Mahler's Measure and the Dilogarithm (II)

Details Mahler's Measure and the Dilogarithm (II) Mahler's Measure and the Dilogarithm (II)

2003-08-05

arxiv.org/abs/math/0308041v2

Mathematics

Number Theory

37 pages. Main text by Boyd and Rodriguez-Villegas; appendix by Dunfield. V2: Improved exposition

Scientific paper

We continue to investigate the relation between the Mahler measure of certain two variable polynomials, the values of the Bloch--Wigner dilogarithm $D(z)$ and the values $\zeta_F(2)$ of zeta functions of number fields. Specifically, we define a class $\A$ of polynomials $A$ with the property that $\pi m(A)$ is a linear combination of values $D$ at algebraic arguments. For many polynomials in this class the corresponding argument of $D$ is in the Bloch group, which leads to formulas expressing $\pi m(A)$ as a linear combination with unspecified rational coefficients of $V_F$ for certain number fields $F$ ($V_F := c_F\zeta_F(2)$ with $c_F>0$ an explicit simple constant). The class $\A$ contains the $A$-polynomials of cusped hyperbolic manifolds. The connection with hyperbolic geometry often provides means to prove identities of the form $\pi m(A)= r V_F$ with an explicit value of $r\in \Q^*$. We give one such example in detail in the body of the paper and in the appendix.

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