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Observations of the missing baryons in the warm-hot intergalactic medium

Piro, L.; Shull, J. M.; Fiore, F. +18 more

It has been known for decades that the observed number of baryons in the local Universe falls about 30-40 per cent short^1,2 of the total number of baryons predicted³ by Big Bang nucleosynthesis, as inferred^4,5 from density fluctuations of the cosmic microwave background and seen during the first 2-3 billion years o…