Wigderson–Wigderson conjecture on the range of Fourier norm ratios

About 5 years old · traced to

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 f∈S(R)f\in\mathcal{S}(\mathbb{R}) and q∈(1,∞]q\in(1,\infty], define

Fq(f)=∥f∥q∥f^∥q∥f∥2∥f^∥2=∥f∥q∥f^∥q∥f∥22.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 q≠2q\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 q≠2q\neq 2. The supplied source does not state whether the conjecture has been resolved.

References

Primary source

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

Progress summary

Never refreshed

Nothing recorded yet. Refresh searches the literature and the public web for attempts on this problem, and writes the first summary here.

Solutions 0

No solutions have been posted yet.