Poster P2: Beyond the Standard Model with Low-energy Effective field theories


Dr. Eric Howard, Macquarie University


Despite the great predictive power and recent successes of the Standard Model, strong theoretical and observational reasons lead to a larger picture that should explain the nature of fundamental interactions, including gravity. Low-energy tests of fundamental symmetries and interactions as well as studies of particle properties provide a powerful window on the physics beyond the Standard Model. We discuss the current theoretical shortcomings and limitations of the Standard Model, that significantly impact the search for new physics at the frontier of precision physics. As the model fails answering important fundamental questions, such as including gravity in a consistent theory, a low-energy effective theory approach that allows for a general parameterization of Standard Model physics is needed. Future indirect constraints from Standard Model deviations may explain the non-renormalizability of quantum gravity via precision tests of general relativity and its Newtonian limit at short distances. A fundamental theory whose effective description at low energies is given by the non-renormalizable Einstein-Hilbert action may be tested, in principle, by low-energy precision methods providing signatures and indirect probes of new physics, complementary to direct searches. Such a new picture should solve existing puzzles, such as the low-energy limit of QCD, the existence of the axion or the hierarchy problem between the electroweak symmetry breaking scale and the Planck mass scale. We analyze existing theoretical predictions that go beyond the Standard Model and discuss potential precision tests of fundamental symmetries and their couplings to gravity, where low-energy observables play an important role.




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