2017/03/09 by Hiroyuki Abe, Hiroyuki Abé, Tatsuo Kobayashi +2 · 11 citations
Physics and Astronomy · #Black Holes and Theoretical Physics #Brane #Dilaton #Instanton #Mathematical physics #Moduli #Nonlinear Waves and Solitons #Orbifold #Orientifold #Physics #Pulsars and Gravitational Waves Research #Quantum mechanics #String theory #Superpotential #Supersymmetry #Theoretical physics #hep-ph #hep-th
paper · pdf · doi:10.1103/physrevd.96.026019
published in Physical review. D/Physical review. D. 96(2) (American Physical Society) · 21 pages, 2 figures
arxiv created 2017/03/09 · openalex publication_date 2017/07/25 · openalex created_date 2017/07/31 · arxiv updated 2017/08/02 · openalex updated_date 2026/08/06
We study K"ahler moduli stabilizations in semirealistic magnetized D-brane models based on Z2\ifmmode×\else\texttimes\fiZ2^\ensuremath' toroidal orbifolds. In type IIB compactifications, 3-form fluxes can stabilize the dilaton and complex structure moduli fields, but there remain some massless closed string moduli fields, K"ahler moduli. The magnetic fluxes generate Fayet-Iliopoulos terms, which can fix ratios of K"ahler moduli. On top of that, we consider D-brane instanton effects to stabilize them in concrete D-brane models and investigate the brane configurations to confirm that the moduli fields can be stabilized successfully. In this paper, we treat two types of D-brane models. One is based on D9-brane systems respecting the Pati-Salam model. The other is realized in a D7-brane system breaking the Pati-Salam gauge group. We find suitable configurations where the D-brane instantons can stabilize the moduli fields within both types of D-brane models, explaining an origin of a small constant term of the superpotential, which is a key ingredient for successful moduli stabilizations.