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Front. Phys. | doi: 10.3389/fphy.2019.00076

GUT Physics in the era of the LHC

Djuna Croon1,  Tomas E. Gonzalo2, 3*, Lukas Graf4, 5,  Nejc Kosnik6, 7 and  Graham White1
  • 1TRIUMF, Canada
  • 2Monash University, Australia
  • 3University of Oslo, Norway
  • 4University College London, United Kingdom
  • 5Max-Planck-Institut für Kernphysik, Germany
  • 6University of Ljubljana, Slovenia
  • 7Jožef Stefan Institute (IJS), Slovenia

Grand Unified Theories (GUTs) are one of the most interesting high-energy com-
pletions of the Standard Model, because they provide a rich, powerful and elegant
group-theoretical framework able to resolve a variety of problems remaining in our
current understanding of particle physics. They usually act as motivators for many
low energy BSM theories, such as left-right symmetric or supersymmetric models,
and they serve to fill the gap between the experimentally reachable low energies and
the physics in the ultraviolet. In recent years, however, they have fallen slightly from
the spotlight, in favour of “simplified” models with more specific phenomenological
predictions. The aim of this review is to summarize the state of the art on GUTs
and argue for their importance in modern physics. Recent advances in experiments
permit to test the predictions of GUTs at different energy scales. First, as GUTs can
play a role in the inflationary dynamics of the early Universe, their imprints could be
found in the CMB observations by the Planck satellite. Remarkably enough, GUTs
could manifest themselves also in terrestrial tests; several planned experiments aim
to probe the proton stability and to establish order of magnitude higher bounds on
its lifetime. Moreover, the predictions of specific GUT models could be tested even at
the LHC thanks to its high energy reach, via searches for exotic states or additional
contributions to flavour anomalies.

Keywords: grand unified theories, supersymmetry, cosmology, flavour, Beyond the Standard Model

Received: 15 Dec 2018; Accepted: 02 May 2019.

Edited by:

António P. Morais, University of Aveiro, Portugal

Reviewed by:

Zhenbin Wu, University of Illinois at Chicago, United States
Joel W. Walker, Sam Houston State University, United States  

Copyright: © 2019 Croon, Gonzalo, Graf, Kosnik and White. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

* Correspondence: Dr. Tomas E. Gonzalo, Monash University, Melbourne, Australia,