# s-gst: concerning a FPUT problem

<< In physics, the Fermi-Pasta-Ulam-Tsingou (FPUT) problem—which found that certain nonlinear systems do not disperse their energy, but rather return to their initial excited states—has been a challenge that scientists have tackled repeatedly since 1955. >>

Grove  Potter. Study unravels  long-held Fermi puzzle tied to nonlinear  systems. Apr. 14,  2017.

https://m.phys.org/news/2017-04-unravels-long-held-fermi-puzzle-tied.html

<< As  a  by-product,  we  show how  fluctuations  of  system  quantities,  and  thus  the  distribution  functions,  are influenced  by  the  Hertz  potential.  In  particular,  the  variance  of  the  system's  kinetic energy  probability  density  function  is  reduced  by  a  factor  related  to  the  contact potential >>

Michelle Przedborski, Surajit Sen, and Thad A. Harroun. Fluctuations in Hertz chains at equilibrium. Phys. Rev. E 95, 032903 doi: 10.1103/PhysRevE.95.032903  Publ. 6 March 2017

https://journals.aps.org/pre/abstract/10.1103/PhysRevE.95.032903