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- W1657305498 abstract "There are two redshifts in cosmology: $z_o$, the observed redshift defined by spectral lines, and the model redshift, $z$. In general they are not the same, evoking the question of what constraints can be placed on a general relationship between the two, $z = f(z_o)$? Such a general remapping is degenerate with cosmic dynamics for either $d_L(z)$ or $H(z)$ observations alone: the simple remapping $z = alpha_1 z_o+alpha_2z_o^2$ allows an Einstein de Sitter universe to fit the observed supernova Hubble diagram as successfully as $Lambda$CDM. However redshift remapping leaves distinct observational signatures which allow us to both strongly constrain remapping and reaffirm acceleration when current $d_A, d_L$ and $H(z)$ data are combined. Remapping can significantly change the inferred values of data points, blurring the line between theory and data and creating tension between different estimates of parameters such as $H_0$. While constraining specific models with redshift remapping requires careful analysis, our results suggest it provides a powerful new test of backreaction and non-standard physics." @default.
- W1657305498 created "2016-06-24" @default.
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- W1657305498 date "2013-12-09" @default.
- W1657305498 modified "2023-09-27" @default.
- W1657305498 title "A Tale of Two Redshifts" @default.
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