21. The idea of T-duality can be extended to more complicated theories, including superstring theories . 22. Older proposals for detecting cosmic strings could now be used to investigate superstring theory . 23. For years, one big strike against superstring theory was that there were five versions. 24. He coordinated the EU network Superstring Theory 1991-1995 and 2000-2008. 25. Calabi & ndash; Yau manifolds are important in superstring theory . 26. The existence of these dualities implies that seemingly different superstring theories are actually physically equivalent. 27. A presentation of superstring theory , which is an attempt 28. Outside of superstring theory , more traditional approaches to soup up the Standard Model also failed. 29. A theory of strings that incorporates the idea of supersymmetry is called a superstring theory . 30. $15 . ) A presentation of superstring theory , which
