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BIPM Symposium: The Fundamental Constants of Physics

What are they and what is their role in redefining the SI?


7 September 2017 (at the BIPM)


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Martin Milton

Director of the BIPM

Joachim Ullrich

President of the CCU

Executive Secretary

Estefanía de Mirandés


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This symposium was organized by the Consultative Committee for Units (CCU) to celebrate the work accomplished towards a redefinition of the SI in terms of invariant physical constants.

The main topics of the discussion were: the profound nature of the different fundamental physical constants; the different types of fundamental constants as well as their role in the evolution of physical theory, in particular in gravitation, cosmology and in string theory. In particular, the role of the fundamental constants in the forthcoming definition of the SI was examined.

The Symposium aimed to promote scientific exchange amongst the National Metrology Institutes and leading scientists in the field of fundamental constants.


Workshop documents


Variations on the Planck constant

Jean-Marc Lévy-Leblond


Fundamental constants, gravitation and cosmology

Jean Philippe Uzan


Lambda, the fifth foundational constant

Gilles Cohen-Tannoudji


Fundamental strings and fundamental constants

Gabriele Veneziano

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See also

See also:

fundamental constants METROLOGIA

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