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Let $E$ be a sufficiently large finite extension of $\mathbb{Q}_p$ and $\rho_p$ be a semi-stable representation $\mathrm{Gal}(\overline{\mathbb{Q}_p}/\mathbb{Q}_p)\rightarrow\mathrm{GL}_3(E)$ with a rank two monodromy operator $N$ and a non-critical Hodge filtration. We know that $\rho_p$ has three $\mathscr{L}$-invariants. We construct a family of locally analytic representations of $\mathrm{GL}_3(\mathbb{Q}_p)$ depending on three invariants in $E$ with each of them containing the locally algebraic representation determined by $\rho_p$. When $\rho_p$ comes from an automorphic representation $\pi$ of $G(\mathbb{A}_{\mathbb{Q}_p})$ for a suitable unitary group $G_{/\mathbb{Q}}$, we show that there is a unique object in the above family that embeds into the associated Hecke-isotypic subspace in the completed cohomology. We recall that Breuil constructed a family of locally analytic representations depending on four invariants and proved a similar result of local-global compatibility. We prove that if a representation $\Pi$ in Breuil's family embeds into the completed cohomology, then it must equally embed into an object in our family determined by $\Pi$. This gives a purely representation theoretic necessary condition for $\Pi$ to embed into completed cohomology. Moreover, certain natural subquotients of each object in our family give a true complex of locally analytic representations that realizes the derived object $\Sigma(\lambda, \underline{\mathscr{L}})$ by Schraen for a unique $\underline{\mathscr{L}}$ determined by the object. Consequently, the family we construct gives a relation between the higher $\mathscr{L}$-invariants studied by Breuil and Ding and the $p$-adic dilogarithm function which appears in the construction of $\Sigma(\lambda, \underline{\mathscr{L}})$ by Schraen.

Dilogarithm and higher ℒ-invariants for 𝒢ℒ₃(𝐐_{𝐩})