey, Shivam; Prat, J.; Raveri, Marco; Rollins, R. P.; Ross, Ashley J.; Rykoff, E. S.; Sánchez, C.; Secco, L. F.; Sevilla-Noarbe, I.; Sheldon, E.; Shin, T.; Troxel, M. A.; Tutusaus, I.; Varga, T. N.; Yanny, B.; Yin, B.; Zhang, Y; Zuntz, Joe; Aguena, M.; Allam, S.; Andrade-Oliveira, F.; Annis, J.; Bertin, E.; Brooks, D.; Burke, D. L.; Carretero, J.; Costanzi, M.; Costa, L. N. da; Pereira, M. E. S.; Davis, Tamara M.; Vicente, J. De; Desai, S.; Diehl, H. T.; Ferrero, I.; Flaugher, B.; Fosalba, P.; Frieman, Joshua A.; Gaztañaga, E.; Gerdes, D. W.; Giannantonio, T.; Gschwend, J.; Gutiérrez, G.; Hinton, S. R.; Hollowood, D. L.; Honscheid, K.; James, D. J.; Kuêhn, K.; Lima, M.; Maia, M. A. G.; Marshall, J. L.; Melchior, P.; Menanteau, F.; Miquel, R.; Morgan, R.; Ogando, R. L. C.; Paz-Chinchón, F.; Pieres, A.; Plazas, A. A.; Monroy, M Rodriguez; Romer, Kathy; Roodman, A.; Sánchez, E.; Schubnell, M.; Serrano, S.; Smith, M.; Soares-Santos, M.; Suchyta, E.; Swanson, M. E. C.; Tarlè, G.; Thomas, Daniel; To, C.; Weller, J.

doi:10.1093/mnras/stab3309

Cited by 22 publications

(17 citation statements)

References 115 publications

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“…Testing the extremes, a recent mapping of the Eridanus supervoid aligned with the CMB Cold Spot using DES weak lensing mass maps (Jeffrey et al 2021) also provides more evidence for the alignment of a large under-dense region and a colder-than-expected spot on the CMB sky (Kovács et al 2022).…”

mentioning

confidence: 99%

Dark Energy Survey Year 3 results: Imprints of cosmic voids and superclusters in the Planck CMB lensing map

Kovács

Vielzeuf

Ferrero

et al. 2022

Monthly Notices of the Royal Astronomical Society

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The CMB lensing signal from cosmic voids and superclusters probes the growth of structure in the low-redshift cosmic web. In this analysis, we cross-correlated the Planck CMB lensing map with voids detected in the Dark Energy Survey Year 3 (Y3) data set (∼5,000 deg2), expanding on previous measurements that used Y1 catalogues (∼1,300 deg2). Given the increased statistical power compared to Y1 data, we report a 6.6σ detection of negative CMB convergence (κ) imprints using approximately 3,600 voids detected from a redMaGiC luminous red galaxy sample. However, the measured signal is lower than expected from the MICE N-body simulation that is based on the ΛCDM model (parameters Ωm = 0.25, σ8 = 0.8), and the discrepancy is associated mostly with the void centre region. Considering the full void lensing profile, we fit an amplitude Aκ = κDES4pt/κMICE4pt to a simulation-based template with fixed shape and found a moderate 2σ deviation in the signal with Aκ ≈ 0.79 ± 0.12. We also examined the WebSky simulation that is based on a Planck 2018 ΛCDM cosmology, but the results were even less consistent given the slightly higher matter density fluctuations than in MICE. We then identified superclusters in the DES and the MICE catalogues, and detected their imprints at the 8.4σ level; again with a lower-than-expected Aκ = 0.84 ± 0.10 amplitude. The combination of voids and superclusters yields a 10.3σ detection with an Aκ = 0.82 ± 0.08 constraint on the CMB lensing amplitude, thus the overall signal is 2.3σ weaker than expected from MICE.

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confidence: 99%

Dark Energy Survey Year 3 results: Imprints of cosmic voids and superclusters in the Planck CMB lensing map

Kovács

Vielzeuf

Ferrero

et al. 2022

Monthly Notices of the Royal Astronomical Society

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“…We explore the ISW and κ profiles for three types of voids, assuming the elliptical void profile of [19]: (1) specz voids refers to typical voids found from spectroscopic surveys [20,21]; (2) photo-z voids from photometric surveys, i.e. large and preferentially elongated along the LOS; and (3) the combined profiles of the Eridanus voids [22] which are located in the direction of the CMB Cold Spot anomaly [23] and for which the role of the ISW from voids has generated considerable discussion [11,19,[24][25][26][27][28][29][30][31][32]. The void parameters used in this study are summarised in Table I.…”

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confidence: 99%

A dark matter solution to the $H_{0}$ and $σ_{8}$ tensions, and the integrated Sachs-Wolfe void anomaly

Naidoo¹,

Jaber²,

Hellwing³

et al. 2022

Preprint

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We consider a phenomenological model of dark matter with an equation-of-state that is negative and changing at late times. We show this couples the H0 and σ8 tensions, providing an explanation for both simultaneously, while also providing an explanation for the anomalously large integrated Sachs-Wolfe (ISW) effect from cosmic voids. Observations of high ISW from cosmic voids may therefore be evidence that dark matter plays a significant role in the H0 and σ8 tensions. We predict the ISW from cosmic voids to be a factor of ∼ 2 greater in this model than what is expected from the standard model ΛCDM.

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“…Their suggested void profile has a central underdensity of 0.25 and a characteristic size of 280 Mpc (see their equation 1). The Eridanus supervoid has actually been detected with roughly these parameters in DES weak lensing data of the region [771]. The void size and depth are quite similar to the KBC void [93].…”

Section: Other Anomalies In Large-scale Structurementioning

confidence: 65%

“…The Cold Spot is suggestive of enhanced structure formation on large scales, which could be related to the Hubble tension [772]. Note that even if the Eridanus supervoid did form in a ΛCDM universe, the resulting ISW signal would be insufficient to explain the CMB Cold Spot by a factor of ≈ 5, so the problem is not merely a matter of postulating a rare underdensity [771]. One could postulate that the CMB Cold Spot is mostly a primordial temperature fluctuation, but then a fairly rare supervoid would have to coincidentally align with it.…”

Section: Other Anomalies In Large-scale Structurementioning

confidence: 99%

From Galactic Bars to the Hubble Tension: Weighing Up the Astrophysical Evidence for Milgromian Gravity

Banik

Zhao

2022

Symmetry

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Astronomical observations reveal a major deficiency in our understanding of physics—the detectable mass is insufficient to explain the observed motions in a huge variety of systems given our current understanding of gravity, Einstein’s General theory of Relativity (GR). This missing gravity problem may indicate a breakdown of GR at low accelerations, as postulated by Milgromian dynamics (MOND). We review the MOND theory and its consequences, including in a cosmological context where we advocate a hybrid approach involving light sterile neutrinos to address MOND’s cluster-scale issues. We then test the novel predictions of MOND using evidence from galaxies, galaxy groups, galaxy clusters, and the large-scale structure of the universe. We also consider whether the standard cosmological paradigm (LCDM) can explain the observations and review several previously published highly significant falsifications of it. Our overall assessment considers both the extent to which the data agree with each theory and how much flexibility each has when accommodating the data, with the gold standard being a clear a priori prediction not informed by the data in question. Our conclusion is that MOND is favoured by a wealth of data across a huge range of astrophysical scales, ranging from the kpc scales of galactic bars to the Gpc scale of the local supervoid and the Hubble tension, which is alleviated in MOND through enhanced cosmic variance. We also consider several future tests, mostly at scales much smaller than galaxies.

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The DES view of the Eridanus supervoid and the CMB cold spot

Cited by 22 publications

References 115 publications

Dark Energy Survey Year 3 results: Imprints of cosmic voids and superclusters in the Planck CMB lensing map

Dark Energy Survey Year 3 results: Imprints of cosmic voids and superclusters in the Planck CMB lensing map

A dark matter solution to the $H_{0}$ and $σ_{8}$ tensions, and the integrated Sachs-Wolfe void anomaly

From Galactic Bars to the Hubble Tension: Weighing Up the Astrophysical Evidence for Milgromian Gravity

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