Projective-injective splitting conjecture for extension modules

Let SGS^G be a Yang–Mills-type theory and let ı:GG^\imath:G\hookrightarrow\hat{G} be a basic extension of GG with P^\hat{P} compact. Let RR be a ring and G\mathbb{G} a group. The extension space Ext(SG;Ωeq1(P^;g^))\operatorname{Ext}(S^G;\Omega^1_{eq}(\hat{P};\hat{\mathfrak{g}})) is considered as an R[G]R[\mathbb{G}]-module, as are the spaces Ext(SG;Conn^(P^;g^))\operatorname{Ext}(S^G;\widehat{\operatorname{Conn}}(\hat{P};\hat{\mathfrak{g}})).

Splitting conjecture. There exist RR and G\mathbb{G} such that Ext(SG;Ωeq1(P^;g^))\operatorname{Ext}(S^G;\Omega^1_{eq}(\hat{P};\hat{\mathfrak{g}})) is injective as an R[G]R[\mathbb{G}]-module, every Ext(SG;Conn^(P^;g^))\operatorname{Ext}(S^G;\widehat{\operatorname{Conn}}(\hat{P};\hat{\mathfrak{g}})), except possibly the one with Conn^(P^;g^)=Ωeq1(P^;g^)\widehat{\operatorname{Conn}}(\hat{P};\hat{\mathfrak{g}})=\Omega^1_{eq}(\hat{P};\hat{\mathfrak{g}}), is projective as an R[G]R[\mathbb{G}]-module, and the induced splittings can be chosen so that the corresponding map ss is continuous in the described topologies.

These algebraic hypotheses would make the restriction map fiberwise split and yield a continuous section embedding the extension bundle as an R[G]R[\mathbb{G}]-subbundle of a trivial bundle. The source does not establish the existence of the required RR and G\mathbb{G} or the continuous choices of splittings.

Sources & referencesView supporting material

Primary source

Yuri Ximenes Martins, Luiz Felipe Andrade Campos and Rodney Josué Biezuner, “On Extensions of Yang-Mills-Type Theories, Their Spaces and Their Categories”, arXiv:2007.01660 (2020).

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