Can the tension in the $H_0$ estimation be solved by a local
overdensity?
A. Romano, and S. Vallejo. (2014)cite arxiv:1403.2034Comment: 5 pages, 3 fig.
Abstract
Recent measurements of the cosmic microwave background (CMB) radiation show
an apparent tension with the present value of the Hubble parameter inferred
from local observations of supernovae. We examine the possibility that such a
discrepancy is the consequence of the presence of a local inhomogeneity, and
find that a local overdensity could in fact account for the difference or at
least for part of it. While such a small inhomogeneity would not significantly
affect the distance to the last scattering, and consequently the value of $H_0$
obtained from CMB observations, it can have an important effect on the local
estimation of $H(z)$, since this is sensitive to the derivative of the
luminosity distance. The apparent tension can in fact be solved by correctly
extrapolating $H_0$ from the low redshift supernovae observations by taking
into account the effects of a local inhomogeneity on the distance redshift
relation. To fully explain the difference we find that we need to be located in
a region about $45%$ denser than where supernovae are located. Smaller
inhomogeneities can still introduce important corrections to the apparent value
of $H_0^app$ obtained from observational data under the assumption of
homogeneity, and need to be considered in the high precision cosmology era in
which we are entering.
Description
Can the tension in the $H_0$ estimation be solved by a local
overdensity?
%0 Generic
%1 romano2014tension
%A Romano, Antonio Enea
%A Vallejo, Sergio Andrés
%D 2014
%K inhomogeneity
%T Can the tension in the $H_0$ estimation be solved by a local
overdensity?
%U http://arxiv.org/abs/1403.2034
%X Recent measurements of the cosmic microwave background (CMB) radiation show
an apparent tension with the present value of the Hubble parameter inferred
from local observations of supernovae. We examine the possibility that such a
discrepancy is the consequence of the presence of a local inhomogeneity, and
find that a local overdensity could in fact account for the difference or at
least for part of it. While such a small inhomogeneity would not significantly
affect the distance to the last scattering, and consequently the value of $H_0$
obtained from CMB observations, it can have an important effect on the local
estimation of $H(z)$, since this is sensitive to the derivative of the
luminosity distance. The apparent tension can in fact be solved by correctly
extrapolating $H_0$ from the low redshift supernovae observations by taking
into account the effects of a local inhomogeneity on the distance redshift
relation. To fully explain the difference we find that we need to be located in
a region about $45%$ denser than where supernovae are located. Smaller
inhomogeneities can still introduce important corrections to the apparent value
of $H_0^app$ obtained from observational data under the assumption of
homogeneity, and need to be considered in the high precision cosmology era in
which we are entering.
@misc{romano2014tension,
abstract = {Recent measurements of the cosmic microwave background (CMB) radiation show
an apparent tension with the present value of the Hubble parameter inferred
from local observations of supernovae. We examine the possibility that such a
discrepancy is the consequence of the presence of a local inhomogeneity, and
find that a local overdensity could in fact account for the difference or at
least for part of it. While such a small inhomogeneity would not significantly
affect the distance to the last scattering, and consequently the value of $H_0$
obtained from CMB observations, it can have an important effect on the local
estimation of $H(z)$, since this is sensitive to the derivative of the
luminosity distance. The apparent tension can in fact be solved by correctly
extrapolating $H_0$ from the low redshift supernovae observations by taking
into account the effects of a local inhomogeneity on the distance redshift
relation. To fully explain the difference we find that we need to be located in
a region about $45%$ denser than where supernovae are located. Smaller
inhomogeneities can still introduce important corrections to the apparent value
of $H_0^{app}$ obtained from observational data under the assumption of
homogeneity, and need to be considered in the high precision cosmology era in
which we are entering.},
added-at = {2014-03-19T10:36:55.000+0100},
author = {Romano, Antonio Enea and Vallejo, Sergio Andrés},
biburl = {https://www.bibsonomy.org/bibtex/2ab6686b60181d0e511f2a40cc3504463/ryankeenan},
description = {Can the tension in the $H_0$ estimation be solved by a local
overdensity?},
interhash = {5995552378f1b12a3fe0fc082df865ba},
intrahash = {ab6686b60181d0e511f2a40cc3504463},
keywords = {inhomogeneity},
note = {cite arxiv:1403.2034Comment: 5 pages, 3 fig},
timestamp = {2014-03-19T10:36:55.000+0100},
title = {Can the tension in the $H_0$ estimation be solved by a local
overdensity?},
url = {http://arxiv.org/abs/1403.2034},
year = 2014
}