 Title:
Affine normal
SL(2)embeddings and flips  Speaker : Yoonsuk Hyun(KIAS)

Date & Time : April 13 (Fri)
, 2012 14:00~ 15:00
 Place : Math Science building room 404

Abstract :
In this talk, I will talk about the
properties and the classification of embeddings of homogeneous spaces,
especially the case of affine normal embeddings of reductive groups. We might
guess that as in the case of toric varieties, some specific subset of oneparameter
subgroups may contribute to the classification of affine embeddings of general
reductive group.
To check this, we review the theory of affine normal SL(2)embeddings, and prove that the classification cannot be solved entirely based on oneparameter subgroups. Also, I will also give examples of GL(2)embeddings which had not previously been constructed in detail, which might be helpful in understanding the general classification of affine normal Gembeddings.
One interesting properties of SL(2)embeddings and GL(2)embeddings are that they are Mori dream spaces with some general conditions. If time permitted, I will review how to describe the geometry of SL(2)equivariant flips, and try to do the same thing for GL(2)equivariant flips.

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