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24 papers · 1 filter
A Pati-Salam model from branes
G. K. Leontaris, J. Rizos
We explore the possibility of embedding the Pati-Salam model in the context of Type I brane models. We study a generic model with U(4)_C x U(2)_L x U(2)_R gauge symmetry and matter…
Cold Dark Matter detection in SUSY models at large tan(beta)
M. E. Gomez, J. D. Vergados
We study the direct detection rate for SUSY cold dark matter (CDM) predicted by the minimal supersymmetric standard model with universal boundary conditions and large values for ta…
World volume Supermembrane Instantons in the light-cone frame
E. G. Floratos, G. K. Leontaris
In this review we present the octonionic duality for membranes. We start with a discussion on the relation of the Yang Mills theories and the supermembrane Hamiltonian in the light…
A Novel Mass Hierarchy and Discrete Excitation Spectra from Quantum-Fluctuating D-branes
G. K. Leontaris, N. E. Mavromatos
We elaborate further on a recently proposed scenario for generating a mass hierarchy through quantum fluctuations of a single D3 brane, which represents our world embedded in a bul…
A Self-Tuning Solution of the Cosmological Constant Problem
A. Kehagias, K. Tamvakis
We discuss the four-dimensional cosmological constant problem in a five-dimensional setting. A scalar field coupled to the SM forms dynamically a smooth brane with four-dimensional…
On the String-Theoretic Euler Number of a Class of Absolutely Isolated Singularities
Dimitrios I. Dais
An explicit computation of the so-called string-theoretic E-function of a normal complex variety X with at most log-terminal singularities can be achieved by constructing one snc-d…