Cosmology

Curvature with interacting dark energy

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Science  26 Mar 2021:
Vol. 371, Issue 6536, pp. 1329-1330
DOI: 10.1126/science.371.6536.1329-e

Some analyses of the cosmic microwave background (CMB) imply that the Universe probably has a closed geometry (positive curvature). This disagrees with several other cosmological observations indicating a flat (zero curvature) Universe. Di Valentino et al. investigated whether this discrepancy can be alleviated in cosmologies that allow dark energy to interact with dark matter. They found that these more general models strengthen the arguments for a closed Universe and lessen the tension with the large-scale galaxy distribution. However, the authors caution that the discrepancy in the Hubble constant becomes worse, and that a flat Universe cannot be ruled out.

Mon. Not. R. Astron. Soc. 502, L23 (2021).

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