Let 𝔽 be a finite field.
We prove that the cohomology algebra with coefficients in 𝔽 of a right-angled Artin group is a strongly Koszul algebra for every finite graph Γ.
Moreover, is a universally Koszul algebra if, and only if, the graph Γ associated to the group has the diagonal property.
From this, we obtain several new examples of pro-𝑝 groups, for a prime number 𝑝, whose continuous cochain cohomology algebra with coefficients in the field of 𝑝 elements is strongly and universally (or strongly and non-universally) Koszul.
This provides new support to a conjecture on Galois cohomology of maximal pro-𝑝 Galois groups of fields formulated by J. Mináč et al.
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