Lower bound conjecture for generalised divisor sums

From papers

Let KK be a number field, fix an ideal class representative uIK u\in\mathcal{I}_K, let fZKf\in\mathcal{Z}_K, and let F\mathfrak{F} be a system of binary forms as in the paper. For an F\mathfrak{F}-admissible triplet P=(D,(σ,τ),W)\mathcal{P}=(\mathcal{D},(\sigma,\tau),\mathfrak{W}), let D(F,f,P;X)D(\mathfrak{F},f,\mathcal{P};X) denote the associated generalised divisor \sum, and let ρ(F)\rho(\mathfrak{F}) be the exponent defined for the system of forms. Lower bound conjecture for generalised divisor sums. There \exists a finite set Sbad=Sbad(F,f,ν)S_{\mathrm{bad}}=S_{\mathrm{bad}}(\mathfrak{F},f,\nu) of \prime ideals of OK\mathcal{O}_K such that, whenever P\mathcal{P} is F\mathfrak{F}-admissible and W\mathfrak{W} is divisible by every pSbad\mathfrak{p}\in S_{\mathrm{bad}}, one has

D(F,f,P;X)X2(logX)ρ(F)as X.D(\mathfrak{F},f,\mathcal{P};X)\ggg X^2(\log X)^{\rho(\mathfrak{F})}\quad\text{as }X\to\infty.

The implicit constant may depend on every parameter except XX. The claim is presented as a lower-bound prediction for these generalised divisor sums; the surrounding discussion notes that its special case for constant GiG_i over Q\mathbb{Q} is familiar, but says that the result had not appeared in print. Its resolution is not specified in the supplied text.

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Sources & referencesView supporting material

Primary source

Christopher Frei and Efthymios Sofos, “Generalised divisor sums of binary forms over number fields”, arXiv:1609.04002 (2016).

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