Savannah Guthrie Shares Tearful Video to Mom Nancy’s Possible Captors

On February 4th, Today show host Savannah Guthrie, along with her siblings Camron and Annie Guthrie, released a sad video message. They were sharing news about their mother, Nancy Guthrie, 84, who had been missing since February 1st from her home in Arizona.





![Electron-mediated nuclear spin-spin interactions induce a decoherence time [latex]T_2[/latex] that is demonstrably sensitive to the electronic correlation length ξ, with calculations-using parameters including a flip angle of 75° and a dissipation parameter set to zero-showing [latex]T_2 \approx 145\,\rm{s}[/latex] for [latex]\xi = 2.5\rm{a}[/latex], a value corroborated by experimental measurements in YBa2Cu3O7-δ and aligning with prior theoretical work, as evidenced by simulations performed on a 200x200 lattice of 40,000 spins.](https://arxiv.org/html/2602.02732v1/x9.png)

