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Deligne cohomology has a geometric interpretation. For example, $H^{2}_{\mathcal{D}}(X,\mathbb{Z}(1))$ is identified with the group $H^{1}(X,\mathcal{O}_{X}^{\ast})$ of isomorphism classes of line bundles on $X$, and $H^{2}_{\mathcal{D}}(X,\mathbb{Z}(2))$ is identified with the group $\mathbb{H}^{1}(X,\mathcal{O}_{X}^{\ast}\xrightarrow{d\log}\Omega^{1}_{X})$ of isomorphism classes of line bundles on $X$ with connection. For the general case see [Gaj97] where the description is in terms of iterated classifying spaces.

Syntomic cohomology is a $p$-adic analogue of Deligne cohomology. Does it have a geometric interpretation along similar lines?

[Gaj97] P. Gajer, Geometry of Deligne cohomology, Invent. Math. 127 (1997), no.1, 155-207.

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  • $\begingroup$ I'm not an expert but this may help you. As far as I know, when we say that syntomic cohomology is a p-adic analogue of Deligne cohomology, we are saying (at least in particular) that syntomic cohomology and p-adic Abel-Jacoby share the same relations as we can observe between the Deligne cohomology and the Abel-Jacoby map. $\endgroup$ Commented Feb 1 at 14:45
  • $\begingroup$ This is something I've read in the introduction of this paper webusers.imj-prg.fr/~jan.nekovar/pu/syn.pdf $\endgroup$ Commented Feb 1 at 14:46
  • $\begingroup$ @MarsaultChabat Certainly. Indeed there are many reasons to say that syntomic cohomology is a $p$-adic analogue of Deligne cohomology. But that is not my question. $\endgroup$ Commented Feb 1 at 20:19
  • $\begingroup$ Note that I was purposefully rather vague in my question. For example, I didn't specify which "flavour" of syntomic cohomology I mean. I would guess that Besser's rigid syntomic approach might be most likely to have a description somewhat similar to the interpretations of Deligne cohomology in my question, but I don't know. $\endgroup$ Commented Feb 1 at 20:23

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