# Recent Talks

- Colloquium: "The Symmetries of QCD"
- Abstract: The symmetries of a quantum field theory can be realized in a variety of ways. Symmetries can be realized explicitly, approximately, through spontaneous symmetry breaking or, via an anomaly, quantum effects can dynamically eliminate a symmetry of the theory that was present at the classical level. Quantum Chromodynamics (QCD), the modern theory of the strong interactions, exemplifies each of these possibilities. The interplay of these effects determine the spectrum of particles that we observe and, ultimately, accounts for 99% of the mass of ordinary matter.
- Research Talk: "Higgsless Electroweak Symmetry Breaking"
- Abstract: Higgsless models provide electroweak symmetry breaking, including unitarization of the scattering of longitudinal W and Z bosons, without employing a scalar Higgs boson. These theories may be viewed as "dual" to more conventional walking technicolor models. I show that the salient phenomenological features of these theories can be modeled by a simple extended electroweak theory incorporating an SU(2) x SU(2) x U(1) gauge structure: the "Three site model". Using the three site model, I illustrate the electroweak and LHC phenomenology of Higgsless theories in general.
- Summer School Lectures: "Dynamical Electroweak Symmetry Breaking"
- Abstract: In theories of dynamical electroweak symmetry breaking, the electroweak interactions are broken to electromagnetism by the vacuum expectation value of a fermion bilinear. These theories may thereby avoid the introduction of fundamental scalar particles, of which we have no examples in nature. In these talks, I describe technicolor, topcolor, Higgsless, and related models, and discuss their theoretical and phenomenological properties. In doing so, I emphasize the techniques of effective field theory and its relevance to electroweak theory and phenomenology.
- Outreach Talk: "Cosmic Forces of Nature: Gravity"
- Abstract: Our modern understanding of gravity is based on general relativity, which may be summarized by the statement that "space-time geometry tells matter how to move, and matter tells space-time geometry how to curve" (J. A. Wheeler). In this talk I describe how this understanding arises from the principle of equivalence, what we mean by space-time curvature, how we know general relativity is correct, and what this means for cosmology. The talk can be adapted to various audiences, from elementary school pupils, to general adult audiences, to science teachers.

Streaming video of talks given by Chivukula at FNAL can be found here