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Torsion representations arising from $(φ,\hat{G})$-modules

The notion of a $(φ,\hat{G})$-module is defined by Tong Liu in 2010 to classify lattices in semi-stable representations. In this paper, we study torsion $(φ,\hat{G})$-modules, and torsion p-adic representations associated with them, including the case where p=2. First we prove that the category of torsion p-adic representations arising from torsion $(φ,\hat{G})$-modules is an abelian category. Secondly, we construct a maximal (minimal) theory for $(φ,\hat{G})$-modules by using the theory of étale $(φ, \hat{G})$-modules, essentially proved by Xavier Caruso, which is an analogue of Fontaine's theory of étale $(φ,Γ)$-modules. Non-isomorphic two maximal (minimal) objects give non-isomorphic two torsion p-adic representations.