Average spatial curvature contributes about 10% to the local cosmic energy budget on scales up to 300 Mpc/h while kinematical backreaction stays below 1% on the smallest scales, with no convergence to the global Lambda-CDM model.
First observational constraints on cosmic backreaction over an extended redshift range
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In the recent preprint arXiv:2604.07244v1, the authors introduce a novel combination of redshift, distance, and expansion rate observables for constraining cosmic backreaction. The current work presents a first application of the method, yielding the first direct constraints on the total cosmic backreaction in our Universe over a significant redshift range. The constraints are consistent with vanishing backreaction within one standard deviation. However, the constraints are fairly weak and significant backreaction cannot be ruled out.
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Backreaction and the Role of Spatial Curvature in the Cosmic Neighborhood
Average spatial curvature contributes about 10% to the local cosmic energy budget on scales up to 300 Mpc/h while kinematical backreaction stays below 1% on the smallest scales, with no convergence to the global Lambda-CDM model.