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hep-ph2000
Scales and Phases in Particle Physics and Cosmology
R. D. Peccei
I describe and analyze the various energy scales that emerge from studying the structure of the Standard Models of particle physics and cosmology. Remarkably, save for the scale of…
hep-ph2000
Light Scalars in Cosmology
R. D. Peccei
I discuss here some of the constraints imposed by quantum and gravitational corrections on two hypothetical excitations, axions and quintessence, which have important cosmological…
hep-ph2000
Exact and Broken Symmetries in Particle Physics
R. D. Peccei
In these lectures, I discuss the role of symmetries in particle physics. I begin by discussing global symmetries and show that they can be realized differently in nature, depending…