Higher derivative couplings and heterotic-Type I duality in eight dimensions
نویسندگان
چکیده
منابع مشابه
Higher Derivative Couplings and Heterotic–Type I Duality in Eight Dimensions
Abstract We calculate F 4 and RT 4g−4 couplings in d = 8 heterotic and type I string vacua (with gauge and graviphoton field strengths F, T , and Riemann curvature R). The holomorphic piece Fg of the heterotic one–loop coupling R T 4g−4 is given by a polylogarithm of index 5 − 4g and encodes the counting of genus g curves with g nodes on the K3 of the dual F–theory side. We present closed expre...
متن کامل/ EP N = 2 Type I - Heterotic Duality and Higher Derivative F - Terms
We test the conjectured Type I-Heterotic Duality in four dimensions by analyzing a given class of higher derivative F-terms of the form FgW 2g, with W the N = 2 gravitational superfield. We study a particular dual pair of theories, the O(2, 2) heterotic model and a type I model based on the K3 Z2 orbifold theory constructed by Gimon and Polchinski, further compactified on a torus. The Fg coupli...
متن کاملOn the Heterotic/f-theory Duality in Eight Dimensions
We review quantitative tests on the duality between the heterotic string on T 2 and F -theory on K3. On the heterotic side, certain threshold corrections to the effective action can be exactly computed at one-loop order, and the issue is to reproduce these from geometric quantities pertaining to the K3 surface. In doing so we learn about certain nonperturbative interactions of 7-branes.
متن کاملEvidence for Heterotic - Type I String Duality
A study is made of the implications of heterotic string T -duality and extended gauge symmetry for the conjectured equivalence of heterotic and Type I superstrings. While at first sight heterotic string world-sheet dynamics appears to conflict with Type I perturbation theory, a closer look shows that Type I perturbation theory “miraculously” breaks down, in some cases via novel mechanisms, when...
متن کاملHeterotic / Type - I Duality in D < 10 Dimensions , Threshold Corrections and D - Instantons
We continue our study of heterotic/type-I duality in D < 10 dimensions. We consider the heterotic and type-I theories compactified on tori to lower dimensions. We calculate the special (" BPS-saturated ") F 4 and R 4 terms in the effective one-loop heterotic action. These terms are expected to be non-perturbatively exact for D > 4. The heterotic result is compared with the associated type-I res...
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ژورنال
عنوان ژورنال: Nuclear Physics B
سال: 1999
ISSN: 0550-3213
DOI: 10.1016/s0550-3213(99)00408-3