Type IIB orientifolds, F-theory, Type I strings on orbifolds and Type I-heterotic duality
نویسندگان
چکیده
منابع مشابه
Type IIB Orientifolds, F-theory, Type I Strings on Orbifolds and Type I - Heterotic Duality
We consider six and four dimensional N = 1 supersymmetric orientifolds of Type IIB compactified on orbifolds. We give the conditions under which the perturbative world-sheet orientifold approach is adequate, and list the four dimensional N = 1 orientifolds (which are rather constrained) that satisfy these conditions. We argue that in most cases orientifolds contain non-perturbative sectors that...
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 کاملOn the Complementarity of F-theory, Orientifolds, and Heterotic Strings
We study F-theory duals of six dimensional heterotic vacua in extreme regions of moduli space where the heterotic string is very strongly coupled. We demonstrate how to use orientifold limits of these F-theory duals to regain a perturbative string description. As an example, we reproduce the spectrum of a T /ZZ4 orientifold as an F-theory vacuum with a singular K3 fibration. We relate this vacu...
متن کاملHeterotic versus Type I
I compare the (prototype) calculations of special F 4 and R terms in the effective actions of the Spin(32)/Z2 heterotic and type I string theories, compactified on S and T . Besides checking duality, this elucidates the quantitative rules of D-brane calculus. I explain in particular (a) why D-branes do not run in loops, and (b) how their instanton contributions arise from orbifold fixed points ...
متن کاملNon - Abelian Born - Infeld Action and Type I – Heterotic Duality ( I ) : Heterotic F 6 Terms at Two Loops ∗
We study the two-loop F 6 interactions in SO(32) heterotic superstring theory in D=10. By using the generalized Riemann identity we are able to determine the single-trace part of the effective action up to a few constants which are related to certain scattering amplitudes. This two-loop heterotic result is related by duality to Type I interactions at the tree level. However, it turns out to be ...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Nuclear Physics B
سال: 1998
ISSN: 0550-3213
DOI: 10.1016/s0550-3213(98)00491-x