48 citations · 80 across the 5 of their papers we have counts for
15 papers · 1 filter
Spinor-Vector Duality in N=2 Heterotic String Vacua
Alon E. Faraggi, Costas Kounnas, John Rizos
Classification of the N=1 space-time supersymmetric fermionic Z2XZ2 heterotic-string vacua with symmetric internal shifts, revealed a novel spinor-vector duality symmetry over the…
Inflationary de Sitter solutions from superstrings
Costas Kounnas, Herve Partouche
In the framework of superstring compactifications with N=1 supersymmetry spontaneously broken, (by either geometrical fluxes, branes or else), we show the existence of new inflatio…
Instanton transition in thermal and moduli deformed de Sitter cosmology
Costas Kounnas, Herve Partouche
We consider the de Sitter cosmology deformed by the presence of a thermal bath of radiation and/or time-dependent moduli fields. Depending on the parameters, either a first or seco…
Five-Brane Configurations, Conformal Field Theories and the Strong-Coupling Problem
E. Kiritsis, C. Kounnas, P. M. Petropoulos +1
Decoupling limits of physical interest occur in regions of space--time where the string coupling diverges. This is illustrated in the celebrated example of five-branes. There are s…
Towards the classification of Z2XZ2 fermionic models
A. E. Faraggi, C. Kounnas, S. E. M. Nooij +1
We develop a formalism that allows a complete classification of four-dimensional Z2XZ2 heterotic string models. Three generation models in a sub-class of these compactifications ar…
Conformal String Sector of M-Theory
Costas Kounnas
We consider a conformal system of a string and a particle defined in D=10+2 space-time dimensions. The extra time-like dimension is a gauge artifact and can be eliminated by choosi…