Twisted quadratic Kloosterman-sum bound with additive twists

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Let a,q≥2a,q\geq2 be integers with (a,q)=1(a,q)=1 and qq not a perfect square. Let H,K≥1H,K\geq1 and λ,μ\lambda,\mu be reals. Define e(u):=e2πiue(u):=e^{2\pi i u}, let (⋅⋅)\left(\frac{\cdot}{\cdot}\right) denote the Jacobi symbol, and let hˉ\bar h denote the multiplicative inverse of hh modulo qq. Twisted quadratic Kloosterman-sum bound with additive twists. For any ϵ>0\epsilon>0,

∑1≤h≤H(h,q)=1e(λh)∑0≤k<Ke(μk)(hq)e(ahˉk2q)≪ϵ(H1/2K1/2+H3/4+K+q−1/2HK+q−1/2K2)qϵ.\begin{aligned} &\mathop{\sum_{1\leq h\leq H}}_{(h,q)=1}e(\lambda h)\sum_{0\leq k<K}e(\mu k)\left(\frac{h}{q}\right)e\left(\frac{a\bar h k^2}{q}\right)\\ &\ll_\epsilon\left(H^{1/2}K^{1/2}+H^{3/4}+K+q^{-1/2}HK+q^{-1/2}K^2\right)q^\epsilon. \end{aligned}

This is proposed as the stronger estimate needed when the phase has additive twists; the source gives no resolution evidence.

References

Primary source

Tsz Ho Chan, “Finding Almost Squares”, arXiv:math/0502199 (2005).

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