Sir Thomas Walter Bannerman Kibble CBE

TL;DR

Professor Tom Kibble's pioneering work on gauge theories and symmetry breaking laid the theoretical foundation for the Higgs mechanism, crucial to the Standard Model and confirmed by the discovery of the Higgs boson in 2012.

Contribution

Kibble generalized the symmetry-breaking mechanism in non-abelian gauge theories, advancing the theoretical understanding of mass generation for force-carrying particles.

Findings

Development of the symmetry-breaking mechanism in gauge theories

Prediction of the Higgs boson as a scalar particle

Foundational role in the Standard Model

Abstract

Professor Tom Kibble was an internationally-renowned theoretical physicist whose contributions to theoretical physics range from the theory of elementary particles to modern early-universe cosmology. The unifying theme behind all his work is the theory of non-abelian gauge theories, the Yang-Mills extension of electromagnetism. One of Kibble's most important pieces of work in this area was his study of the symmetry-breaking mechanism whereby the force-carrying vector particles in the theory can acquire a mass accompanied by the appearance of a massive scalar boson. This idea, put forward independently by Brout and Englert, by Higgs and by Guralnik, Hagen and Kibble in 1964, and generalised by Kibble in 1967, lies at the heart of the Standard Model and all modern unified theories of fundamental particles. It was vindicated in 2012 by the discovery of the Higgs boson at CERN. According to Nobel Laureate Steven Weinberg, "Tom Kibble showed us why light is massless"; this is the fundamental basis of electromagnetism.