713 citations
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- National and Kapodistrian University of AthensGR17 papers
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8 papers · 1 filter
Non-singular string cosmology in a 2d Hybrid model
Ioannis Florakis, Costas Kounnas, Herve Partouche +1
The existence of non-singular string cosmologies is established in a class of two-dimensional supersymmetric Hybrid models at finite temperature. The left-moving sector of the Hybr…
Induced superstring cosmologies and moduli stabilization
Tristan Catelin-Jullien, Costas Kounnas, Herve Partouche +1
We extend the analysis of the recently obtained stringy cosmological solutions induced by thermal and quantum effects, once space-time supersymmetry is spontaneously broken by geom…
Resolution of Hagedorn singularity in superstrings with gravito-magnetic fluxes
C. Angelantonj, C. Kounnas, H. Partouche +1
We consider closed type II and orientifold backgrounds where supersymmetry is spontaneously broken by asymmetric geometrical fluxes. We show that these can be used to describe ther…
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…
SU(N) gauge theories in the presence of a topological term
Luigi Del Debbio, Haralambos Panagopoulos, Ettore Vicari
We review recent results on the theta dependence of the ground-state energy and spectrum of four-dimensional SU(N) gauge theories, where theta is the coefficient of the CP-violatin…
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…