The quantum reform of the modern metric system

23rd May (Thursday) Dr. Bill Phillips (NIST & U. Maryland)  and 1997 Physics Nobel Laureate will be visiting us for the day and giving a colloquium at 3:30 pm  (Coffee, tea and refreshments from 3pm):

Venue: GROVE LECTURE THEATRE

Time: 3:30 pm (Coffee/tea/refreshments from 3:00 pm)

Poster of Bill Williams

Abstract

Born with the French revolution at the end of the 18th century, the metric system of units, now known as the International System of Units or SI, has undergone continual improvement.  Originally, units of measure like the metre, kilogram, second, and ampere were defined classically, often with reference to classical objects like a metre bar or a standard kilogram.  Improvements have increased not only the accuracy and precision with which we can measure physical quantities in metric units, but also the availability of the units to the international scientific and technical community.  In May of 2019, the most revolutionary change to the SI since the French revolution has given us a quantum-based measurement system in which all of the base unites of the SI are defined by fixing the values of natural constants.

ALPHA collaboration at CERN Confirms Antimatter Falls in the Same Way as Matter for the First Time

Swansea University physicists, as leading members of the ALPHA (Antihydrogen Laser Physics Apparatus) collaboration at CERN, have demonstrated that atoms of antihydrogen fall to Earth in the same way as their matter equivalents for the first time.

Published in Nature, this study's groundbreaking results rule out the possibility of antimatter being accelerated upwards in Earth's gravity and bring researchers one step closer to unravelling one of the most high-profile problems in physics.

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