On numerical equivalence for algebraic cobordism

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• 作者：Anandam Banerjee ^{anandam@mathsci.kaist.ac.kr" class="auth_mail" title="E-mail the corresponding author anandamb@gmail.com" class="auth_mail" title="E-mail the corresponding author} ; Jinhyun Park ; ^{jinhyun@mathsci.kaist.ac.kr" class="auth_mail" title="E-mail the corresponding author} ; ^{jinhyun@kaist.edu" class="auth_mail" title="E-mail the corresponding author}
• 关键词：Primary ; 14F43 ; secondary ; 55N22
• 刊名：Journal of Pure and Applied Algebra
• 出版年：2016
• 出版时间：January 2016
• 年：2016
• 卷：220
• 期：1
• 页码：435-464
• 全文大小：700 K

文摘

We define and study the notion of numerical equivalence on algebraic cobordism cycles. We prove that algebraic cobordism modulo numerical equivalence is a finitely generated module over the Lazard ring, and it reproduces the Chow group modulo numerical equivalence. We show this theory defines an oriented Borel–Moore homology theory on schemes and oriented cohomology theory on smooth varieties.

We compare it with homological equivalence and smash-equivalence for cobordism cycles. For the former, we show that homological equivalence on algebraic cobordism is strictly finer than numerical equivalence, answering negatively the integral cobordism analogue of the standard conjecture (D). For the latter, using Kimura finiteness on cobordism motives, we partially resolve the cobordism analogue of a conjecture by Voevodsky on rational smash-equivalence and numerical equivalence.