Physics – High Energy Physics – High Energy Physics - Theory
Scientific paper
2003-07-27
Phys.Rev. D69 (2004) 066010
Physics
High Energy Physics
High Energy Physics - Theory
42 pages, LaTeX, 2 figures
Scientific paper
10.1103/PhysRevD.69.066010
We consider Neveu-Schwarz pp-waves with spacetime supersymmetry. Upon compactification of a spacelike direction, these backgrounds develop Closed Null Curves (CNCs) and Closed Timelike Curves (CTCs), and are U-dual to supersymmetric Godel type universes. We study classical and quantum strings in this background, with emphasis on the strings winding around the compact direction. We consider two types of strings: long strings stabilized by NS flux and rotating strings which are stabilized against collapse by angular momentum. Some of the latter strings wrap around CNCs and CTCs, and are thus a potential source of pathology. We analyze the partition function, and in particular discuss the effects of these string states. Although our results are not conclusive, the partition function seems to be dramatically altered due to the presence of CNCs and CTCs. We discuss some interpretations of our results, including a possible sign of unitary violation.
Brace Daniel
Herdeiro Carlos A. R.
Hirano Shinji
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