A $p$-adic Regulator Map and Finiteness Results for Arithmetic Schemes

A main theme of the paper is a conjecture of Bloch-Kato on the image of $p$-adic regulator maps for a proper smooth variety $X$ over an algebraic number field $k$. The conjecture for a regulator map of particular degree and weight is related to finiteness of two arithmetic objects: One is the $p$-primary torsion part of the Chow group in codimension $2$ of $X$. Another is an unramified cohomology group of $X$. As an application, for a regular model ${\mathscr X}$ of $X$ over the integer ring of $k$, we prove an injectivity result on the torsion cycle class map of codimension $2$ with values in a new $p$-adic cohomology of ${\mathscr X}$ introduced by the second author, which is a candidate of the conjectural étale motivic cohomology with finite coefficients of Beilinson-Lichtenbaum.

2010 Mathematics Subject Classification: Primary 14C25, 14G40; Secondary 14F30, 19F27, 11G25.

Keywords and Phrases: $p$-adic regulator, unramified cohomology, Chow groups, $p$-adic étale Tate twists

Full text: dvi.gz 117 k, dvi 323 k, ps.gz 1385 k, pdf 565 k.

Home Page of DOCUMENTA MATHEMATICA