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Counting papers with at most 25 authors, so collaboration author lists do not stand in for the people here.
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19 papers · 1 filter
First Order Metal-Insulator Transition in Two-dimensional Disordered Systems
Shie-Jie Xiong, G. N. Katomeris, S. N. Evangelou
In the absence of magnetic field or spin-orbit coupling the one-parameter scaling theory predicts localization of all states in two-dimensional (2D) disordered systems, for any amo…
Training Reinforcement Neurocontrollers Using the Polytope Algorithm
A. Likas, I. E. Lagaris
A new training algorithm is presented for delayed reinforcement learning problems that does not assume the existence of a critic model and employs the polytope optimization algorit…
Q-Balls and the Proton Stability in Supersymmetric Theories
M. Axenides, E. G. Floratos, G. K. Leontaris +1
Abelian non-topological solitons with Baryon and/or Lepton quantum numbers naturally appear in the spectrum of the minimal supersymmetric standard model. They arise as a consequenc…
Generalized Calogero models through reductions by discrete symmetries
Alexios P. Polychronakos
We construct generalizations of the Calogero-Sutherland-Moser system by appropriately reducing a classical Calogero model by a subset of its discrete symmetries. Such reductions re…
U(1) textures and Lepton Flavor Violation
M. E. Gomez, G. K. Leontaris, S. Lola +1
U(1) family symmetries have led to successful predictions of the fermion mass spectrum and the mixing angles of the hadronic sector. In the context of the supersymmetric unified th…
Stabilized NMSSM without Domain Walls
C. Panagiotakopoulos, K. Tamvakis
We reconsider the Next to Minimal Supersymmetric Standard Model (NMSSM) as a natural solution to the -problem and show that both the stability and the cosmological domain wall p…
Textures for Neutrino Mass Matrices in Gauge Theories
S. Lola, J. D. Vergados
We review previous work on neutrino mass textures in gauge theories. Such textures may arise as a result of flavour symmetries. In a given theory, it is possible to give a classifi…
Suppressing dimension-5 operators in general SU(5) models
M. E. Gomez, J. Rizos, K. Tamvakis
We discuss dimension-5 operators in supersymmetric models containing extra hypercharge 1/3 color-triplets. We derive a general formula relating dimension-5 operator to the color-tr…
String Threshold corrections in models with spontaneously broken supersymmetry
E. Kiritsis, C. Kounnas, P. M. Petropoulos +1
We analyse a class of four-dimensional heterotic ground states with N=2 space-time supersymmetry. From the ten-dimensional perspective, such models can be viewed as compactificatio…
Generalized Calogero-Sutherland systems from many-matrix models
Alexios P. Polychronakos
We construct generalizations of the Calogero-Sutherland-Moser system by appropriately reducing a model involving many unitary matrices. The resulting systems consist of particles o…
One-Dimensional Extended States in Partially Disordered Planar Systems
Shi-Jie Xiong, S. N. Evangelou, E. N. Economou
We obtain analytically a continuum of one-dimensional ballistic extended states in a two-dimensional disordered system, which consists of compactly coupled random and pure square l…
Singularity-free cosmological solutions in quadratic gravity
P. Kanti, J. Rizos, K. Tamvakis
We study a general field theory of a scalar field coupled to gravity through a quadratic Gauss-Bonnet term . The coupling function has the form , where …
Linear Stability of Dilatonic Black Holes
Panagiota Kanti
In this talk, we recall the most important features of the Dilatonic Black Holes which arise in the framework of the Einstein-Dilaton-Gauss-Bonnet theory and which are dressed with…
Black Holes in the Framework of the Four-Dimensional Effective Theory of Heterotic Superstrings at Low Energies
Panagiota Kanti
In the framework of the four-dimensional effective theory of heterotic superstrings at low energies, which is considered as a generalised theory of gravity, we search for new black…
Quarks, monopoles and dyons at large N
Ulf H. Danielsson, Alexios P. Polychronakos
We study a system of external particles of various charges in N =4 super Yang-Mills in the large N limit at finite temperature. We demonstrate that at high enough temperature parti…
Lepton Flavour Violation in Unified Models with U(1)-Family Symmetries
G. K. Leontaris, N. D. Tracas
Lepton flavour non-conserving processes are examined in the context of unified models with U(1)-family symmetries which reproduce successfully the low-energy hierarchy of the fermi…
Modulation effect in the differential rate for Supersymmetric Dark Matter detection
J. D. Vergados
The modulation effect in the direct detection of supersymmetric Cold Dark Matter (CDM) particles is investigated. It is shown that, while normally the modulation effect in the tota…
A Note On R-Parity Violation and Fermion Masses
M. E. Gomez, K. Tamvakis
We consider a class of supersymmetric SU(3)\times SU(2)\times U(1) multihiggs models in which R-parity is violated through bilinear Higgs-lepton interactions. The required, due to…
The Effective Weak Mixing Angle in the MSSM
A. Dedes, A. B. Lahanas, K. Tamvakis
The predictions of the MSSM are discussed in the light of recent LEP and SLD precision data. The full supersymmetric one loop corrections to the effective weak mixing angle, experi…