Hubble Hullabaloo and String Cosmology

Anchordoqui, Luis A.

doi:10.48550/arxiv.2005.01217

Cited by 5 publications

(6 citation statements)

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“…• For considerations of CMB + BAO + Pantheon data, string-inspired models with coupling between the DE and DM sectors characterized by P 10 tend to fall short of fully resolving the H 0 tension [128]. The addition of extra-relativistic degrees of freedom (e.g., by considering 3 right-handed Dirac neutrinos ubiquitous in D-brane constructs [129,135], or thermal axions [68][69][70][71][72][73][74], or sterile neutrinos [64][65][66][67] One dimensional posterior distributions and two dimensional joint contours for the parameter space P 0 ≡ Ω b h 2 , Ω c h 2 , 100θ MC , τ, n s , ln[10 10 A s ] for CMB alone and CMB + BAO + Pantheon (referred to as 'all') dataset. The H 0 and r drag parameters are respectively measured in [km/s/Mpc] and [Mpc] in all the triangular plots of this work.…”

Section: Discussionmentioning

confidence: 99%

Dissecting the $H_0$ and $S_8$ tensions with Planck + BAO + supernova type Ia in multi-parameter cosmologies

Anchordoqui,

Di Valentino,

Pan

et al. 2021

Preprint

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The mismatch between the locally measured expansion rate of the universe and the one inferred from observations of the cosmic microwave background (CMB) assuming the canonical ΛCDM model has become the new cornerstone of modern cosmology, and many new-physics set ups are rising to the challenge. Concomitant with the so-called H 0 problem, there is evidence of a growing tension between the CMB-preferred value and the local determination of the weighted amplitude of matter fluctuations S 8 . It would be appealing and compelling if both the H 0 and S 8 tensions were resolved at once, but as yet none of the proposed new-physics models have done so to a satisfactory degree. Herein, we adopt a systematic approach to investigate the possible interconnection among the free parameters in several classes of models that typify the main theoretical frameworks tackling the tensions on the universe expansion rate and the clustering of matter. Our calculations are carried out using the publicly available Boltzmann solver CAMB in combination with the sampler CosmoMC. We show that even after combining the leading classes of models sampling modifications of both the early and late-time universe a simultaneous solution to the H 0 and S 8 tensions remains elusive.

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Section: Discussionmentioning

confidence: 99%

Dissecting the $H_0$ and $S_8$ tensions with Planck + BAO + supernova type Ia in multi-parameter cosmologies

Anchordoqui,

Di Valentino,

Pan

et al. 2021

Preprint

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“…The canonical example of (1) features the addition of 3 superweakly-interacting right-handed (Dirac) neutrinos, which decouple around the QCD phase transition [610]. This model can be framed within the context of intersecting D-brane models of vibrating strings, and the extra-gauge boson could be within reach of the LHC Run-3 [611,612]. On the other hand, SIDR models are in local thermal equilibrium and behave as perfect fluids [613][614][615][616].…”

Section: Extra Relativistic Degrees Of Freedommentioning

confidence: 99%

“…• CERN's LHC experiments ATLAS and CMS will provide complementary information by searching for the elusive DM particle and hyperweak gauge interactions of light relics [33,612,1831,1832]. In addition, the ForwArd Search ExpeRiment (FASER) will search for light hyperweakly-interacting particles produced in the LHC's high-energy collisions in the far-forward region [1833][1834][1835].…”

Section: λCdm and The Dark Matter Phenomenon At Galactic Scalesmentioning

confidence: 99%

Cosmology Intertwined: A Review of the Particle Physics, Astrophysics, and Cosmology Associated with the Cosmological Tensions and Anomalies

Abdalla,

Abellán,

Aboubrahim

et al. 2022

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This White Paper has been prepared to fulfill SNOWMASS 2021 requirements and it extends the material previously summarized in the four Letters of Interest [1][2][3][4]. The Particle Physics Community Planning Exercise (a.k.a. SNOWMASS ) is organized by the Division of Particles and Fields of the American Physical Society, and this is an effort to bring together the community of theoretical physicists and cosmologists and identify promising opportunities to address the questions described.This White Paper was initiated with the aim of identifying the opportunities in the cosmological field for the next decade, and strengthening the coordination of the community. It is addressed to identifying the most promising directions of investigation, and rather than attempting a long review of the current status of the whole field of research, it focuses on the upcoming theoretical opportunities and challenges described. The White Paper is a collaborative effort led by Eleonora Di Valentino and Luis Anchordoqui, and it is organized in the topics listed below, each of them coordinated by the scientists indicated (alphabetical order):

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“…See also Ref [457]. for the implications in light of the Hubble tension of the interplay between the cosmological determination of ∆N eff and Z .…”

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confidence: 99%

In the Realm of the Hubble tension $-$ a Review of Solutions

Di Valentino,

Mena,

Pan

et al. 2021

Preprint

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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 850 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 [2] 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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Hubble Hullabaloo and String Cosmology

Cited by 5 publications

References 63 publications

Dissecting the $H_0$ and $S_8$ tensions with Planck + BAO + supernova type Ia in multi-parameter cosmologies

Dissecting the $H_0$ and $S_8$ tensions with Planck + BAO + supernova type Ia in multi-parameter cosmologies

Cosmology Intertwined: A Review of the Particle Physics, Astrophysics, and Cosmology Associated with the Cosmological Tensions and Anomalies

In the Realm of the Hubble tension $-$ a Review of Solutions

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