The motivic Lie algebra of mixed Tate motives over Z is shown to embed canonically into unstable compactly-supported cohomology of GL_g(Z)-locally symmetric spaces and of A_g, via canonical graph cocycles that are generators of g_m.
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The motivic Lie algebra embeds into the cohomology of the general linear group
The motivic Lie algebra of mixed Tate motives over Z is shown to embed canonically into unstable compactly-supported cohomology of GL_g(Z)-locally symmetric spaces and of A_g, via canonical graph cocycles that are generators of g_m.