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32 papers · 1 filter
The Limits of Extended Quintessence
S. Nesseris, L. Perivolaropoulos
We use a low redshift expansion of the cosmological equations of extended (scalar-tensor) quintessence to divide the observable Hubble history parameter space in four sectors: A fo…
Spinor-Vector Duality in fermionic Z2XZ2 heterotic orbifold models
Alon E. Faraggi, Costas Kounnas, John Rizos
We continue the classification of the fermionic Z2XZ2 heterotic string vacua with symmetric internal shifts. The space of models is spanned by working with a fixed set of boundary…
Direct Wimp Detection in Directional Experiments
J. D. Vergados, Amand Faessler
The recent WMAP data have confirmed that exotic dark matter together with the vacuum energy (cosmological constant) dominate in the flat Universe. Thus the direct dark matter searc…
Brane Cosmology with a Non-Minimally Coupled Bulk-Scalar Field
C. Bogdanos, A. Dimitriadis, K. Tamvakis
We consider the cosmological evolution of a brane in the presence of a bulk scalar field coupled to the Ricci scalar through a term f(ϕ)R. We derive the generalized Friedmann equat…
Dark energy from bulk matter
C. Bogdanos, A. Dimitriadis, K. Tamvakis
We consider the possibility of getting accelerated expansion and w=-1 crossing in the context of a braneworld cosmological setup, endowed with a bulk energy-momentum tensor. For a…
Dark Matter in the Cosmos- Exploiting the Signatures of its Interaction with Nuclei
J. D. Vergados
We review various issues related to the direct detection of constituents of dark matter, which are assumed to be Weakly Interacting Massive Particles (WIMPs). We specifically consi…