Supervisory authorities

CNRS

Our partners

Search




Home > EN > In the headlines

In physics, a famous paradox is hanging on by a fiber ...

by Johanna Leclercq - published on , updated on

Abstract of the article « En physique, un célèbre paradoxe qui ne tient qu’à une fibre…/In physics, a famous paradox is hanging on by a fiber... » published by the Photonics team in The Conversation on May 2, 2018.

Imagine a heated metal bar at one end. Instead of the heat gradually spreading over its entire length, the bar would eventually become hot again at the original place. This is a physical process where a complex system returns to its original state instead of evolving towards equilibrium: the explanation of this paradox has resisted with physicists for more than sixty years. Thanks to a series of measures more detailed and complete than before made in optical fibers, our Franco-Italian team has just taken a step in the fine understanding of this phenomenon.

The publication which relates its progress (Fibre multi-wave mixing combs reveal the broken symmetry of Fermi–Pasta–Ulam recurrence), did the cover of the magazine Nature Photonics Volume 12 n°5 May 2018.
These are leanding results for physics in general but it is also interesting for the public: the process in question is at the heart of phenomena as diverse as the formation of rogue waves in the ocean or the design of high precision optical clocks.
Photo : Several recurrences of Fermi Pasta Ulam with alternation of maxima (red) and minima (light blue)


Arnaud Mussot Professor at the PhLAM Laboratory


Read also :
The article of popularization "En physique, un célèbre paradoxe qui ne tient qu’à une fibre…/In physics, a famous paradox is hanging on by a fiber..." published in The Conversation May 2, 2018: © The original version of this article was published on The Conversation All rights reserved.


The article "Fibre multi-wave mixing combs reveal the broken symmetry of Fermi–Pasta–Ulam recurrence" published in Nature Photonics volume 12 n°5 page 303 to 308 May 2018 : © 2018 Macmillan Publishers Limited, part of Springer Nature. All rights reserved.


And the editorial highlighting in "news & views" published in Nature Photonics volume 12 n°5 page 257 to 259 May 2018 : © 2018 Macmillan Publishers Limited, part of Springer Nature. All rights reserved.