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2015

Local gravitational redshifts can bias cosmological measurements

Wojtak, Radoslaw, Davis, Tamara M., Wiis, Jophiel

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Measurements of cosmological parameters via the distance-redshift relation usually rely on models that assume a homogenous universe.

It is commonly presumed that the large-scale structure evident in our Universe has a negligible impact on the measurement if distances probed in observations are sufficiently large (compared to the scale of inhomogeneities) and are averaged over different directions on the sky.
This presumption does not hold when considering the effect of the gravitational redshift caused by our local gravitational potential, which alters light coming from all distances and directions in the same way.
Despite its small magnitude, this local gravitational redshift gives rise to noticeable effects in cosmological inference using SN Ia data.

Local gravitational redshifts can bias cosmological measurements · Around

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