Higher Direct Images of Log Canonical Divisors and Positivity Theorems
نویسنده
چکیده
In this paper, we investigate higher direct images of log canonical divisors. After we reformulate Koll ar's torsion-free theorem, we treat the relationship between higher direct images of log canonical divisors and the canonical extensions of Hodge ltration of gradedly polarized variations of mixed Hodge structures. As a corollary, we obtain a logarithmic version of Fujita-Kawamata's semi-positivity theorem. By this semi-positivity theorem, we generalize Kawamata's positivity theorem and apply it to the study of a log canonical bundle formula. The nal section is an appendix, which is a result of Morihiko Saito.
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