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Torsion order of smooth projective surfaces
To a smooth projective variety whose Chow group of -cycles is -universally trivial one can associate its torsion index ,
the smallest multiple of the diagonal appearing in a cycle-theoretic
decomposition \`a la Bloch-Srinivas. We show that is the
exponent of the torsion in the N\'eron-Severi-group of when is a
surface over an algebraically closed field , up to a power of the
exponential characteristic of .Comment: A few more minor changes in Colliot-Th\'el\`ene's appendi
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