The Local Perspective on the Hubble Tension: Local Structure Does Not Impact Measurement of the Hubble Constant. (arXiv:1901.08681v1 [astro-ph.CO])
<a href="http://arxiv.org/find/astro-ph/1/au:+Kenworthy_W/0/1/0/all/0/1">W. D'Arcy Kenworthy</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Scolnic_D/0/1/0/all/0/1">Dan Scolnic</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Riess_A/0/1/0/all/0/1">Adam Riess</a>
We use the largest sample to date of spectroscopic SN Ia distances and We use the largest sample to date of spectroscopic SN Ia distances and http://arxiv.org/icons/sfx.gif
redshifts to look for evidence in the Hubble diagram of large scale outflows
caused by local voids suggested to exist at z<0.15 . Our sample combines data
from the Pantheon sample with the Foundation survey and the most recent release
of lightcurves from the Carnegie Supernova Project to create a sample of 1295
SNe over a redshift range of 0.01
delta = Delta-rho / rho) proposed in some galaxy count studies, and find no
evidence of a change in the Hubble constant corresponding to a void with a
sharp edge in the redshift range 0.023
redshifts to look for evidence in the Hubble diagram of large scale outflows
caused by local voids suggested to exist at z<0.15 . Our sample combines data
from the Pantheon sample with the Foundation survey and the most recent release
of lightcurves from the Carnegie Supernova Project to create a sample of 1295
SNe over a redshift range of 0.01<z<2.26. We make use of an inhomogeneous and
isotropic Lemaitre-Tolman-Bondi metric to model a void in the SN Ia
distance-redshift relation. We conclude that the SN luminosity
distance-redshift relation is inconsistent at the 4-5 sigma confidence level
with large local underdensities (|delta| > 20%, where the density contrast
delta = Delta-rho / rho) proposed in some galaxy count studies, and find no
evidence of a change in the Hubble constant corresponding to a void with a
sharp edge in the redshift range 0.023<z<0.15. We conclude that the
distance-ladder value of H_0, with a current precision of sigma H_0=2.2%, is
not significantly affected by local density contrasts, with an empirical
precision of sigma H_0 ~ 0.60%, in agreement with cosmic variance in the Hubble
constant of sigma H_0 = 0.42% predicted from simulations of large-scale
structure. We derive a 5 sigma constraint on local density contrasts on scales
larger than 69 Mpc h^-1 of |delta| < 27%. The presence of local structure does
not appear to impede the possibility of measuring the Hubble constant to 1%
precision.
