Linear degenerations of flag varieties: partial flags, defining equations, and group actions
Linear degenerations of flag varieties: partial flags, defining equations, and group actions
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标志种类的线性退化:部分标志、定义方程和群动作
DOI:
10.1007/s00209-019-02451-1
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发表时间:
2019
影响因子:
0.8
通讯作者:
M. Reineke
中科院分区:
文献类型:
--
作者:
G. Cerulli Irelli;X. Fang;E. Feigin;G. Fourier;M. Reineke
We continue, generalize and expand our study of linear degenerations of flag varieties from Cerulli Irelli et al. (Math Z 287(1–2):615–654, 2017). We realize partial flag varieties as quiver Grassmannians for equi-oriented type A quivers and construct linear degenerations by varying the corresponding quiver representation. We prove that there exists the deepest flat degeneration and the deepest flat irreducible degeneration: the former is the partial analogue of the mf-degenerate flag variety and the latter coincides with the partial PBW-degenerate flag variety. We compute the generating function of the number of orbits in the flat irreducible locus and study the natural family of line bundles on the degenerations from the flat irreducible locus. We also describe explicitly the reduced scheme structure on these degenerations and conjecture that similar results hold for the whole flat locus. Finally, we prove an analogue of the Borel–Weil theorem for the flat irreducible locus.
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DOI:
10.1016/j.aim.2013.05.024
发表时间:
2012
期刊:
arXiv: Algebraic Geometry
影响因子:
--
作者:
Giovanni Cerulli Irelli;E. Feigin;M. Reineke
通讯作者:
M. Reineke
影响因子:
1.6
作者:
X. Fang;E. Feigin;G. Fourier;I. Makhlin
通讯作者:
I. Makhlin
DOI:
--
发表时间:
2015
期刊:
影响因子:
--
作者:
C. Ringel
通讯作者:
C. Ringel
DOI:
--
发表时间:
1979
期刊:
影响因子:
--
作者:
J. Riordan
通讯作者:
J. Riordan
DOI:
--
发表时间:
2014
期刊:
Journal of Combinatorial Theory
影响因子:
--
作者:
G. Fourier
通讯作者:
G. Fourier