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The values of Mahler measures

Part of: Algebraic number theory: global fields

Published online by Cambridge University Press:  26 February 2010

John D. Dixon  and
Artūras Dubickas
John D. Dixon
Affiliation:
School of Mathematics and Statistics, Carleton University, Ottawa ON K1S 5B6, Canada. E-mail: [email protected]
Artūras Dubickas
Affiliation:
Department of Mathematics and Informatics, Vilnius University, Naugarduko 24, Vilnius 2600, Lithuania. E-mail: [email protected]
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Abstract

The set ℳ* of numbers which occur as Mahler measures of integer polynomials and the subset ℳ of Mahler measures of algebraic numbers (that is, of irreducible integer polynomials) are investigated. It is proved that every number α of degree d in ℳ* is the Mahler measure of a separable integer polynomial of degree at most with all its roots lying in the Galois closure F of ℚ(α), and every unit in ℳ is the Mahler measure of a unit in F of degree at most over ℚ This is used to show that some numbers considered earlier by Boyd are not Mahler measures. The set of numbers which occur as Mahler measures of both reciprocal and nonreciprocal algebraic numbers is also investigated. In particular, all cubic units in this set are described and it is shown that the smallest Pisot number is not the measure of a reciprocal number.

MSC classification

Secondary: 11R06: PV-numbers and generalizations; other special algebraic numbers; Mahler measure
Type
Research Article
Information
Mathematika , Volume 51 , Issue 1-2 , December 2004 , pp. 131 - 148
Copyright
Copyright © University College London 2004

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