Multiplicative preprojective algebras of Dynkin quivers
Multiplicative preprojective algebras of Dynkin quivers
复制标题
Dynkin 箭袋的乘法原射代数
DOI:
10.1016/j.jpaa.2022.107146
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发表时间:
2023
影响因子:
0.8
通讯作者:
Kaplan D
中科院分区:
文献类型:
--
作者:
Kaplan D
For a commutative ring R and an ADE Dynkin quiver Q, we prove that the multiplicative preprojective algebra of Crawley-Boevey and Shaw, with parameter q= 1, is isomorphic to the (additive) preprojective algebra as R-algebras if and only if the bad primes for Q–2 in type D, 2 and 3 for Q= E 6, E 7 and 2, 3 and 5 for Q= E 8–are invertible in R. We construct an explicit isomorphism over Z [1/2] in type D, over Z [1/2, 1/3] for Q= E 6, E 7 and over Z [1/2, 1/3, 1/5] for Q= E 8. Conversely, if some bad prime is not invertible in R, we show that the additive and multiplicative preprojective algebras differ in zeroth Hochschild homology, and hence are not isomorphic. In fact, one only needs the vanishing of certain classes in zeroth Hochschild homology of the multiplicative preprojective algebra, utilizing a rigidification argument for isomorphisms that may be of independent interest. In the setting of Ginzburg dg-algebras, our obstructions are new in type E and give a more elementary proof of the negative result of Etgü–Lekili [5, Theorem 13] in type D. Moreover, the zeroth Hochschild homology of the multiplicative preprojective algebra, computed in Section 4, can be interpreted as the space of unobstructed deformations of the multiplicative Ginzburg dg-algebra by Van den Bergh duality. Finally, we observe that the multiplicative preprojective algebra is not symmetric Frobenius if Q≠ A 1, a departure from the additive preprojective algebra in characteristic 2 for Q= D 2 n, n≥ 2 and Q= E 7, E 8.
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DOI:
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发表时间:
2015
期刊:
影响因子:
--
作者:
R. Bezrukavnikov;M. Kapranov
通讯作者:
M. Kapranov
DOI:
10.2140/ant.2023.17.831
发表时间:
2019
期刊:
Algebra & Number Theory
影响因子:
--
作者:
Daniel Kaplan;T. Schedler
通讯作者:
T. Schedler
DOI:
--
发表时间:
2004
期刊:
影响因子:
--
作者:
W. Crawley;P. Shaw
通讯作者:
P. Shaw
DOI:
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发表时间:
2007
期刊:
影响因子:
--
作者:
T. Schedler
通讯作者:
T. Schedler
DOI:
--
发表时间:
2011
期刊:
影响因子:
--
作者:
W. Crawley
通讯作者:
W. Crawley