Implications for cosmology from ground-based Cosmic Microwave Background observations

Wang, Ke; Huang, Qing-Guo

doi:10.1088/1475-7516/2020/06/045

Cited by 9 publications

(4 citation statements)

References 63 publications

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“…The scenario described by the action in equation (102) with F(σ) = 1 + ξσ 2 and with the potential V(σ) = λσ 4 /4 (λ is a free parameter) has been recently studied in reference [859], where it has been named 'early modified gravity model'. 27 For this model, the combination of the Planck 2018 + BAO + FS + Pantheon + R19 + H0LiCOW datasets gives H 0 = 71.00 +0. 87 −0.79 km s −1 Mpc −1 at 68% CL [859], reducing the Hubble tension at 1.4σ with R20.…”

Section: F(q) Gravity Theorymentioning

confidence: 98%

“…Indeed, the combination of ACT (from = 600 in TT and = 350 in TE/EE) and WMAP data, with a Gaussian prior on τ instead of the low-polarization likelihood, results in H 0 = 67.6 ± 1.1 km s −1 Mpc −1 at 68% CL [26], always assuming a ΛCDM model, or H 0 = 67.9 ± 1.5 km s −1 Mpc −1 at 68% CL for ACT alone. Finally, a combination of ground based CMB experiments SPT, SPTPol, and the Atacama Cosmology Telescope polarimeter (ACTPol) gives H 0 = 69.72 ± 1.63 km s −1 Mpc −1 at 68% CL [27], while SPTPol + ACTPol, when combined with the Planck dataset, gives H 0 = 67.49 ± 0.53 km s −1 Mpc −1 at 68% CL [28].…”

Section: Earlymentioning

confidence: 99%

“…For Planck 2018 this model gives H 0 = 67.98 +0.63 −1.1 km s −1 Mpc −1 at 68% CL [863], reducing the Hubble tension at 3.7σ. 27 Note, that a different class of models with the same name 'early modified gravity' exists in the literature [860][861][862].…”

Section: F(q) Gravity Theorymentioning

confidence: 99%

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In the realm of the Hubble tension—a review of solutions ^*

Valentino

Mena²,

Pan³

et al. 2021

Class. Quantum Grav.

1,426

760

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The simplest ΛCDM model provides a good fit to a large span of cosmological data but harbors large areas of phenomenology and ignorance. With the improvement of the number and the accuracy of observations, discrepancies among key cosmological parameters of the model have emerged. The most statistically significant tension is the 4σ to 6σ disagreement between predictions of the Hubble constant, H 0, made by the early time probes in concert with the ‘vanilla’ ΛCDM cosmological model, and a number of late time, model-independent determinations of H 0 from local measurements of distances and redshifts. The high precision and consistency of the data at both ends present strong challenges to the possible solution space and demands a hypothesis with enough rigor to explain multiple observations—whether these invoke new physics, unexpected large-scale structures or multiple, unrelated errors. A thorough review of the problem including a discussion of recent Hubble constant estimates and a summary of the proposed theoretical solutions is presented here. We include more than 1000 references, indicating that the interest in this area has grown considerably just during the last few years. We classify the many proposals to resolve the tension in these categories: early dark energy, late dark energy, dark energy models with 6 degrees of freedom and their extensions, models with extra relativistic degrees of freedom, models with extra interactions, unified cosmologies, modified gravity, inflationary models, modified recombination history, physics of the critical phenomena, and alternative proposals. Some are formally successful, improving the fit to the data in light of their additional degrees of freedom, restoring agreement within 1–2σ between Planck 2018, using the cosmic microwave background power spectra data, baryon acoustic oscillations, Pantheon SN data, and R20, the latest SH0ES Team Riess, et al (2021 Astrophys. J. 908 L6) measurement of the Hubble constant (H 0 = 73.2 ± 1.3 km s−1 Mpc−1 at 68% confidence level). However, there are many more unsuccessful models which leave the discrepancy well above the 3σ disagreement level. In many cases, reduced tension comes not simply from a change in the value of H 0 but also due to an increase in its uncertainty due to degeneracy with additional physics, complicating the picture and pointing to the need for additional probes. While no specific proposal makes a strong case for being highly likely or far better than all others, solutions involving early or dynamical dark energy, neutrino interactions, interacting cosmologies, primordial magnetic fields, and modified gravity provide the best options until a better alternative comes along.

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Section: F(q) Gravity Theorymentioning

confidence: 98%

Section: Earlymentioning

confidence: 99%

See 1 more Smart Citation

In the realm of the Hubble tension—a review of solutions ^*

Valentino

Mena²,

Pan³

et al. 2021

Class. Quantum Grav.

1,426

760

View full text Add to dashboard Cite

show abstract

“…It emerges from the comparison between early-time and late-time measurements of the Hubble constant. From one side, CMB analysis [5,66,[105][106][107][108], BAO surveys [6,101,109,110] with standard BBN constraints [111] and combinations of CMB, BAO, SNIa [112], RSD and cosmic shear data [78,113,114] point towards lower values of H 0 (H 0 = 67.4 ± 0.5 km s −1 Mpc −1 from Planck 2018 [5]). On the other side, the local measurements based on standard candles prefer higher values for the Hubble constant [115] (H 0 = 73.04 ± 1.04 km s −1 Mpc −1 from SH0ES 2022 [17]).…”

Section: Hubble Tension In Light Of the Non-local Modelsmentioning

confidence: 99%

Addressing Cosmological Tensions by Non-Local Gravity

2022

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Alternative cosmological models have been under deep scrutiny in recent years, aiming to address the main shortcomings of the ΛCDM model. Moreover, as the accuracy of cosmological surveys improved, new tensions have risen between the model-dependent analysis of the Cosmic Microwave Background and lower redshift probes. Within this framework, we review two quantum-inspired non-locally extended theories of gravity, whose main cosmological feature is a geometrically driven accelerated expansion. The models are especially investigated in light of the Hubble and growth tension, and promising features emerge for the Deser–Woodard one. On the one hand, the cosmological analysis of the phenomenological formulation of the model shows a lowered growth of structures but an equivalent background with respect to ΛCDM. On the other hand, the study of the lensing features at the galaxy cluster scale of a new formulation of non-local cosmology, based on Noether symmetries, makes room for the possibility of alleviating both the H0 and σ8 tension. However, the urgent need for a screening mechanism arises for this non-local theory of gravity.

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Millicharged relics reveal massless dark photons

Berlin

Dror

Gan

et al. 2023

J. High Energ. Phys.

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The detection of massless kinetically-mixed dark photons is notoriously difficult, as the effect of this mixing can be removed by a field redefinition in vacuum. In this work, we study the prospect of detecting massless dark photons in the presence of a cosmic relic directly charged under this dark electromagnetism. Such millicharged particles, in the form of dark matter or dark radiation, generate an effective dark photon mass that drives photon-to-dark photon oscillations in the early universe. We also study the prospect for such models to alleviate existing cosmological constraints on massive dark photons, enlarging the motivation for direct tests of this parameter space using precision terrestrial probes.

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Implications for cosmology from ground-based Cosmic Microwave Background observations

Cited by 9 publications

References 63 publications

In the realm of the Hubble tension—a review of solutions ^*

In the realm of the Hubble tension—a review of solutions ^*

Addressing Cosmological Tensions by Non-Local Gravity

Millicharged relics reveal massless dark photons

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Implications for cosmology from ground-based Cosmic Microwave Background observations

Cited by 9 publications

References 63 publications

In the realm of the Hubble tension—a review of solutions *

In the realm of the Hubble tension—a review of solutions *

Addressing Cosmological Tensions by Non-Local Gravity

Millicharged relics reveal massless dark photons

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Product

Resources

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In the realm of the Hubble tension—a review of solutions ^*

In the realm of the Hubble tension—a review of solutions ^*