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Let $K$ be a complete discrete valuation field of mixed characteristic$(0,p)$ with residue field $k_K$ such that $[k_K:k_K^p]=p^d<\infty$. Let $G_K$be the absolute Galois group of $K$ and $\rho:G_K\to GL_h(\Q_p)$ a $p$-adicrepresentation. When $k_K$ is perfect, Shankar Sen described the Lie algebra of$\rho(G_K)$ in terms of so-called Sen's operator $\Theta$ for $\rho$. When$k_K$ may not be perfect, Olivier Brinon defined $d+1$ operators$\Theta_0,...,\Theta_d$ for $\rho$, which coincides with Sen's operator$\Theta$ in the case of $d=0$. In this paper, we describe the Lie algebra of$\rho(G_K)$ in terms of Brinon's operators $\Theta_0,...,\Theta_d$, which is ageneralization of Sen's result.

On Lie algebras arising from $p$-adic representations in the imperfect residue field case