Abstract
We analyze the two-dimensional ℂP N − 1 sigma model defined on a finite space interval L, with various boundary conditions, in the large N limit. With the Dirichlet boundary condition at the both ends, we show that the system has a unique phase, which smoothly approaches in the large L limit the standard 2D ℂP N − 1 sigma model in confinement phase, with a constant mass generated for the n i fields. We study the full functional saddle-point equations for finite L, and solve them numerically. The latter reduces to the well-known gap equation in the large L limit. It is found that the solution satisfies actually both the Dirichlet and Neumann conditions.
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ArXiv ePrint: 1604.05630
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Bolognesi, S., Konishi, K. & Ohashi, K. Large-N ℂP N − 1 sigma model on a finite interval. J. High Energ. Phys. 2016, 73 (2016). https://doi.org/10.1007/JHEP10(2016)073
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DOI: https://doi.org/10.1007/JHEP10(2016)073