[geometry-ml:02024] Seminar at Kavli IPMU on 2014 April 15

[Satoshi Kondo]

Dear colleagues:

There will be a seminar as follows at Kavli IPMU
(Kavli Institute for the Physics and Mathematics of
the Universe).

Regards,

Satoshi Kondo (Kavli IPMU)
http://www.ipmu.jp/
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Speaker:Jihun Park (Postech)

Title:Cylinders in smooth del Pezzo surfaces

Date:Tue, Apr 15, 2014, 10:30 - 12:00

Place:Seminar Room A

Abstract:An anticanonical cylinder on a del Pezzo surface S is the
complement of the support of an effective Q-divisor D such that is
Q-linearly equivalent to -K_S and S-Supp(D) is isomorphic to A^1 x Z
for some affine variety Z. In this talk, it will be shown that a
smooth del Pezzo surface of low degree (especially, a smooth cubic
surface) cannot have any anticanonical cylinder. This implies that the
affine cone over a smooth cubic surface cannot admit a non-trivial
G_a-action.

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The schedule of the seminar can be checked from
http://db.ipmu.jp/seminar/