Tropical geometry and the motivic nearby fiber
E Katz, A Stapledon - Compositio Mathematica, 2012 - cambridge.org
E Katz, A Stapledon
Compositio Mathematica, 2012•cambridge.orgWe construct motivic invariants of a subvariety of an algebraic torus from its tropicalization
and initial degenerations. More specifically, we introduce an invariant of a compactification
of such a variety called the 'tropical motivic nearby fiber'. This invariant specializes in the
schön case to the Hodge–Deligne polynomial of the limit mixed Hodge structure of a
corresponding degeneration. We give purely combinatorial expressions for this Hodge–
Deligne polynomial in the cases of schön hypersurfaces and matroidal tropical varieties. We …
and initial degenerations. More specifically, we introduce an invariant of a compactification
of such a variety called the 'tropical motivic nearby fiber'. This invariant specializes in the
schön case to the Hodge–Deligne polynomial of the limit mixed Hodge structure of a
corresponding degeneration. We give purely combinatorial expressions for this Hodge–
Deligne polynomial in the cases of schön hypersurfaces and matroidal tropical varieties. We …
We construct motivic invariants of a subvariety of an algebraic torus from its tropicalization and initial degenerations. More specifically, we introduce an invariant of a compactification of such a variety called the ‘tropical motivic nearby fiber’. This invariant specializes in the schön case to the Hodge–Deligne polynomial of the limit mixed Hodge structure of a corresponding degeneration. We give purely combinatorial expressions for this Hodge–Deligne polynomial in the cases of schön hypersurfaces and matroidal tropical varieties. We also deduce a formula for the Euler characteristic of a general fiber of the degeneration.
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