$$H_0$$ tension: clue to common nature of dark sector?

Abstract

The recently sharpened H 0 tension is argued not to be a result of data calibration or any other systematic feature, but an indication for the common nature of dark matter and dark energy. This conclusion is drawn within modified weak-field General Relativity where the accelerated expansion of the Universe and the dynamics of galaxy groups and clusters are described by the same parameter, the cosmological constant. The common nature of the dark sector hence will result in an intrinsic discrepancy/tension between the local and global determinations of the values of the Hubble constant.

Black hole shadow to probe modified gravity

“…In this Letter, we consider the possibility to use the M87* shadow available information to constraint the Schwarzschild-de Sitter (SdS) and Kerr-de Sitter (KdS) BHs, i.e., taking into account the cosmological constant Λ in the metric. The Λ-term in the spherically symmetric metric is arising also in the modified weak-field general relativity (GR) which enables to consider the common nature of the dark energy and dark matter [9][10][11][12]. That approach also suggests a test for the potential deviations from GR having in view of the value of the cosmological constant Λ = 1.11 × 10 −52 m −2 [13] using the gravity lensing observations [14].…”

On the role of $$\varLambda $$ on accretion disks

“…At the same time, the observational indications for the dark matter and dark energy have triggered the study of variety of modified gravity models. Among the considered modified gravity models is the one involving the cosmological constant in the weak-field limit of GR [8][9][10]. Λ acts as second gravity constant along with the Newtonian constant G, as one of the fundamental constants of Universe [11].…”

“…The influence of Λ on various effects and the possibility to obtain constraints associated with Λ-term is considered in [16][17][18][19][20]. Particularly, it was shown that the Λ-term is able to provide a solution for the Hubble tension problem [21].…”

Lense–Thirring precession and gravito–gyromagnetic ratio

“…known as the Schwarzschild-de Sitter metric [12]. This metric arises also as the weak-field limit of GR in view of the Newton theorem on the "sphere-point" equivalence [13][14][15][16].…”

“…Within McCrea-Milne cosmology it enables one to consider e.g. the observed galactic flow in the vicinity of the Local Group [18,19]. The appearance of Λ in the above relations can be given a clear group-theoretical background.…”