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| | Brane - An Essay by Jian-Xin Lu, Ph.D. |
 | | The other is that even though each of the five superstring theories unifies quantum mechanics with general relativity, none of them is the final theory but merely a special aspect of a fundamental and yet-unknown big theory. |
 | | However, for each of the five perturbative superstrings, we assume, from the outset, the space-time to be flat and the string coupling, which is related to the vacuum expectation value of dilaton (a massless particle in the spectrum), to be small to validate the perturbative expansion. |
 | | If the 10-dimensional superstrings are the whole story, we cannot explain the origin of the 11-dimensional supergravity which is equally good as any other supergravities on the supergravity level. |
| www.esi-topics.com /brane/interviews/DrJian-XinLu.html (1183 words) |
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