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Machine learning cosmic backreaction and its effects on observations

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arxiv 2305.01224 v2 pith:X6WRELN5 submitted 2023-05-02 astro-ph.CO

classification astro-ph.CO
keywords backreactioncosmicdriftexpressionsredshiftsymboliceffectsobservations
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Symbolic expressions for cosmic backreaction and mean redshift drift in a range of 2-region models in terms of average quantities are presented. The demonstration that these expressions can be obtained constitutes the opening of a new avenue towards understanding the effects of cosmic backreaction in our universe: With a symbolic expression for the redshift drift at hand, the redshift drift can be used to constrain cosmological parameters including the large-scale expansion rate and backreaction. In addition, by introducing symbolic expressions for cosmic backreaction, this quantity can be constrained with observations such as redshift-distance measures.

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Cited by 1 Pith paper

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  1. Machine Learning-Based Analytical Expressions for Gray-Body Factors and Application to Primordial Black Holes

    astro-ph.CO 2025-04 conditional novelty 6.0 of 10

    Symbolic regression is used to derive compact error-function approximations for Schwarzschild gray-body factors, and the approximations reproduce the Hawking spectra and primordial black hole constraints from full num...

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