Penrose limit and enhancon geometry
Feb, 200325 pages
Published in:
- Phys.Rev.D 67 (2003) 126005
e-Print:
- hep-th/0302127 [hep-th]
Report number:
- TIT-HEP-492
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Abstract:
We study superstring theories on the Penrose limit of the enhancon geometry realized by the D(p+4)-branes wrapped on a K3 surface. We first examine the null geodesics with fixed radius in general brane backgrounds, which give solvable superstring theories with constant masses. In most cases, the superstring theories contain negative mass-squared. We clarify a condition that the world-sheet free fields have positive mass-squared. We then apply this condition to the enhancon geometry and find that the null geodesics with fixed radius exist only for p=0 case. They define the superstring theories with positive mass-squared. For p>0 case, we show that there is no null geodesic with fixed radius. We also discuss the decoupling limit which gives the dual geometry of super Yang-Mills theory with 8 supercharges. We discuss the K3-volume dependence of the superstring spectrum.- 11.25.Uv
- membrane model: D-brane
- membrane model: p-brane
- string model
- supersymmetry
- field theory: Kaehler
- plane wave
- enhancon: geometry
- Penrose limit
- decoupling
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