J. Rizos
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View article: The Flipped SU(5) × U(1) Model from Four-Dimensional Strings
The Flipped SU(5) × U(1) Model from Four-Dimensional Strings Open
We review the construction of a flipped SU(5)×U(1) model in the context of the Free-Fermionic Formulation of four-dimensional strings and present its main phenomenological consequences in particle physics and cosmology.
View article: From free-fermionic constructions to orbifolds and back
From free-fermionic constructions to orbifolds and back Open
A bstract We systematically develop the explicit map between string vacua constructed in the Free Fermionic Formulation and their $$ {\mathbb{Z}}_2^N $$ toroidal orbifold counterparts. We illustrate the map in various example classes …
View article: From Free-Fermionic Constructions to Orbifolds and Back
From Free-Fermionic Constructions to Orbifolds and Back Open
We systematically develop the explicit map between string vacua constructed in the Free Fermionic Formulation and their $\mathbb{Z}_2^N$ toroidal orbifold counterparts. We illustrate the map in various example classes of models, including …
View article: String Model Building on Quantum Annealers
String Model Building on Quantum Annealers Open
For the first time the direct construction of string models on quantum annealers has been explored and has been investigated their efficiency and effectiveness in the model discovery process. Through a thorough comparison with traditional …
View article: String Model Building on Quantum Annealers
String Model Building on Quantum Annealers Open
We explore for the first time the direct construction of string models on quantum annealers, and investigate their efficiency and effectiveness in the model discovery process. Through a thorough comparison with traditional methods such as …
View article: Three-generation super no-scale models in heterotic superstrings
Three-generation super no-scale models in heterotic superstrings Open
We derive the conditions for the one-loop contribution to the cosmological constant to be exponentially suppressed in a class of heterotic string compactifications with three generations of chiral matter, where supersymmetry is spontaneous…
View article: On Non-Supersymmetric String Model Building
On Non-Supersymmetric String Model Building Open
We study a class of heterotic string compactifications possessing $SO(10)$ ``observable" gauge symmetry and spontaneously broken supersymmetry via the Scherk--Schwartz mechanism. We formulate a set of phenomenological criteria and identify…
View article: Classification of standard-like heterotic-string vacua
Classification of standard-like heterotic-string vacua Open
We extend the free fermionic classification methodology to the class of standard-like heterotic-string vacua, in which the $SO(10)$ GUT symmetry is broken at the string level to $SU(3)\times SU(2)\times U(1)^2$. The space of GGSO free phas…
View article: A solution to the decompactification problem in chiral heterotic strings
A solution to the decompactification problem in chiral heterotic strings Open
We present a solution to the decompactification problem of gauge thresholds\nin chiral heterotic string theories with two large extra dimensions, where\nsupersymmetry is spontaneously broken by the Scherk-Schwarz mechanism. Whenever\nthe K…
View article: The Use of Detention for Asylum Seekers and Migrants in Europe and Greece (Policy Paper)
The Use of Detention for Asylum Seekers and Migrants in Europe and Greece (Policy Paper) Open
This policy paper focuses on the legality of and terms of detention in regards to migration in Europe. The analysis is mainly focused on the legal instruments of the Council of Europe, the European Union, and the Greek domestic system.
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View article: Spinor-vector duality and light Z’ in heterotic strings
Spinor-vector duality and light Z’ in heterotic strings Open
We discuss the construction of heterotic-string models that allow for the existence of an extra Z at low scales.One of the main difficulties encountered is that the desired symmetries tend to be anomalous in the prevailing three generation…