TY - JOUR
T1 - Abelian fibrations and rational points on symmetric products
AU - Hassett, Brendan
AU - Tschinkel, Yuri
PY - 2000/12
Y1 - 2000/12
N2 - Given a variety over a number field, are its rational points potentially dense, i.e. does there exist a finite extension over which rational points are Zariski dense? We study the question of potential density for symmetric products of surfaces. Contrary to the situation for curves, rational points are not necessarily potentially dense on a sufficiently high symmetric product. Our main result is that rational points are potentially dense for the Nth symmetric product of a K3 surface, where N is explicitly determined by the geometry of the surface. The basic construction is that for some N, the Nth symmetric power of a K3 surface is birational to an Abelian fibration over ℙN. It is an interesting geometric problem to find the smallest N with this property.
AB - Given a variety over a number field, are its rational points potentially dense, i.e. does there exist a finite extension over which rational points are Zariski dense? We study the question of potential density for symmetric products of surfaces. Contrary to the situation for curves, rational points are not necessarily potentially dense on a sufficiently high symmetric product. Our main result is that rational points are potentially dense for the Nth symmetric product of a K3 surface, where N is explicitly determined by the geometry of the surface. The basic construction is that for some N, the Nth symmetric power of a K3 surface is birational to an Abelian fibration over ℙN. It is an interesting geometric problem to find the smallest N with this property.
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U2 - 10.1142/S0129167X00000544
DO - 10.1142/S0129167X00000544
M3 - Article
AN - SCOPUS:0034349741
SN - 0129-167X
VL - 11
SP - 1163
EP - 1176
JO - International Journal of Mathematics
JF - International Journal of Mathematics
IS - 9
ER -