PBW filtration and bases for symplectic Lie algebras
PBW filtration and bases for symplectic Lie algebras
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DOI:
10.1093/imrn/rnr014
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发表时间:
2010-10
期刊:
影响因子:
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通讯作者:
E. Feigin;G. Fourier;P. Littelmann
中科院分区:
文献类型:
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作者:
E. Feigin;G. Fourier;P. Littelmann
We study the PBW filtration on the highest weight representations $V(\la)$ of $\msp_{2n}$. This filtration is induced by the standard degree filtration on $U(\n^-)$. We give a description of the associated graded $S(\n^-)$-module $gr V(\la)$ in terms of generators and relations. We also construct a basis of $gr V(\la)$. As an application we derive a graded combinatorial formula for the character of $V(\la)$ and obtain a new class of bases of the modules $V(\la)$.