Pragmatic solutions to reduce the global burden of stroke: a World Stroke Organization-Lancet Neurology Commission.

Feigin V. L., Owolabi M. O., Abanto C., Addissie A., Adeleye A. O., Adilbekov Y., ...More

The Lancet. Neurology, vol.22, pp.1160-1206, 2023 (SCI-Expanded) identifier identifier identifier identifier

  • Publication Type: Article / Article
  • Volume: 22
  • Publication Date: 2023
  • Doi Number: 10.1016/s1474-4422(23)00277-6
  • Journal Name: The Lancet. Neurology
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Academic Search Premier, CINAHL, MEDLINE, Psycinfo
  • Page Numbers: pp.1160-1206
  • Eskisehir Osmangazi University Affiliated: Yes

Abstract

We develop techniques to classify D- and F-flat directions for N=1 supersymmetric string vacua of the perturbative heterotic string theory, which possess an anomalous U(1) gauge group at the tree level. Genus-one corrections generate a Fayet-Iliopoulos term for the D-term of U(1)_A, which is canceled by non-zero vacuum expectation values (VEVs) of certain massless multiplets in such a way that the anomalous U(1) is broken, while maintaining the D- and F-flatness of the effective field theory. A systematic analysis of flat directions is given for non-zero VEVs of non-Abelian singlets, and the techniques are illustrated for a specific model. The approach sets the stage to classify the D- and F-flat directions for a large class of perturbative string vacua. This classification is a prerequisite to address systematically the phenomenological consequences of these models.