The bulk flow in  uLCDM and XCDMand the Hubble constant and sigma8 tensions

ShiekhAnsari, Parnaz; Baghram, Shant

doi:10.47176/ijpr.23.1.31667

The bulk flow in uLCDM and XCDMand the Hubble constant and sigma8 tensions

Document Type : Original Article

Authors

Parnaz ShiekhAnsari

Shant Baghram

Faculty of Physics, Sharif University of Technology, Tehran, Iran

https://doi.org/10.47176/ijpr.23.1.31667

Abstract

The standard model of cosmology,, has been successful in describing many observations. With the improvement of the number and the accuracy of observations, some inconsistencies among key cosmological parameters of the model have emerged. Many alternative models are proposed to alleviate these tensions. On the other hand, some observations of peculiar velocity show higher values than expected in a universe which may contradict the cosmological principle. In this work, we used linear perturbation theory to measure bulk flow and parameter in two alternative cosmological models and XCDM. We compared measured bulk flows with the predictions and some observations. We did a analysis to see which model is preferred by data. We find that model predicts higher bulk flows and is more consistent with observational data but does not reduce tension. Bulk flows measured in the XCDM model are lower compared to . However, this model can reconcile tension.

Keywords

structure formation

cosmological perturbation theory

bulk flow

cosmological tensions

Subjects

Gravitation and Cosmology

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