Does Λ CDM really be in tension with the Hubble diagram data?
Abstract
In this article, we elaborate further on the Λ CDM "tension", suggested recently by the authors Lusso et al. (Astron Astrophys 628:L4, 2019) and Risaliti and Lusso (Nat Astron 3(3):272, 2019). We combine Supernovae type Ia (SNIa) with quasars (QSO) and Gamma Ray Bursts (GRB) data in order to reconstruct in a model independent way the Hubble relation to as high redshifts as possible. Specifically, in the case of either SNIa or SNIa/QSO data we find that the current values of the cosmokinetic parameters extracted from the Gaussian process are consistent with those of Λ CDM. Including GRBs in the analysis we find a tension, which lies between 2 σ and 3 σ levels respectively. Finally, we find that at high redshifts (z >1 ) the corresponding cosmokinetic parameters significantly deviate from those of Λ CDM, hence the possibility of new Physics is not precluded by the present analysis.
- Publication:
-
European Physical Journal C
- Pub Date:
- July 2020
- DOI:
- 10.1140/epjc/s10052-020-8221-2
- arXiv:
- arXiv:2002.12577
- Bibcode:
- 2020EPJC...80..632M
- Keywords:
-
- Astrophysics - Cosmology and Nongalactic Astrophysics
- E-Print:
- Match the version published in EPJC