%0 Generic %1 mcconville2023anisotropic %A McConville, Ruairí %A Colgáin, Eoin Ó %D 2023 %K tifr %T Anisotropic Hubble Expansion in Pantheon+ Supernovae %U http://arxiv.org/abs/2304.02718 %X We decompose the Pantheon+ Type Ia supernovae (SN) sample in hemispheres on the sky finding angular variations up to $4$ km/s/Mpc in the Hubble constant $H_0$ both in the SH0ES redshift range $0.0233 < z < 0.15$ and in the extended redshift range $0.01 < z < 0.7$. We assume the $Łambda$CDM model, so our findings become model dependent in extended redshift ranges. $H_0$ is larger in a hemisphere encompassing the CMB dipole direction. The variations we see exceed the errors on the recent SH0ES determination, $H_0 = 73.04 1.04$ km/s/Mpc, but are not large enough to explain early versus late Universe discrepancies in the Hubble constant. The removal of low redshift SN leads to a weakening of angular $H_0$ variations, but we confirm that they persist beyond the influence of the Shapley supercluster $z > 0.06$

@misc{mcconville2023anisotropic, abstract = {We decompose the Pantheon+ Type Ia supernovae (SN) sample in hemispheres on the sky finding angular variations up to $4$ km/s/Mpc in the Hubble constant $H_0$ both in the SH0ES redshift range $0.0233 < z < 0.15$ and in the extended redshift range $0.01 < z < 0.7$. We assume the $\Lambda$CDM model, so our findings become model dependent in extended redshift ranges. $H_0$ is larger in a hemisphere encompassing the CMB dipole direction. The variations we see exceed the errors on the recent SH0ES determination, $H_0 = 73.04 \pm 1.04$ km/s/Mpc, but are not large enough to explain early versus late Universe discrepancies in the Hubble constant. The removal of low redshift SN leads to a weakening of angular $H_0$ variations, but we confirm that they persist beyond the influence of the Shapley supercluster $z > 0.06$}, added-at = {2023-04-07T09:28:14.000+0200}, author = {McConville, Ruairí and Colgáin, Eoin Ó}, biburl = {https://www.bibsonomy.org/bibtex/25e1397222c73c80681f5ea2d7ec9473f/citekhatri}, description = {Anisotropic Hubble Expansion in Pantheon Supernovae}, interhash = {704ba15efe4bf667f9be779213b60368}, intrahash = {5e1397222c73c80681f5ea2d7ec9473f}, keywords = {tifr}, note = {cite arxiv:2304.02718Comment: 4 pages, 7 figures. Comments welcome}, timestamp = {2023-04-07T09:28:14.000+0200}, title = {Anisotropic Hubble Expansion in Pantheon+ Supernovae}, url = {http://arxiv.org/abs/2304.02718}, year = 2023 }