Boyd's conductor 30 Mahler measure conjectures

Let F(b,c)F(b,c) denote the lattice sums used in the paper, and let m(α)m(\alpha) and g(α)g(\alpha) be the Mahler measures defined by

m(α)=0101logy+y1+z+z1+αdθ1dθ2,m(\alpha)=\int_0^1\int_0^1\log\left|y+y^{-1}+z+z^{-1}+\alpha\right|\,\mathrm d\theta_1\,\mathrm d\theta_2,

and

g(α)=0101log(y+1)(z+1)(y+z)αyzdθ1dθ2,g(\alpha)=\int_0^1\int_0^1\log\left|(y+1)(z+1)(y+z)-\alpha yz\right|\,\mathrm d\theta_1\,\mathrm d\theta_2,

where y=e2πiθ1y=e^{2\pi i\theta_1} and z=e2πiθ2z=e^{2\pi i\theta_2}. Boyd's conductor 30 Mahler measure conjectures. The following formulas are numerically true:

154π2F(2,15)=3m(1)g(3),\frac{15}{4\pi^2}F(2,15)=3m(1)-g(3), 15π2F(2,53)=3m(1)+g(3).\frac{15}{\pi^2}F\left(2,\frac{5}{3}\right)=3m(1)+g(3).

These formulas arise from an unproven conjectural relation between the conductor 3030 elliptic curve and g(3)g(3), together with a modular-equation relation among the lattice sums. The source provides numerical evidence but no proof or resolution.

Sources & referencesView supporting material

Primary source

Mathew Rogers and Boonrod Yuttanan, “Modular equations and lattice sums”, arXiv:1001.4496 (2011).

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