p -adic Entropy and a p -adic Fuglede–Kadison Determinant
p -adic Entropy and a p -adic Fuglede–Kadison Determinant
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p 进熵和 p 进 Fuglede–Kadison 行列式
DOI:
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发表时间:
2006
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通讯作者:
C. Deninger
中科院分区:
文献类型:
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作者:
C. Deninger
Using periodic points, we study a notion of entropy with values in the p-adic numbers. This is done for actions of countable discrete residually finite groups (Gamma). For suitable (Gamma = mathbb{Z}^d)-actions we obtain p-adic analogues of multivariable Mahler measures. For certain actions of more general groups, the p-adic entropy can be expressed in terms of a p-adic analogue of the Fuglede–Kadison determinant from the theory of von Neumann algebras. Many basic questions remain open.