Role of Early Dark Matter in the Hubble Tension Problem

The so-called Hubble Tension, or the significant variation in the values obtained for the cosmological Hubble Constant (H_0) by using different astrophysical techniques, is of major concern for astrophysicists. One possible major source suggested for this uncertainty is the role of the Early Dark Matter (DM). We continue the work by our theory group on astronomy problems of general interest, in this paper. Combining data from Cosmic Microwave Background (CMB), Baryon Acoustic Oscillation, and type Ia Supernovae, it has been shown that if the mechanism behind the production of dark matter particles has at least a small non-thermal origin, larger values of the Hubble rate H_0, within the lambda_CDM, are induced, to help alleviate the trouble with H_0. For the space-based GW detector, TianQin, the H_0 can be constrained within a relative error of ∼ 0.3-2%. We present here the result of our simulations of the effects of distrubances in Space-Time (ST) structure on H_0 measurements. These simulations were performed with the Python and C++ languages.