Physics – High Energy Physics – High Energy Physics - Theory
Scientific paper
2004-06-08
JHEP0411:042,2004
Physics
High Energy Physics
High Energy Physics - Theory
20 pages, minor collections
Scientific paper
10.1088/1126-6708/2004/11/042
We study Ricci-flat deformations of orbifolds in type II theory. We obtain a simple formula for mass corrections to the twisted modes due to the deformations, and apply it to originally tachyonic and massless states in several examples. In the case of supersymmetric orbifolds, we find that tachyonic states appear when the deformation breaks all the supersymmetries. We also study nonsupersymmetric orbifolds C^2/Z_{2N(2N+1)}, which is T-dual to N type 0 NS5-branes. For N>=2, we compute mass corrections for states, which have string scale tachyonic masses. We find that the corrected masses coincide to ones obtained by solving the wave equation for the tachyon field in the smeared type 0 NS5-brane background geometry. For N=1, we show that the unstable mode representing the bubble creation is the unique tachyonic mode.
Imamura Yosuke
Koyama Fumikazu
Nobuyama Ryuji
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