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Cosmography and flat $\Lambda$CDM tensions at high redshift · Around 2019
Cosmography and flat $\Lambda$CDM tensions at high redshift Yang, Tao, Banerjee, Aritra, Colgáin, Eoin Ó
Understand Risaliti, Lusso \& collaborators have constructed a high-redshift Hubble diagram of supernovae (SNe); quasars (QSO) and gamma-ray bursts (GRB) that shows a "$\sim 4 \, \sigma$ tension with the $\Lambda$CDM model" based on a log polynomial cosmographic expansion (Risaliti et.al 2018, Lusso et.al 2019).
In this work, we demonstrate that the log polynomial expansion generically fails to recover flat $\Lambda$CDM beyond $z \sim 2$, thus undermining the $\sim 4 \, \sigma$ tension claim. Moreover, through direct fits of both the flat $\Lambda$CDM and the log polynomial model to the SNe+QSO+GRB dataset, we confirm that the flat $\Lambda$CDM model is preferred. Ultimately, we trace the tension to the QSO data and show that a best-fit of the flat $\Lambda$CDM model to the QSO data leads to a flat $\Lambda$CDM Universe with no dark energy within $1 \, \sigma$.
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G. Risaliti and E. Lusso, “Cosmological constraints from the Hubble diagram of quasars at high redshifts,” Nat. Astron. 3
2019
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E. Lusso, E. Piedipalumbo, G. Risaliti, M. Paolillo, S. Bisogni, E. Nardini and L. Amati, “Tension with the flat Λ \Lambda CDM model from a high redshift Hubble Diagram of supernovae, quasars and gamma-ray bursts,” Astron. Astrophys. 628
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Maurice H P M van Putten “Alleviating tension in Λ \Lambda CDM and the local distance ladder from first principles with no free parameters,” MNRAS Volume 491, Issue 1, January 2020, Pages L6-L10
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