The cosmic microwave background Cold Spot anomaly: the impact of sky masking and the expected contribution from the integrated Sachs–Wolfe effect

Naidoo, Krishna; Benoit-Lévy, A.; Lahav, O.

doi:10.1093/mnrasl/slx140

Cited by 13 publications

(11 citation statements)

References 35 publications

(55 reference statements)

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“…Firstly, our results provide a framework to re-think the qualitatively similar case of the CMB Cold Spot (see e.g. Cruz et al 2005;Finelli et al 2015;Szapudi et al 2015;Kovács & García-Bellido 2016;Naidoo et al 2016Naidoo et al , 2017. With a significant enhancement of the density-temperature correlation at large scales, the Cold Spot and the Eridanus supervoid can plausibly be related via this unexpected excess signal.…”

Section: Discussionsupporting

confidence: 58%

More out of less: an excess integrated Sachs-Wolfe signal from supervoids mapped out by the Dark Energy Survey

Kovács,

Sánchez,

García-Bellido

et al. 2018

Preprint

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The largest structures in the cosmic web probe the dynamical nature of dark energy through their integrated Sachs-Wolfe imprints. In the strength of the signal, typical cosmic voids have shown good consistency with expectation A ISW = ∆T data /∆T theory = 1, given the substantial cosmic variance. Discordantly, large-scale hills in the gravitational potential, or supervoids, have shown excess signals. In this study, we mapped out 87 new supervoids in the total 5000 deg 2 footprint of the Dark Energy Survey at 0.2 < z < 0.9 to probe these anomalous claims. We found an excess imprinted profile with A ISW ≈ 4.1 ± 2.0 amplitude. The combination with independent BOSS data reveals an ISW imprint of supervoids at the 3.3σ significance level with an enhanced A ISW ≈ 5.2 ± 1.6 amplitude. The tension with ΛCDM predictions is equivalent to 2.6σ and remains unexplained.

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Section: Discussionsupporting

confidence: 58%

More out of less: an excess integrated Sachs-Wolfe signal from supervoids mapped out by the Dark Energy Survey

Kovács,

Sánchez,

García-Bellido

et al. 2018

Preprint

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“…With sizes spanning a large range of values, void statistics respond to different physical mechanisms on different scales. They have been shown to bear the signature of the Alcock-Paczyński effect [18,[31][32][33][34][35][36], redshift space distortions (RSD) [37][38][39][40][41][42][43][44][45][46], BAO [47], CMB lensing and weak gravitational lensing [48][49][50][51][52][53][54][55], and the integrated Sachs-Wolfe effect [49,[56][57][58][59][60][61][62]. Void statistics also provide access to higherorder clustering information, providing in this way measurements that are complementary to 2-point statistics from galaxy surveys and CMB anisotropies.…”

Section: Introductionmentioning

confidence: 99%

The void size function in dynamical dark energy cosmologies

Verza

Pisani

Carbone

et al. 2019

J. Cosmol. Astropart. Phys.

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We test a theoretical description of the void size distribution function against direct estimates from halo catalogues of the DEMNUni suite of large cosmological simulations. Besides standard ΛCDM, we consider deviations of the dark energy equation of state from w = −1, corresponding to four combinations in the popular Chevallier-Polarski-Linder parametrisation: w 0 = −0.9; −1.1, w a = −0.3; 0.3. The theoretical void size function provides an accurate description of the simulation measurements for the different dark energy models considered, within the statistical errors. The model remains accurate for any value of the threshold for void formation δ v . Its robust consistency with simulations demonstrates that the theoretical void size function can be applied to real data as a sensitive tool to constrain dark energy.

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“…Assuming a baseline CDM model, there is a consensus about the corresponding ISW imprint of supervoids with parameters consistent with the abo v e observ ationally determined v alues (see e.g. Nadathur et al 2014 ;Finelli et al 2015 ;Marcos-Caballero et al 2016 ;Naidoo et al 2016 ;Naidoo, Benoit-L évy & Lahav 2017 ). As shown in Fig.…”

Section: Cold Spot Hypothesismentioning

confidence: 67%

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

Kovács

Jeffrey

Gatti

et al. 2021

Monthly Notices of the Royal Astronomical Society

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The Cold Spot is a puzzling large-scale feature in the Cosmic Microwave Background temperature maps and its origin has been subject to active debate. As an important foreground structure at low redshift, the Eridanus supervoid was recently detected, but it was subsequently determined that, assuming the standard ΛCDM model, only about 10–20 per cent of the observed temperature depression can be accounted for via its Integrated Sachs–Wolfe imprint. However, R ≳ 100 h−1Mpc supervoids elsewhere in the sky have shown ISW imprints AISW ≈ 5.2 ± 1.6 times stronger than expected from ΛCDM (AISW = 1), which warrants further inspection. Using the Year-3 redMaGiC catalogue of luminous red galaxies from the Dark Energy Survey, here we confirm the detection of the Eridanus supervoid as a significant underdensity in the Cold Spot’s direction at z < 0.2. We also show, with S/N ≳ 5 significance, that the Eridanus supervoid appears as the most prominent large-scale underdensity in the dark matter mass maps that we reconstructed from DES Year-3 gravitational lensing data. While we report no significant anomalies, an interesting aspect is that the amplitude of the lensing signal from the Eridanus supervoid at the Cold Spot centre is about 30 per cent lower than expected from similar peaks found in N-body simulations based on the standard ΛCDM model with parameters Ωm = 0.279 and σ8 = 0.82. Overall, our results confirm the causal relation between these individually rare structures in the cosmic web and in the CMB, motivating more detailed future surveys in the Cold Spot region.

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The cosmic microwave background Cold Spot anomaly: the impact of sky masking and the expected contribution from the integrated Sachs–Wolfe effect

Cited by 13 publications

References 35 publications

More out of less: an excess integrated Sachs-Wolfe signal from supervoids mapped out by the Dark Energy Survey

More out of less: an excess integrated Sachs-Wolfe signal from supervoids mapped out by the Dark Energy Survey

The void size function in dynamical dark energy cosmologies

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

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