Anomalies, D-flatness and small instantons
نویسندگان
چکیده
منابع مشابه
Anomalies, D-flatness and Small Instantons
Recently, Witten has proposed a mechanism for symmetry enhancement in SO(32) heterotic string theory, where the singularity obtained by shrinking an instanton to zero size is resolved by the appearance of an Sp(1) gauge symmetry. In this short letter, we consider spacetime constraints from anomaly cancellation in six dimensions and D-flatness and demonstrate a subtlety which arises in the modul...
متن کاملD-instantons and twistors
Finding the exact, quantum corrected metric on the hypermultiplet moduli space in Type II string compactifications on Calabi-Yau threefolds is an outstanding open problem. We address this issue by relating the quaternionic-Kähler metric on the hypermultiplet moduli space to the complex contact geometry on its twistor space. In this framework, Euclidean D-brane instantons are captured by contact...
متن کاملMonads and D-instantons
Motivated by twisted N = 4 supersymmetric Yang-Mills theory in 4 dimensions, a natural extension of the monad (ADHM) construction relevant to D-instantons is considered. We show that a family of Yang-Mills instantons can be constructed from D-instantons. We discuss some possible roles of reciprocity in D-brane physics. We conjecture the existence of universal instantons together with a generali...
متن کاملD-instantons and Matrix Models
We discuss the Matrix Model aspect of configurations saturating a fixed number of fermionic zero modes. This number is independent of the rank of the gauge group and the instanton number. This will allow us to define a large-Nc limit of the embedding of K D-instantons in the Matrix Model and make contact with the leading term (the measure factor) of the supergravity computations of D-instanton ...
متن کاملD-Instantons and asymptotic geometries
The large N limit of D3-branes is expected to correspond to a superconformal field theory living on the boundary of the anti-de Sitter space appearing in the near-horizon geometry. Dualizing the D3-brane to a D-instanton, we show that this limit is equivalent to a type IIB S-duality. In both cases one effectively reaches the near-horizon geometry. This provides an alternative approach to an ear...
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: Physics Letters B
سال: 1996
ISSN: 0370-2693
DOI: 10.1016/0370-2693(96)00342-5