The Future of Particle and Nuclear Physics

Physics – Condensed Matter – Superconductivity

Scientific paper

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Scientific paper

The standard model of particle physics is extremely successful, but incomplete. Its mathematical structure suggests how it might be derived from a more comprehensive unified theory. The arguments are both aesthetic and quantitative. They predict specific new phenomena observable which will be observable at the Large Hadron Collider (LHC). Recent results on neutrino masses confirm and encourage this line of thought. Another problem within the standard model, the so-called strong CP problem, is one of a number of reasons to suspect the existence of a radically new class of very light, very weakly interacting particles. All these ideas have important implications for cosmology; in particular, they provide plausible, testable candidates for the ``dark matter''. For nuclear physics, the future is QCD. This theory opens new possibilities for understanding hadronic matter at extreme temperatures (as in the big bang, and at RHIC) and extreme density (as in neutron star interiors). Recent insights concerning color superconductivity are especially beautiful, and shed penetrating new light on the problem of quark confinement. Another lively frontier is the direct solution of the QCD equations using the full power of modern parallel computing.

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