Quantifying the global ‘CMB tension’ between the Atacama Cosmology Telescope and the <i>Planck</i> satellite in extended models of cosmology

Valentino, Eleonora Di; Giarè, William; Melchiorri, A.; Silk, Joseph

doi:10.1093/mnras/stad152

Cited by 24 publications

(19 citation statements)

References 88 publications

(50 reference statements)

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“…For the 7-dimensional IDE model considered in this work, we find that the tension between ACT and Planck persists at a Gaussian equivalent level of 2.3σ (log S = −4.7, p = 0.0217, χ 2 = 16.4 ), similar to the baseline cosmological model [90,91]. Therefore, we conclude that IDE cosmologies do not provide a resolution to the discrepancies observed between the two CMB probes.…”

Section: Resultsmentioning

confidence: 62%

“…Notice that these values are very close to those obtained with ACT only data (see Table I) and that the most relevant effect when adding the prior on the Hubble constant is a decrease on its error, being the change on its mean value completely negligible and therefore making the hints for an IDE cosmology from high multipole data a neat result. We measure the level of agreement between Planck and ACT under the Interacting Dark Energy cosmology, adopting the Suspiciousness statistics [89][90][91]. This methodology provides a comprehensive overview of how these discrepancies evolve in extended parameter-spaces, without being influenced by biases resulting from prior volume effects.…”

Section: Resultsmentioning

confidence: 99%

“…In particular, to avoid any unintended influence of the prior volume, we separate the Bayes Ratio into two parts: the Information (I), which is dependent on the prior, and the Suspiciousness (S), which is independent of the prior. If the datasets are uncorrelated and the posterior distributions follow a Gaussian-like distribution with means of µ and a covariance matrix of Σ, the Suspiciousness can be estimated as [89][90][91]…”

Section: Resultsmentioning

confidence: 99%

See 2 more Smart Citations

A Consistent View of Interacting Dark Energy from Multiple CMB Probes

Zhai¹,

Giarè²,

Bruck³

et al. 2023

Preprint

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We analyze a cosmological model featuring an interaction between dark energy and dark matter in light of the measurements of the Cosmic Microwave Background released by three independent experiments: the most recent data by the Planck satellite and the Atacama Cosmology Telescope, and WMAP (9-year data). We show that different combinations of the datasets provide similar results, always favoring an interacting dark sector with a 95% CL significance in the majority of the cases. Remarkably, such a preference remains consistent when cross-checked through independent probes, while always yielding a value of the expansion rate H0 consistent with the local distance ladder measurements. We investigate the source of this preference by scrutinizing the angular power spectra of temperature and polarization anisotropies as measured by different experiments.

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Section: Resultsmentioning

confidence: 62%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

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A Consistent View of Interacting Dark Energy from Multiple CMB Probes

Zhai¹,

Giarè²,

Bruck³

et al. 2023

Preprint

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“…The absence of detection of B-mode polarization in the cosmic microwave background [100], which would represent a smoking-gun evidence for inflation, offering valuable information on its underlying micro-physics, presents a major challenge. In addition, the emerging disagreements among independent CMB observations [101][102][103][104][105][106][107][108] often involve inflationary parameters [41,105,106], contributing to the ongoing uncertainty. Thus, with inflation, one of the important cornerstones of modern cosmology, we find ourselves between the known and unknown.…”

Section: Jcap09(2023)019mentioning

confidence: 99%

Inflationary potential as seen from different angles: model compatibility from multiple CMB missions

Giarè,

Pan,

Di Valentino

et al. 2023

J. Cosmol. Astropart. Phys.

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The cosmic microwave background (CMB) temperature and polarization anisotropies, as observed by independent astronomical missions such as WMAP, Planck, and most recently the Atacama Cosmology Telescope and the South Pole Telescope have played a vital role in accurately constraining cosmological theories and models, establishing cosmic inflation as the most widely accepted theory for describing the physics of the early Universe. However, the absence of a definitive detection of B-mode polarization and the emerging discrepancies among different CMB experiments present a challenge in determining which inflationary models best explain the observed data. In this work, we further explore this difficulty and conduct a case study by analyzing four well-known inflationary potentials in light of the latest CMB temperature and polarization anisotropy measurements and lensing data released by the Planck satellite and the Atacama Cosmology Telescope. Additionally, we incorporate B-modes polarization data from the BICEP/Keck Collaboration, as well as Baryon Acoustic Oscillations and Redshift Space Distortions measurements from BOSS DR12 and eBOSS DR16. We show that the most typical models such as Starobinsky and α-attractors are in disagreement with the Atacama Cosmology Telescope small-scale CMB measurements, particularly when combined with B-modes polarization data. On the other hand, these potentials are in perfect agreement with the Planck measurements at larger angular scales. This dichotomy makes it challenging to identify a single model or a group of models that can be universally considered as the preferred choice based on all available CMB observations.

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“…However, despite its remarkable success, inflation is not free from limitations. From an observational perspective, the absence of a definitive detection of B-mode polarization [8,9] and the emerging discrepancies among different Cosmic Microwave Background (CMB) experiments [10][11][12][13][14][15][16][17][18] pose new challenges in determining precise predictions for the inflationary models/mechanisms that best explain observational data [19], and various studies suggest that modifications to the inflationary sector of the cosmological model might play a relevant role in addressing (part of) the tension between the value of the expansion rate of the Universe H 0 [20][21][22][23][24] measured through direct local distance ladder measurements and the value inferred from CMB observations, see e.g., [25][26][27][28][29][30][31][32][33][34]. On the other hand, from a theoretical standpoint, despite a plethora of proposed models and mechanisms [35], the nature of the inflation field (or fields) remains still unknown and embedding inflation in a more fundamental theory remains an open problem [36][37][38].…”

Section: Introductionmentioning

confidence: 99%

Tracking the multifield dynamics with cosmological data: a Monte Carlo approach

Giarè,

De Angelis,

van de Bruck

et al. 2023

J. Cosmol. Astropart. Phys.

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We introduce a numerical method specifically designed for investigating generic multifield models of inflation where a number of scalar fields ϕ K are minimally coupled to gravity and live in a field space with a non-trivial metric 𝒢> IJ (ϕ K ). Our algorithm consists of three main parts. Firstly, we solve the field equations through the entire inflationary period, deriving predictions for observable quantities such as the spectrum of scalar perturbations, primordial gravitational waves, and isocurvature modes. We also incorporate the transfer matrix formalism to track the behavior of adiabatic and isocurvature modes on super-horizon scales and the transfer of entropy to scalar modes after the horizon crossing. Secondly, we interface our algorithm with Boltzmann integrator codes to compute the subsequent full cosmology, including the cosmic microwave background anisotropies and polarization angular power spectra. Finally, we develop a novel sampling algorithm able to efficiently explore a large volume of the parameter space and identify a sub-region where theoretical predictions agree with observations. In this way, sampling over the initial conditions of the fields and the free parameters of the models, we enable Monte Carlo analysis of multifield scenarios. We test all the features of our approach by analyzing a specific model and deriving constraints on its free parameters. Our methodology provides a robust framework for studying multifield inflation, opening new avenues for future research in the field.

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Quantifying the global ‘CMB tension’ between the Atacama Cosmology Telescope and the Planck satellite in extended models of cosmology

Cited by 24 publications

References 88 publications

A Consistent View of Interacting Dark Energy from Multiple CMB Probes

A Consistent View of Interacting Dark Energy from Multiple CMB Probes

Inflationary potential as seen from different angles: model compatibility from multiple CMB missions

Tracking the multifield dynamics with cosmological data: a Monte Carlo approach

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