Forbidden territories in the string landscape

  title={Forbidden territories in the string landscape},
  author={Alok Kumar and Subir Mukhopadhyay and Koushik Ray},
  journal={Journal of High Energy Physics},
Problems of stabilizing moduli of the type-IIB string theory on toroidal orientifolds T6/Z2, in presence of worldvolume fluxes on various D-branes, are considered. For Z2 actions, introducing either O9 or O3 planes, we rule out the possibility of moduli stabilization in a wide class of models with = 1 supersymmetry, characterized by the type of fluxes turned on along D-brane worldvolume. Our results, in particular, imply that Abelian worldvolume fluxes can not by themselves stabilize closed… 
1 Citations

Astrophysical and cosmological implications of large volume string compactifications

We study the spectrum, couplings and cosmological and astrophysical implications of the moduli fields for the class of Calabi–Yau IIB string compactifications for which moduli stabilisation leads to



Chiral 4d string vacua with D branes and NSNS and RR fluxes

We discuss type-IIB orientifolds with D-branes, and NSNS and RR field strength fluxes. The D-brane sectors lead to open string spectra with non-abelian gauge symmetry and charged chiral fermions. The

Moduli stabilization with open and closed string fluxes

We study the stabilization of all closed string moduli in the T 6 /Z2 orientifold, using constant internal magnetic fields and 3-form fluxes that preserve N = 1 supersymmetry in four dimensions. We

Moduli stabilization from fluxes in a simple IIB orientifold

We study novel type IIB compactifications on the T{sup 6}/Z{sub 2} orientifold. This geometry arises in the T-dual description of Type I theory on T{sup 6}, and one normally introduces 16

Nonlinear instantons from supersymmetric p-branes

Supersymmetric configurations of type II D-branes with nonzero gauge field strengths in general supersymmetric backgrounds with nonzero B fields are analyzed using the kappa-symmetric worldvolume

De Sitter vacua in string theory

We outline the construction of metastable de Sitter vacua of type IIB string theory. Our starting point is highly warped IIB compactifications with nontrivial NS and RR three-form fluxes. By