Why reducing the cosmic sound horizon can not fully resolve the Hubble tension

Jedamzik, Karsten; Pogosian, Levon; Zhao, Gong-Bo

doi:10.21203/rs.3.rs-100387/v1

Cited by 14 publications

(20 citation statements)

References 23 publications

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“…However, this is accompanied by a comparable S 8 ¼ 0.833 þ0.016 −0.022 for EMG with ξ ¼ −1=6 and a smaller S 8 ¼ 0.822 AE 0.011 for ξ ¼ −1=6, λ ¼ 0, since H 0 is smaller and therefore the shift in the value of ω c necessary to restore the fit with CMB data is slightly smaller as well. This is again in line with the observation that models that lead to a larger H 0 modifying the sound horizon inevitably lead to a larger ω c and therefore S 8 [135].…”

Section: The ξ = − 1=6 Casesupporting

confidence: 90%

Early modified gravity in light of the H0 tension and LSS data

et al. 2021

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We present a model of early modified gravity (EMG) consisting in a scalar field σ with a nonminimal coupling to the Ricci curvature of the type M 2 pl þ ξσ 2 plus a cosmological constant and a small effective mass and demonstrate its ability to alleviate the H 0 tension while providing a good fit to cosmic microwave background (CMB) anisotropies and baryon acoustic oscillations (BAO) data. In this model the scalar field, frozen deep in the radiation era, grows around the redshift of matter-radiation equality because of the coupling to nonrelativistic matter. The small effective mass, which we consider here as induced by a quartic potential, then damps the scalar field into coherent oscillations around its minimum at σ ¼ 0, leading to a weaker gravitational strength at early times and naturally recovering the consistency with laboratory and Solar System tests of gravity. We analyze the capability of EMG with positive ξ to fit current cosmological observations and compare our results to the case without an effective mass and to the popular early dark energy models with ξ ¼ 0. We show that EMG with a quartic coupling of the order of λ ∼ OðeV 4 =M 4 pl Þ can substantially alleviate the H 0 tension also when the full shape of the matter power spectrum is included in the fit in addition to CMB and Supernovae (SN) data.

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Section: The ξ = − 1=6 Casesupporting

confidence: 90%

Early modified gravity in light of the H0 tension and LSS data

et al. 2021

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“…It should be stressed that we have not specified a redshift where the EoS differs from flat ΛCDM, and it is conceivable that some variation in the early Universe is required, as argued in [63][64][65], for example [66][67][68][69][70] (see [71][72][73][74][75][76][77] for related discussion). Given probes of the pre-CMB Universe are limited, this may preclude us from observing a running in H 0 .…”

Section: Discussionmentioning

confidence: 99%

Running Hubble tension and a H0 diagnostic

et al. 2021

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Hubble tension is routinely presented as a mismatch between the Hubble constant H 0 determined locally and a value inferred from the flat ΛCDM cosmology. In essence, the tension boils down to a disagreement between two numbers. Here, assuming the tension is cosmological in origin, we predict that within flat ΛCDM there should be other inferred values of H 0 , and that a "running of H 0 with redshift" can be expected. These additional determinations of H 0 may be traced to a difference between the effective equation of state (EoS) of the Universe within the Friedmann-Lemaître-Robertson-Walker (FLRW) cosmology framework and the current standard model. We introduce a diagnostic that flags such a running of H 0 .

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“…However, an actual analysis could potentially reveal the preference of higher neutrino masses which will yield a smaller value of S 8 as relevant for weak lensing measurements of this parameter, see e.g. [139].…”

Section: Discussionmentioning

confidence: 99%

The hubble tension as a hint of leptogenesis and neutrino mass generation

Escudero

Witte

2021

Eur. Phys. J. C

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The majoron, a neutrinophilic pseudo-Goldstone boson conventionally arising in the context of neutrino mass models, can damp neutrino free-streaming and inject additional energy density into neutrinos prior to recombination. The combination of these effects for an eV-scale mass majoron has been shown to ameliorate the outstanding $$H_0$$ H 0 tension, however only if one introduces additional dark radiation at the level of $$\Delta N_{\mathrm{eff}} \sim 0.5$$ Δ N eff ∼ 0.5 . We show here that models of low-scale leptogenesis can naturally source this dark radiation by generating a primordial population of majorons from the decays of GeV-scale sterile neutrinos in the early Universe. Using a posterior predictive distribution conditioned on Planck2018+BAO data, we show that the value of $$H_0$$ H 0 observed by the SH$$_0$$ 0 ES collaboration is expected to occur at the level of $$\sim 10\%$$ ∼ 10 % in the primordial majoron cosmology (to be compared with $$\sim 0.1\%$$ ∼ 0.1 % in the case of $$\Lambda $$ Λ CDM). This insight provides an intriguing connection between the neutrino mass mechanism, the baryon asymmetry of the Universe, and the discrepant measurements of $$H_0$$ H 0 .

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Why reducing the cosmic sound horizon can not fully resolve the Hubble tension

Cited by 14 publications

References 23 publications

Early modified gravity in light of the H0 tension and LSS data

Early modified gravity in light of the H0 tension and LSS data

Running Hubble tension and a H0 diagnostic

The hubble tension as a hint of leptogenesis and neutrino mass generation

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