Constantin, Florin Lucian

Fourier-transform microwave spectroscopy of a transition of 12C2H2 with enhanced sensitivity to the proton-electron mass ratio (µ) variation may constrain a fractional variation of µ at the 10^(-12) level in 1 s.

de Courtenay, Nadine

Abstract The philosophical significance attached to the construction of systems of units has traditionally been confined to the notion of convention, while their adoption was considered to be the exclusive province of the history and sociology of science. Against this tradition, a close articulation between history, philosophy, and sociology of sci...

Haug, Espen Gaarder

This is a short note to show how big G can be derived from dimensional analysis by assuming that the Planck length [1] is much more fundamental than Newton's gravitational constant.

Maleval, Francis

A mirror built here, by virtue of an iterative process, a geometry from a conceptual object. This dynamic, served by the Noether’s theorem, generates the universal constants.

Fedi, Marco

It is assumed that dark energy (68.3% of what constitutes our Universe) is quantized and behaves as a superfluid. We hypothesize that the flux described in Gauss's law for gravity is real and corresponds to dark energy absorption into massive particles. Due to absorption, a quantum potential arises from the pressure gradient around any massive body...

Mejri, S. Sow, Papa Kozlova, O. Ayari, C. Tokunaga, Sean Chardonnet, C. Briaudeau, S. Darquié, B. Rohart, F. Daussy, C.
...

We report on our ongoing effort to measure the Boltzmann constant, $k_B,$ using the Doppler broadening technique on ammonia. This paper presents some of the improvements made to the mid-infrared spectrometer including the use of a phase-stabilized quantum cascade laser, a lineshape analysis based on a refined physical model and an improved fitting ...

Pavese, Franco
Published in
Accreditation and Quality Assurance

The International System of Units (SI) was first adopted in 1960, as the more recent implementation of the Metre Treaty signed in 1875. Basic features of the original SI are that (a) seven units are chosen as “base units”, all the others being “derived units”, and (b) the definitions of the base units should not create interdependence. This way, th...

Sherbon, Michael

Arnold Sommerfeld introduced the fine-structure constant that determines the strength of the electromagnetic interaction. Following Sommerfeld, Wolfgang Pauli left several clues to calculating the fine-structure constant with his research on Johannes Kepler's view of nature and Pythagorean geometry. The Laplace limit of Kepler's equation in classic...

Kajita, Masatoshi Gopakumar, Geetha Abe, Minori Hada, Masahiko
Published in
Journal of Molecular Spectroscopy

Truppe, S. Hendricks, R. J. Hinds, E. A. Tarbutt, M. R.

The CH radical offers a sensitive way to test the hypothesis that fundamental constants measured on earth may differ from those observed in other parts of the universe. The starting point for such a comparison is to have accurate laboratory frequencies. Here we measure the frequency of the lowest millimetre-wave transition of CH, near 535 GHz, with...