On the tension between Large Scale Structures and Cosmic Microwave Background

Douspis, M.; Salvati, L.; Aghanim, N.

doi:10.48550/arxiv.1901.05289

Cited by 22 publications

(23 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The single value σ 8 is mostly sensitive to the linear matter power spectrum over just a narrow band of k: 0.05 k (in h Mpc −1 ) 0.3. Third, given the much smaller error bars in the Planck SZ measurement of S 8 , the tension between the value inferred from the CMB measurements and that obtained from the low redshift measurements has increased substantially, to roughly 2 − 4σ [114,115]. 18 Given the key role the Planck SZ data plays in generating the S 8 tension, we also perform a set of fits including the Planck SZ value of S 8 , in addition to the spectral measurements of KV450.…”

Section: Constraints From Cmb Measurementsmentioning

confidence: 99%

Mirror Twin Higgs Cosmology: Constraints and a Possible Resolution to the $H_0$ and $S_8$ Tensions

Bansal,

Kim,

Kolda

et al. 2021

Preprint

View full text Add to dashboard Cite

The mirror twin Higgs model (MTH) is a solution to the Higgs hierarchy problem that provides well-predicted cosmological signatures with only three extra parameters: the temperature of the twin sector, the abundance of twin baryons, and the vacuum expectation value (VEV) of twin electroweak symmetry breaking. These parameters specify the behavior of twin radiation and the acoustic oscillations of twin baryons, which lead to testable effects on the cosmic microwave background (CMB) and large-scale structure (LSS). While collider searches can only probe the twin VEV, through a fit to cosmological data we show that the existing CMB (Planck18 TTTEEE+lowE+lowT+lensing) and LSS (KV450) data already provide useful constraints on the remaining MTH parameters. Additionally, we show that the presence of twin radiation in this model can raise the Hubble constant H 0 while the scattering twin baryons can reduce the matter fluctuations S 8 , which helps to relax the observed H 0 and S 8 tensions simultaneously. This scenario is different from the typical ΛCDM + ∆N eff model, in which extra radiation helps with the Hubble tension but worsens the S 8 tension. For instance, when including the SH0ES and Planck SZ data in the fit, we find that a universe with 20% of the dark matter comprised of twin baryons is preferred over ΛCDM by ∼ 4σ. If the twin sector is indeed responsible for resolving the H 0 and S 8 tensions, future measurements from the Euclid satellite and CMB Stage 4 experiment will further measure the twin parameters to O(1 − 10%)-level precision. Our study demonstrates how models with hidden naturalness can potentially be probed using precision cosmological data.

show abstract

Section: Constraints From Cmb Measurementsmentioning

confidence: 99%

Mirror Twin Higgs Cosmology: Constraints and a Possible Resolution to the $H_0$ and $S_8$ Tensions

Bansal,

Kim,

Kolda

et al. 2021

Preprint

View full text Add to dashboard Cite

show abstract

“…The obtained values of Λ are also influenced by the inhomogeneity of the data sources, e.g. by the inevitable difference between the lensing and dynamical masses of galaxy systems or the masses of CMB-SZ clusters (see [18]). The structure and the extension of the dark halos of galaxies [19] are especially relevant for pair galaxies and galaxy groups studies.…”

Section: Discussionmentioning

confidence: 99%

The cosmological constant derived via galaxy groups and clusters

Gurzadyan

Степанян

2019

Eur. Phys. J. C

View full text Add to dashboard Cite

The common nature of dark matter and dark energy is argued in [1] based on the approach that the cosmological constant Λ enters the weak-field General Relativity following from Newton theorem on the "sphere-point mass" equivalency [2]. Here we probe the Λ-gravity description of dark matter in galaxy systems, from pairs up to galaxy clusters using the data of various sources, i.e. of Local Supercluster galaxy surveys, gravity lensing and Planck satellite. The prediction that the cosmological constant has to be the lower limit for the weak-field Λ obtained from galaxy systems of various degree of virialization is shown to be supported by those observations. The results therefore support the Λ-gravity nature of dark matter in the studied systems, implying that the positivity of the cosmological constant might be deduced decades ago from the dynamics of galaxies and galaxy clusters far before the cosmological SN surveys.PACS. 98.80.-k Cosmology

show abstract

“…of fluctuations in the matter density on a scale of 8ℎ −1 Mpc) may display a similar tension at the 2-3𝜎 level (or ∼ 0.1 in this parameter, e.g. Battye et al 2015;Douspis et al 2019;To et al 2021;Heymans et al 2021). More generally, the fundamental natures of dark energy and dark matter remain unknown, raising the possibility of new, exotic physics not yet included in the standard cosmological model.…”

Section: Introductionmentioning

confidence: 99%

Cluster Assembly Times as a Cosmological Test

Amoura,

Drakos,

Berrouet

et al. 2021

Preprint

View full text Add to dashboard Cite

The abundance of galaxy clusters in the low-redshift universe provides an important cosmological test, constraining a product of the initial amplitude of fluctuations and the amount by which they have grown since early times. The degeneracy of the test with respect to these two factors remains a limitation of abundance studies. Clusters will have different mean assembly times, however, depending on the relative importance of initial fluctuation amplitude and subsequent growth. Thus, structural probes of cluster age such as concentration, shape or substructure may provide a new cosmological test that breaks the main degeneracy in number counts. We review analytic predictions for how mean assembly time should depend on cosmological parameters, and test these predictions using cosmological simulations. Given the overall sensitivity expected, we estimate the cosmological parameter constraints that could be derived from the cluster catalogues of forthcoming surveys such as Euclid, the Nancy Grace Roman Space Telescope, eROSITA, or CMB-S4. We show that by considering the structural properties of their cluster samples, such surveys could easily achieve errors of Δ𝜎 8 = 0.01 or better.

show abstract

On the tension between Large Scale Structures and Cosmic Microwave Background

Cited by 22 publications

References 0 publications

Mirror Twin Higgs Cosmology: Constraints and a Possible Resolution to the $H_0$ and $S_8$ Tensions

Mirror Twin Higgs Cosmology: Constraints and a Possible Resolution to the $H_0$ and $S_8$ Tensions

The cosmological constant derived via galaxy groups and clusters

Cluster Assembly Times as a Cosmological Test

Contact Info

Product

Resources

About