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- W3102856066 abstract "We study further the r^ole of the boundary operator $O_B$ for macroscopic loop length in the stable definition of 2D quantum gravity provided by the $[{tilde P},Q]=Q$ formulation. The KdV flows are supplemented by an additional flow with respect to the boundary cosmological constant $sigma$. We numerically study these flows for the $m=1$, $2$ and $3$ models, solving for the string susceptibility in the presence of $O_B$ for arbitrary coupling $sigma$. The spectrum of the Hamiltonian of the loop quantum mechanics is continuous and bounded from below by $sigma$. For large positive $sigma$, the theory is dominated by the `universal' $m=0$ topological phase present only in the $[{tilde P},Q]=Q$ formulation. For large negative $sigma$, the non--perturbative physics approaches that of the $[P,Q]=1$ definition, although there is no path to the unstable solutions of the $[P,Q]=1$ $m$-even models." @default.
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- W3102856066 date "1992-10-01" @default.
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- W3102856066 title "The boundary cosmological constant in stable 2D quantum gravity" @default.
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- W3102856066 doi "https://doi.org/10.1016/0370-2693(92)91176-a" @default.
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