6 research outputs found
On the Initial Singularity Problem in Two Dimensional Quantum Cosmology
The problem of how to put interactions in two-dimensional quantum gravity in
the strong coupling regime is studied. It shows that the most general
interaction consistent with this symmetry is a Liouville term that contain two
parameters satisfying the algebraic relation in order to assure the closure of the diffeomorphism algebra. The model is
classically soluble and it contains as general solution the temporal
singularity. The theory is quantized and we show that the propagation amplitude
fall tozero in . This result shows that the classical singularities
are smoothed by quantum effects and the bing-bang concept could be considered
as a classical extrapolation instead of a physical concept.Comment: 9pp, Revtex 3.0. New references added. To appear in Phys. Rev.
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FIXED-t DISPERSION RELATIONS AND POLARIZATION IN PION NUCLEON CHARGE EXCHANGE SCATTERING
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Spin content of string models
A previous analysis of the spin content of the bosonic string is extended to other string models. For the case of the spinning string, the O(
D − 1) representation counting functions are expanded in terms of GL (∞|∞) supergroup characters