Open AccessGrey intergalactic dust could explain the Hubble constant tension
Author(s) -
V. N. Yershov,
А. А. Райков,
N. Yu. Lovyagin,
P. Kuin,
E. Popova
Publication year - 2022
Publication title -
astronomy at the epoch of multimessenger studies. proceedings of the vak-2021 conference, aug 23–28, 2021
Language(s) - English
Resource type - Conference proceedings
DOI - 10.51194/vak2021.2022.1.1.169
Subject(s) - cosmic microwave background , physics , astrophysics , planck , hubble's law , spectral density , cosmology , optics , anisotropy , statistics , dark energy , mathematics
It is possible to explain the discrepancy (tension) between the local measurement of the cosmological parameter H 0 (theHubble constant) and its value derived from the Planck-mission measurements of the Cosmic Microwave Background (CMB)by considering contamination of the CMB by emission from some medium surrounding distant extragalactic sources, such asextremely cold coarse-grain (grey) dust. Though being distant, such a medium would still be in the foreground with respectto the CMB, and, as any other foreground, it would alter the CMB power spectrum. This could contribute to the dispersionof CMB temperature uctuations. By generating random samples of CMB with dierent dispersions, we have checked thatthe increased dispersion leads to a smaller estimated value of H 0 , the rest of the cosmological model parameters remainingxed. This might explain the reduced value of the Planck-derived parameter H 0 with respect to the local measurements.