101 citations · 573 across the 16 of their papers we have counts for
6 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…
Thermal/quantum effects and induced superstring cosmologies
Tristan Catelin-Jullien, Costas Kounnas, Herve Partouche +1
We consider classical superstring theories on flat four dimensional space-times, and where N=4 or N=2 supersymmetry is spontaneously broken. We obtain the thermal and quantum corre…
AdS4 flux vacua in type II superstrings and their domain-wall solutions
C. Kounnas, D. Lust, P. M. Petropoulos +1
We investigate the emergence of supersymmetric negative-vacuum-energy ground states in four dimensions. First, we rely on the analysis of the effective superpotential, which depend…
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…
A Wave-function for Stringy Universes
Costas Kounnas, Nicolaos Toumbas, Jan Troost
We define a wave-function for string theory cosmological backgrounds. We give a prescription for computing its norm following an earlier analysis within general relativity. Under E…