Revealing intrinsic flat 
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 biases with standardizable candles

Colgáin, Eoin Ó; Sheikh-Jabbari, M. M.; Solomon, Rance; Bargiacchi, G.; Capozziello, Salvatore; Dainotti, Maria Giovanna; Stojković, Dejan

doi:10.1103/physrevd.106.l041301

Cited by 77 publications

(18 citation statements)

References 54 publications

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“…The reduction of the H 0 tension is 66%. A similar descending trend (i.e., H 0 decreasing as z min increases) was also found by Horstmann et al [61] and Ó Colgáin et al [491] from the Pantheon sample. The constraints of H 0 (z min ) are obtained by using the SNe Ia data larger than z min .…”

Section: Evidence Of New Physics Beyond the λCdmsupporting

confidence: 85%

Hubble Tension: The Evidence of New Physics

Hu¹,

Wang²

2023

Preprint

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Section: Evidence Of New Physics Beyond the λCdmsupporting

confidence: 85%

Hubble Tension: The Evidence of New Physics

Hu¹,

Wang²

2023

Preprint

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“…Two followup works further confirm this significant deviation with more precise approaches and cleaner QSO samples (Lusso et al 2019(Lusso et al , 2020. Since then, the deviation between the high-redshift QSOs Hubble diagram and the ΛCDM model arises heated debates (Melia 2019;Yang et al 2020;Velten & Gomes 2020;Mehrabi & Basilakos 2020;Zheng et al 2021;Lian et al 2021;Colgáin et al 2022;Li et al 2021;Khadka & Ratra 2021.…”

Section: Introductionmentioning

confidence: 86%

Redshift Evolution and Non-Universal Dispersion of Quasar Luminosity Correlation

Li¹,

Lu²,

Wang³

2022

Preprint

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The standard ΛCDM model is recently reported to deviate from the high-redshift Hubble diagram of type Ia supernovae (SNe) and quasars (QSOs) at ∼ 4𝜎 confidence level. In this work, we combine the PAge approximation (a nearly model-independent parameterization) and a high-quality QSO sample to search for the origins of the deviation. By visualizing the ΛCDM model and the marginalized 3𝜎 constraints of SNe+QSOs into PAge space, we confirm that the SNe+QSOs constraints in both flat and non-flat PAge cases are in remarkable tension with the standard ΛCDM cosmology. Next, we investigate the tension from the perspective of redshift-evolution effects. We find that the QSO correlation coefficient 𝛾 calibrated by SNe+low-z QSOs and SNe+high-z QSOs shows ∼ 2.7𝜎 and ∼ 4𝜎 tensions in flat and non-flat universes, respectively. The tensions for intrinsic dispersion 𝛿 between different data sets are found to be > 4𝜎 in both flat and non-flat cases. These results indicate that the QSO luminosity correlation suffers from significant redshift evolution and non-universal intrinsic dispersion. Using a redshiftdependence correlation to build QSO Hubble diagram could lead to biases. Thus, the ∼ 4𝜎 deviation from the standard ΛCDM probably originates from the redshift-evolution effects and non-universal dispersion of the QSO luminosity correlation rather than new physics.

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“…The values assumed are compatible (exceeding only by one extreme case for N ef f = 3.95) with observational data (using Planck TT+lowE [1]), since Planck constrains in this data analysis w = −1.57 +0.60 −0.48 and N ef f = 3.00 +0. 57 −0.53 at 95%.…”

Section: Methodsmentioning

confidence: 99%

“…In the case of quintessence,[52], or any late-time dark energy model with an equation of state w > −1[53], one can prove that H 0 is always sent to lower values, implying in severe constraints to such models 2. Note that H 0 is a fitting parameter in the flat ΛCDM model and one can assume it may be not a constant (see, for example, Refs [55][56][57]. for the possibility of evolution of H 0 in the late universe).…”

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confidence: 99%

An empirical investigation into cosmological tensions

Sá¹,

Benetti²,

Graef³

2022

Preprint

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The possibility that the H0 tension is a sign of a physics beyond the ΛCDM model is one of the most exciting possibilities in modern cosmology. The challenge of solving this problem is complicated by several factors, including the worsening of the tension on σ8 parameter when that on H0 is raised. Furthermore, the perspective from which the problem is viewed should not be underestimated, since the tension on H0 can also be interpreted as a tension on the size of the acoustic horizon, rs, which deserves proper discussion. The common approach in the literature consists in proposing a new model that can resolve the tension and treat the new parameters of the theory as free in the analysis. However, allowing additional parameters to vary often results in larger uncertainties on the inferred cosmological parameters, causing an apparent relaxing in the tension due to the broaden in the posterior, instead of a genuine shift in the central value of H0. To avoid this, we consider here an empirical approach that assumes specific non-standard values of the ΛCDM extensions and we analyze how the important parameters in the context of the tension vary accordingly. For our purposes, we study simple extensions of the standard cosmological model, such as a phantom DE component (with Equation of State w < −1) and extra relativistic species in the early universe (so that N ef f > 3.046). We obtain relations between variation in the value of w and N ef f and changes in H0, rs and σ8. In this way an empirical relation between H0 and σ8 is provided, that is a first step in understanding which classes of theoretical models, and with which characteristics, could be able to break the correlation between the two tensions.

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Revealing intrinsic flat ΛCDM biases with standardizable candles

Cited by 77 publications

References 54 publications

Hubble Tension: The Evidence of New Physics

Hubble Tension: The Evidence of New Physics

Redshift Evolution and Non-Universal Dispersion of Quasar Luminosity Correlation

An empirical investigation into cosmological tensions

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