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The Emperor's New Arc: gigaparsec patterns abound in a $\Lambda$CDM universe
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abstract
Recent discoveries of apparent large-scale features in the structure of the universe, extending over many hundreds of megaparsecs, have been claimed to contradict the large-scale isotropy and homogeneity foundational to the standard ($\Lambda$CDM) cosmological model. We explicitly test and refute this conjecture using FLAMINGO-10K, a new and very large cosmological simulation of the growth of structure in a $\Lambda$CDM context. Applying the same methods used in the observations, we show that patterns like the "Giant Arc", supposedly in tension with the standard model, are, in fact, common and expected in a $\Lambda$CDM universe. We also show that their reported significant overdensities are an algorithmic artefact and unlikely to reflect any underlying structure.
Forward citations
Cited by 2 Pith papers
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Optical depth to reionization in a Universe with multiple inhomogeneous domains
Backreaction from multi-domain inhomogeneities, constrained by PantheonPlus+SH0ES, produces τ_reion = 0.0581^{+0.0105}_{-0.0096} and a modest reduction of the Hubble tension.
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Constraining the Hubble parameter with the 21 cm brightness temperature signal in a universe with inhomogeneities
In a Buchert-averaged two-domain model, the 21 cm absorption trough is roughly 40 mK deeper for H0=67 than for H0=73, a difference absent in the paper's ΛCDM comparison.
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