Written in English
|Statement||Maria E. Angulo.|
|Series||Sussex theses ; S 5466|
|The Physical Object|
|Number of Pages||130|
The tadpole‐cancellation condition is an important consistency conditions for type I string theories. It links the closed‐string to the open‐string sector and puts strong constraints on the allowed D‐brane configurations (for a review see for instance1).Cited by: 8. Tadpole and anomaly cancellation in Type IIB string theories Author: Angulo, Maria E. ISNI: Awarding Body: University of Sussex Current Institution: University of Sussex Date of Award: Availability of Full Text: Access from EThOS. cancellation constraints x almost uniquely the massless particle content of the theory. In Type I vacua in lower dimensions, like in Type IIB D =4;6 orientifolds, tadpole cancellation constraints do also imply anomaly cancellation. An interesting question arises regarding the extent up to which anomaly cancellation and tadpole cancellation are. Anomaliesand Tadpoles The cancellation of anomalies is an important constraint on a string vaccum, which has to be diagnosed in our two dimensional superstring theory constructions.
We derive and generalize the RR twisted tadpole cancellation conditions necessary to obtain consistent D=4, Z_N orbifold compactifications of Type IIB string theory. At least two different types of branes (or antibranes with opposite RR charges) are introduced into the construction. The cancellation of U(1)-gauge and U(1)-gravitational anomalies in certain D = 4 N = 1 type-IIB orientifolds is analyzed in detail, from a string theory point of view. We study string theory propagating on by constructing orientfolds of Type IIB string theory compactified on the orbifold limits of the K3 surface. Tadpole and Anomaly Cancellation Conditions. It is obtained by modding Type IIB theory on a torus T6 by the standard Z3 action with v = ~ (1, 1, -2). In this case there are only 9-branes and tadpole cancellation conditions L.E. Ibdnez et al./Nuclear Physics B () require Tryo = Tryl = The unique solution (up to irrelevant phases) is yl = exp(-2iTrV.
Anomalies have proven to play a prominent role in the study of non-trivial vacua of string theory. Their cancellation constitute a very severe constraint on the low-energy quantum field theory, which can be usually understood in string theory as consequence of basic consistency requirements, like modular invariance and tadpole cancellation. Tadpole conditions in F theory and the Euler characteristic of singular varieties Mboyo Esole Institute of Theoretical Physics KU Leuven P. Aluffi and M.E., Chern Class identities from tadpole matching in type IIB and F-theory, to appear P. Aluffi, A. Collinucci, F. Denef, and M.E,D-brane Deconstruction in type IIB orientifolds, to appear. In the presence of D-branes, plain type II string theory in fact has a quantum anomaly reflected on the worldsheet by tadpole Feynman diagrams in the string perturbation series for RR-fields graphics grabbed from Blumenhagen-Lüst-Theisen 13 and reflected in target spacetime by non-trivial total RR-field flux on compact spaces. gauge group to be SO(32) [17, 18, 19]. This can also be understood as an anomaly cancellation condition in the low-energy e ective action . Type I string theory contains Dirichlet p-branes for p=1;5;9. This follows, for example, from the fact that type I can be understood as the orientifold of type IIB string theory, together 4.