A Supervoid Explanation of the Cosmic Microwave Background Cold Spot

Finelli⋆, F.; García-Bellido, J.; Kovács, András; Paci, F.; Szapudi, István

doi:10.1017/s1743921314013714

Cited by 20 publications

(78 citation statements)

References 5 publications

(3 reference statements)

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“…More recently, Refs. [78,79] claimed the detection of a supervoid aligned with a prominent cold spot in the Planck CMB maps, as one would expect in models with positive ISW effect.…”

Section: Parameter/datasetmentioning

confidence: 92%

The observational status of Galileon gravity after Planck

Barreira

Baugh

et al. 2014

J. Cosmol. Astropart. Phys.

131

196

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We use the latest CMB data from Planck, together with BAO measurements, to constrain the full parameter space of Galileon gravity. We constrain separately the three main branches of the theory known as the Cubic, Quartic and Quintic models, and find that all yield a very good fit to these data. Unlike in ΛCDM, the Galileon model constraints are compatible with local determinations of the Hubble parameter and predict nonzero neutrino masses at over 5σ significance. We also identify that the low-l part of the CMB lensing spectrum may be able to distinguish between ΛCDM and Galileon models. In the Cubic model, the lensing potential deepens at late times on sub-horizon scales, which is at odds with the current observational suggestion of a positive ISW effect. Compared to ΛCDM, the Quartic and Quintic models predict less ISW power in the low-l region of the CMB temperature spectrum, and as such are slightly preferred by the Planck data. We illustrate that residual local modifications to gravity in the Quartic and Quintic models may render the Cubic model as the only branch of Galileon gravity that passes Solar System tests.

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“…More recently, Refs. [78,79] claimed the detection of a supervoid aligned with a prominent cold spot in the Planck CMB maps, as one would expect in models with positive ISW effect.…”

Section: Parameter/datasetmentioning

confidence: 92%

The observational status of Galileon gravity after Planck

Barreira

Baugh

et al. 2014

J. Cosmol. Astropart. Phys.

131

196

View full text Add to dashboard Cite

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“…A first attempt to understand a possible correlation between these observations was made in Ref. [516], where it was found that a Lemaître-Tolman-Bondi (LTB) void could fit both the Cold Spot and the super-void.…”

Section: Anomaly Detection: a How-to Guidementioning

confidence: 99%

BeyondΛCDM: Problems, solutions, and the road ahead

Bull

Akrami

Adamek

et al. 2016

Physics of the Dark Universe

441

210

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Despite its continued observational successes, there is a persistent (and growing) interest in extending cosmology beyond the standard model, ΛCDM. This is motivated by a range of apparently serious theoretical issues, involving such questions as the cosmological constant problem, the particle nature of dark matter, the validity of general relativity on large scales, the existence of anomalies in the CMB and on small scales, and the predictivity and testability of the inflationary paradigm. In this paper, we summarize the current status of ΛCDM as a physical theory, and review investigations into possible alternatives along a number of different lines, with a particular focus on highlighting the most promising directions. While the fundamental problems are proving reluctant to yield, the study of alternative cosmologies has led to considerable progress, with much more to come if hopes about forthcoming high-precision observations and new theoretical ideas are fulfilled.Keywords: cosmology -dark energy -cosmological constant problem -modified gravitydark matter -early universe Cosmology has been both blessed and cursed by the establishment of a standard model: ΛCDM. On the one hand, the model has turned out to be extremely predictive, explanatory, and observationally robust, providing us with a substantial understanding of the formation of large-scale structure, the state of the early Universe, and the cosmic abundance of different types of matter and energy. It has also survived an impressive battery of precision observational tests -anomalies are few and far between, and their significance is contentious where they do arise -and its predictions are continually being vindicated through the discovery of new effects (B-mode polarization [1] and lensing [2,3] of the cosmic microwave background (CMB), and the kinetic Sunyaev-Zel'dovich effect [4] being some recent examples). These are the hallmarks of a good and valuable physical theory.On the other hand, the model suffers from profound theoretical difficulties. The two largest contributions to the energy content at late times -cold dark matter (CDM) and the cosmological constant (Λ) -have entirely mysterious physical origins. CDM has so far evaded direct detection by laboratory experiments, and so the particle field responsible for it -presumably a manifestation of "beyond the standard model" particle physics -is unknown. Curious discrepancies also appear to exist between the predicted clustering properties of CDM on small scales and observations. The cosmological constant is even more puzzling, giving rise to quite simply the biggest problem in all of fundamental physics: the question of why Λ appears to take such an unnatural value [5,6,7]. Inflation, the theory of the very early Universe, has also been criticized for being fine-tuned and under-predictive [8], and appears to leave many problems either unsolved or fundamentally unresolvable. These problems are indicative of a crisis.From January 14th-17th 2015, we held a conference in Oslo, Norway to surve...

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“…The void is aligned with the Cold Spot (CS) in the CMB (Finelli et al 2016), hence we call it the "CS Void." The survey area is 21200 sq.…”

Section: Voidmentioning

confidence: 99%