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https://repository.kulib.kyoto-u.ac.jp/dspace/bitstream/2433/244783/1/B76-02.pdf
宇宙際Teichmuller理論入門(On the examination and further development of inter-universal Teichmuller theory)
星 裕一郎 Aug-2019 数理解析研究所講究録別冊 B76
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P83
§ 1. 円分物
この §1 では, その対象の輸送の遂行の際に重要な役割を果たす 円分
物 (cyclotome) という概念についての解説を行います.
円分物とは何でしょうか. それは Tate 捻り “Zb(1)” のことです. 広義には, Zb(1) の
商や, あるいは, “(Q/Z)(1)” という可除な変種も円分物と呼ばれます. 遠アーベル幾何学
において, この円分物の “管理” は非常に重要です. この点について, もう少し説明しましょう.
(引用終り)

冒頭からワカランｗ（＾＾；
Tate 捻り “Zb(1)”？ 下記かな？
https://en.wikipedia.org/wiki/Tate_twist
Tate twist
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In number theory and algebraic geometry, the Tate twist,[1] named after John Tate, is an operation on Galois modules.
For example, if K is a field, GK is its absolute Galois group, and ρ : GK → AutQp(V) is a representation of GK on a finite-dimensional vector space V over the field Qp of p-adic numbers, then the Tate twist of V, denoted V(1), is the representation on the tensor product V?Qp(1), where Qp(1) is the p-adic cyclotomic character
(i.e. the Tate module of the group of roots of unity in the separable closure Ks of K).
More generally, if m is a positive integer, the mth Tate twist of V, denoted V(m), is the tensor product of V with the m-fold tensor product of Qp(1).
Denoting by Qp(?1) the dual representation of Qp(1), the -mth Tate twist of V can be defined as
V ◯X Q_p(-1)^{◯X m}.
References
'The Tate Twist', in Lecture Notes in Mathematics', Vol 1604, 1995, Springer, Berlin p.98-102