Why is zero spatial curvature special?

نویسندگان

چکیده

Abstract Evidence for almost spatial flatness of the Universe has been provided from several observational probes, including Cosmic Microwave Background (CMB) and Baryon Acoustic Oscillations (BAO) galaxy clustering data. However, other than inflation, in this case only limit infinite time, there is no strong a priori motivation spatially flat Universe. Using renormalization group (RG) technique curved spacetime, we present work theoretical flatness. Starting general first step RG, coarse-graining, gives Friedmann-Lemaître-Robertson-Walker (FLRW) metric with set parameters. Then, study rescaling properties curvature parameter, find that zero FLRW singled out as unique scale-free, non-singular background cosmological perturbations.

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ژورنال

عنوان ژورنال: Journal of Cosmology and Astroparticle Physics

سال: 2023

ISSN: ['1475-7516', '1475-7508']

DOI: https://doi.org/10.1088/1475-7516/2023/09/007