The Hasse principle for lines on cubic surfaces
Daniel Loughran (Hannover)
What 


When 
Sep 30, 2014 from 02:15 pm to 03:45 pm 
Where  Mainz, 04432 
Contact Name  Ariyan Javanpeykar 
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The classical Hasse principle states that a quadratic form over the rational numbers represents zero rationally if and only if it represents zero over every completion of the rational numbers.
In this talk we address the following problem: does there exist a cubic surface over the field of rational numbers which contains no rational line, yet contains a line over every completion of the rational numbers? That is, does a Hasse type principle hold for the collection of lines on a cubic surface?
In the talk we shall explain, amongst other things, how one can translate this into a problem in graph theory which can be tackled using a computer.
This is joint work with Joerg Jahnel.