The BAO+BBN take on the Hubble tension

Schöneberg, Nils; Lesgourgues, Julien; Hooper, Deanna C.

doi:10.1088/1475-7516/2019/10/029

Cited by 230 publications

(205 citation statements)

References 69 publications

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“…It is worth while mentioning that the baryon acoustic oscillation probe based on galaxy surveys combined with big bang nucleosynthesis data, gives an independent estimate of H0 = 68.3 +1.1 −1.2 km s −1 Mpc −1 (Schöneberg, Lesgourgue & Hooper 2019) which is close to the Planck-derived H0 value. These are important results, but discussing them goes beyond the scope of this paper.…”

Section: Introductionsupporting

confidence: 74%

Distant foreground and the Planck-derived Hubble constant

Yershov

Raikov

Lovyagin

et al. 2020

Monthly Notices of the Royal Astronomical Society

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It is possible to reduce the discrepancy between the local measurement of the cosmological parameter H 0 and the value derived from the Planck measurements of the Cosmic Microwave Background (CMB) by considering contamination of the CMB by emission from some medium around distant extragalactic sources, such as extremely cold coarse-grain dust. Though being distant, such a medium would still be in the foreground with respect to the CMB, and, as any other foreground, it would alter the CMB power spectrum. This could contribute to the dispersion of CMB temperature fluctuations. By generating a few random samples of CMB with different dispersions, we have checked that the increased dispersion leads to a smaller estimated value of H 0 , the rest of the cosmological model parameters remaining fixed. This might explain the reduced value of the Planck-derived parameter H 0 with respect to the local measurements. The signature of the distant foreground in the CMB traced by SNe was previously reported by the authors of this paper -we found a correlation between the SN redshifts, z SN , and CMB temperature fluctuations at the SNe locations, T SN . Here we have used the slopes of the regression lines T SN / z SN corresponding to different Planck wave bands in order to estimate the possible temperature of the distant extragalactic medium, which turns out to be very low, about 5 K. The most likely ingredient of this medium is coarse-grain (grey) dust, which is known to be almost undetectable, except for the effect of dimming remote extragalactic sources.

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Section: Introductionsupporting

confidence: 74%

Distant foreground and the Planck-derived Hubble constant

Yershov

Raikov

Lovyagin

et al. 2020

Monthly Notices of the Royal Astronomical Society

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“…The left panel of Fig. 1 [54,55]. Interesting to note that the H 0 − m plane, from θ B AO data, also tends to be positively correlated, but generating high H 0 values.…”

Section: Resultsmentioning

confidence: 87%

BAO signatures in the 2-point angular correlations and the Hubble tension

Nunes

Bernui

2020

Eur. Phys. J. C

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An observational tension on estimates of the Hubble parameter, $$H_0$$ H 0 , using early and late Universe information, is being of intense discussion in the literature. Additionally, it is of great importance to measure $$H_0$$ H 0 independently of CMB data and local distance ladder method. In this sense, we analyze 15 measurements of the transversal BAO scale, $$\theta _\mathrm{BAO}$$ θ BAO , obtained in a weakly model-dependent approach, in combination with other data sets obtained in a model-independent way, namely, Big Bang Nucleosynthesis (BBN) information, 6 gravitationally lensed quasars with measured time delays by the H0LiCOW team, and measures of cosmic chronometers (CC). We find $$H_0 = 74.88_{-2.1}^{+1.9}$$ H 0 = 74 . 88 - 2.1 + 1.9 km s$${}^{-1}$$ - 1 Mpc$${}^{-1}$$ - 1 and $$H_0 = 72.06_{-1.3}^{+1.2}$$ H 0 = 72 . 06 - 1.3 + 1.2 km s$${}^{-1}$$ - 1 Mpc$${}^{-1}$$ - 1 from $$\theta _{BAO}$$ θ BAO +BBN+H0LiCOW and $$\theta _{BAO}$$ θ BAO +BBN+CC, respectively, in fully accordance with local measurements. Moreover, we estimate the sound horizon at drag epoch, $$r_\mathrm{d}$$ r d , independent of CMB data, and find $$r_\mathrm{d}=144.1_{-5.5}^{+5.3}$$ r d = 144 . 1 - 5.5 + 5.3 Mpc (from $$\theta _{BAO}$$ θ BAO +BBN+H0LiCOW) and $$r_\mathrm{d} =150.4_{-3.3}^{+2.7}$$ r d = 150 . 4 - 3.3 + 2.7 Mpc (from $$\theta _{BAO}$$ θ BAO +BBN+CC). In a second round of analysis, we test how the presence of a possible spatial curvature, $$\Omega _k$$ Ω k , can influence the main results. We compare our constraints on $$H_0$$ H 0 and $$r_\mathrm{d}$$ r d with other reported values. Our results show that it is possible to use a robust compilation of transversal BAO data, $$\theta _{BAO}$$ θ BAO , jointly with other model-independent measurements, in such a way that the tension on the Hubble parameter can be alleviated.

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“…Such model would fully resolve the Hubble tension, while having interesting consequences for laboratory experiments. Unfortunately, the simplest realization of this model is strongly constrained 24 Alternatively, it is possible to measure rs(z drag ) by combining BAO and the value of w b obtained from BBN [765,766,767]. 25 These bounds were derive assuming massless products.…”

Section: Probing Perturbation Dynamics With Cmbmentioning

confidence: 99%

The First Three Seconds: a Review of Possible Expansion Histories of the Early Universe

Allahverdi¹,

Amin²,

Berlin³

et al. 2021

TheOJA

200

140

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It is commonly assumed that the energy density of the Universe was dominated by radiation between reheating after inflation and the onset of matter domination 54,000 years later. While the abundance of light elements indicates that the Universe was radiation dominated during Big Bang Nucleosynthesis (BBN), there is scant evidence that the Universe was radiation dominated prior to BBN. It is therefore possible that the cosmological history was more complicated, with deviations from the standard radiation domination during the earliest epochs. Indeed, several interesting proposals regarding various topics such as the generation of dark matter, matter-antimatter asymmetry, gravitational waves, primordial black holes, or microhalos during a nonstandard expansion phase have been recently made. In this paper, we review various possible causes and consequences of deviations from radiation domination in the early Universe -taking place either before or after BBN -and the constraints on them, as they have been discussed in the literature during the recent years.

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The BAO+BBN take on the Hubble tension

Cited by 230 publications

References 69 publications

Distant foreground and the Planck-derived Hubble constant

Distant foreground and the Planck-derived Hubble constant

BAO signatures in the 2-point angular correlations and the Hubble tension

The First Three Seconds: a Review of Possible Expansion Histories of the Early Universe

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