Metric and coupling reversal in string theory
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- 刊名：Nuclear Physics B
- 出版年：2007
- 出版时间：1 January 2007
- 年：2007
- 卷：760
- 期：1-2
- 页码：64-88
- 全文大小：247 K
文摘
Invariance under reversing the sign of the metric GMN(x) and/or the sign of the string coupling field 3cbdf"" title=""Click to view the MathML source"">H(x), where H(x)=gs, leads to four possible universes denoted 1, , , according as (G,H)→(G,H), c5775adfff19b26ac3a03d9292"" title=""Click to view the MathML source"">(−G,H), 3ca285382ad8031b"" title=""Click to view the MathML source"">(−G,−H), 3c53eb8e195e989d940cbf8fcb6c"" title=""Click to view the MathML source"">(G,−H), respectively. Universe 1 is described by conventional string/M theory and contains all M, D, F and NS branes. Universe contains only D(−1), D3 and D7. Universe contains only D1, D5, D9 and Type I. Universe contains only F1 and NS5 of IIB and heterotic SO(32).