Zobrazeno 1 - 10
of 795
pro vyhledávání: '"Kounnas, C."'
Publikováno v:
in ''Superstring theory in the 21st Century,'' Horizons in World Physics Vol. 270 (2011), G. B. Charney (editor), 135-160
In this work, we review the results of Refs [1]-[5] dedicated to the description of the early Universe cosmology induced by quantum and thermal effects in superstring theories. The present evolution of the Universe is described very accurately by the
Externí odkaz:
http://arxiv.org/abs/0910.2814
Publikováno v:
Nucl.Phys.B809:291-307,2009
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 thermal ensembles with chemical potentials associated to "gravito-magnetic
Externí odkaz:
http://arxiv.org/abs/0808.1357
Publikováno v:
JHEP 0709:051,2007
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 depends on the background fluxes of the internal manifold, or equivalently h
Externí odkaz:
http://arxiv.org/abs/0707.4270
Publikováno v:
J.Phys.Conf.Ser.53:611-620,2006
Based on the correspondence between the N = 1 superstring compactifications with fluxes and the N = 4 gauged supergravities, we study effective N = 1 four-dimensional supergravity potentials arising from fluxes and gaugino condensates in the framewor
Externí odkaz:
http://arxiv.org/abs/hep-th/0602111
Publikováno v:
Fortsch.Phys.53:926-935,2005
We illustrate the correspondence between the N=1 superstring compactifications with fluxes, the N=4 gauged supergravities and the superpotential and K\"ahler potential of the effective N=1 supergravity in four dimensions. In particular we derive, in
Externí odkaz:
http://arxiv.org/abs/hep-th/0503229
Publikováno v:
Nucl.Phys. B695 (2004) 41-72
The first particle physics observable whose origin may be sought in string theory is the triple replication of the matter generations. The class of Z2XZ2 orbifolds of six dimensional compactified tori, that have been most widely studied in the free f
Externí odkaz:
http://arxiv.org/abs/hep-th/0403058
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 several ways to overcome this strong-coupling problem. We review those
Externí odkaz:
http://arxiv.org/abs/hep-th/0312300
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 are related to the existence of three twisted sectors in Z2XZ2 orbifolds
Externí odkaz:
http://arxiv.org/abs/hep-th/0311058
Publikováno v:
Nucl.Phys. B637 (2002) 378-394
We propose a new cosmological scenario which resolves the conventional initial singularity problem. The space-time geometry has an unconventional time-like singularity on a lower dimensional hypersurface, with localized energy density. The natural in
Externí odkaz:
http://arxiv.org/abs/hep-th/0204261
Publikováno v:
Nucl.Phys.B652:165-195,2003
Five-brane distributions with no strong coupling problems and high symmetry are studied. The simplest configuration corresponds to a spherical shell of branes with S^3 geometry and symmetry. The equations of motions with delta-function sources are ca
Externí odkaz:
http://arxiv.org/abs/hep-th/0204201