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TASI Lectures on the cosmological constant

Description: The energy density of the vacuum, Lambda, is at least 60 orders of magnitude smaller than several known contributions to it. Approaches to this problem are tightly constrained by data ranging from elementary observations to precision experiments. Absent overwhelming evidence to the contrary, dark energy can only be interpreted as vacuum energy, so the venerable assumption that Lambda=0 conflicts with observation. The possibility remains that Lambda is fundamentally variable, though constant over large spacetime regions. This can explain the observed value, but only in a theory satisfying a number of restrictive kinematic and dynamical conditions. String theory offers a concrete realization through its landscape of metastable vacua.
Date: August 30, 2007
Creator: Bousso, Raphael & Bousso, Raphael
Partner: UNT Libraries Government Documents Department

Experiments with polarized beams and targets

Description: A lecture is given on possible experiments at the ZGS facility, and a discussion of the spin dependence of strong interactions. It is noted that the most interesting experiments will probably be studies of the differences between the various initial spin states in p + p scattering. (JFP)
Date: January 1, 1972
Creator: Krisch, A.D.
Partner: UNT Libraries Government Documents Department