開始日時	2020/09/18　15:00
終了日時	2020/09/18　16:00
講演者	大川 祐司　教授　( 東京大学 )
会場	オンライン (zoom)
連絡先	---
言語	English
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概要

In typical examples of the AdS/CFT correspondence, the world-sheet theory with holes in the presence of D-branes is assumed to be equivalent in a low-energy limit to a world-sheet theory without holes for a different background such as AdS₅ × S⁵. In the case of the bosonic string, we claim under the assumption of this equivalence that open string field theory on N coincident D-branes can be used to provide a nonperturbative definition of closed string theory based on the fact that the 1/N expansion of correlation functions of gauge-invariant operators reproduces the world-sheet theory with holes where the moduli space of Riemann surfaces is precisely covered.