A number of challenges to the standard Λ CDM model have been emerging during the past
few years as the accuracy of cosmological observations improves. In this review we discuss …

Consistent observations indicate that some of the important cosmological parameters
measured through the local observations are in huge tension with their measurements from …

The Λ CDM model provides a good fit to most astronomical observations but harbors large
areas of phenomenology and ignorance. With the improvements in the precision and …

Abstract The standard Λ Cold Dark Matter (ΛCDM) cosmological model provides a good
description of a wide range of astrophysical and cosmological data. However, there are a …

Cosmological constraints are usually derived under the assumption of a six-parameter Λ
CDM theoretical framework or simple one-parameter extensions. In this paper we present …

Emerging high-redshift cosmological probes, in particular quasars (QSOs), show a
preference for larger matter densities, Ω m≈ 1, within the flat Λ CDM framework. Here, using …

Hubble constant H 0 and weighted amplitude of matter fluctuations S 8 determinations are
biased to higher and lower values, respectively, in the late universe with respect to early …

Despite the remarkable success of the Λ Cold Dark Matter (Λ CDM) cosmological model, a
growing discrepancy has emerged (currently measured at the level of∼ 4− 6 σ) between the …

Weak galaxy lensing surveys have consistently reported a lower amplitude for the matter
fluctuation spectrum, as measured by the S 8 parameter, than expected in the ΛCDM …

The current 3.8 σ tension between local [AG Riess et al., arXiv: 1804.10655.] and global [N.
Aghanim et al.(Planck Collaboration), Astron. Astrophys. 596, A107 (2016).] measurements …