Wigderson–Wigderson conjecture on the range of Fourier norm ratios

Let S(R)\mathcal{S}(\mathbb{R}) be the space of Schwartz functions, and let f^\hat f denote the Fourier transform of ff. For a non-zero fS(R)f\in\mathcal{S}(\mathbb{R}) and q(1,]q\in(1,\infty], define

Fq(f)=fqf^qf2f^2=fqf^qf22.F_q(f)=\frac{\|f\|_q\|\hat f\|_q}{\|f\|_2\|\hat f\|_2}=\frac{\|f\|_q\|\hat f\|_q}{\|f\|_2^2}.

Wigderson–Wigderson conjecture. For all q2q\neq 2, the image of

Fq:S(R){0}R>0F_q:\mathcal{S}(\mathbb{R})\setminus\{0\}\to\mathbb{R}_{>0}

is R>0\mathbb{R}_{>0}.

This conjecture asks whether the norm ratio arising in the generalized Heisenberg uncertainty principle can attain every positive real value when q2q\neq 2. The supplied source does not state whether the conjecture has been resolved.

Sources & referencesView supporting material

Primary source

Linzhe Huang, Zhengwei Liu and Jinsong Wu, “Quantum smooth uncertainty principles for von Neumann bi-algebras”, arXiv:2107.09057 (2021).

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