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CERN Document Server 32 elementer funnet  1 - 10nesteslutt  gå til element: Søket tok 1.29 sekunder. 
1.
String Model Building on Quantum Annealers / Abel, Steven A. (CERN ; Durham U., IPPP ; Durham U.) ; Nutricati, Luca A. (Durham U., IPPP ; Durham U.) ; Rizos, John (Ioannina U.)
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 simulated annealing, random scans, and genetic algorithms, we highlight the potential advantages offered by quantum annealers, which in this study promised to be roughly fifty times faster than random scans and genetic algorithm and approximately four times faster than simulated annealing..
arXiv:2306.16801.- 2023-12-01 - 8 p. - Published in : Fortschr. Phys. 71 (2023) 2300167 Fulltext: document - PDF; 2306.16801 - PDF;
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2.
Chiral Heterotic Strings with Positive Cosmological Constant / Florakis, Ioannis (CERN) ; Rizos, John (Ioannina U.)
We present explicit examples of semi-realistic heterotic models with spontaneously broken supersymmetry, which dynamically lead to breaking scales much smaller than $M_{\rm Planck}$ and exponentially small positive values for the cosmological constant. Contrary to field theoretic intuition, we find that the global structure of the effective potential is significantly affected by contributions of massive and non-level matched string states and we investigate the conditions that dynamically ensure a number of desired properties..
arXiv:1608.04582; CERN-TH-2016-179; CERN-TH-2016-179.- 2016-12 - 39 p. - Published in : Nucl. Phys. B 913 (2016) 495-533 Article from SCOAP3: PDF; Fulltext: PDF; External link: Preprint
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3.
Classification of Heterotic Pati-Salam Models / Assel, Benjamin ; Christodoulides, Kyriakos ; Faraggi, Alon E ; Kounnas, Costas ; Rizos, John
We extend the classification of free fermionic heterotic-string models to vacua in which the SO(10) GUT symmetry is broken at the string level to the Pati-Salam subgroup. [...]
arXiv:1007.2268. - 2010.
Preprint
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4.
The "landscape" of Pati--Salam heterotic superstring vacua / Rizos, J (University of Ioannina)
The main aspects of a recently developed method for classification of heterotic superstring vacua in the Free Fermionic Formulation are presented. Using these techniques we classify a big number of approximately $10^{15}$ heterotic string vacua with Pati--Salam, SU(4)x{SU(2)}_Lx{SU(2)}_R gauge symmetry with respect to their main phenomenological features as the number of families, Pati--Salam breaking Higgs, Standard Model Higgs doublets, additional triplets and exotic charge states. [...]
arXiv:1003.0458.- 2010 - 4 p. - Published in : Fortschr. Phys. 58 (2010) 758-762 External link: Preprint
In : Corfu Summmer Institute, 9th Hellenic School and Workshops on Elementary Particle Physics and Gravity, Corfu, Greece, 30 Aug - 20 Sep 2009, pp.758-762
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5.
Hierarchical Neutrino Masses and Mixing in Flipped-SU(5) / Rizos, J (Ioannina U.) ; Tamvakis, K (Ioannina U. ; CERN)
We consider the problem of neutrino masses and mixing in the framework of flipped SU(5). The right-handed neutrino mass, generated through the operation of a seesaw mechanism by a sector of gauge singlets, leads naturally, at a subsequent level, to the standard seesaw mechanism resulting into three light neutrino states with masses of the desired phenomenological order of magnitude. [...]
arXiv:0912.3997.- 2010 - Published in : Phys. Lett. B 685 (2010) 67-71 External link: Preprint
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6.
Exophobic Quasi-Realistic Heterotic String Vacua / Assel, Benjamin ; Christodoulides, Kyriakos ; Faraggi, Alon E ; Kounnas, Costas ; Rizos, John
We demonstrate the existence of heterotic-string vacua that are free of massless exotic fields. [...]
arXiv:0910.3697 ; LPTENS-09-28 ; LTH-843. - 2009.
Preprint
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7.
Anomalous U(1)'s in type I string vacua / Antoniadis, Ignatios ; Kiritsis, Elias B ; Rizos, J
We perform a systematic string computation of the masses of anomalous U (1) gauge bosons in four-dimensional orientifold vacua, and we study their localization properties in the internal (compactified) space. We find that N = 1 supersymmetric sectors yield four- dimensional contributions, localized in the whole six-dimensional internal space, while N = 2 sectors give contributions localized in four internal dimensions. [...]
2002 - Published in : Nucl. Phys. B 637 (2002) 92-118
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8.
D-branes and the Standard Model / Antoniadis, Ignatios ; Kiritsis, Elias B ; Rizos, J ; Tomaras, T N
We perform a systematic study of the Standard Model embedding in a D-brane configuration of type I string theory at the TeV scale. We end up with an attractive model and we study several phenomenological questions, such as gauge coupling unification, proton stability, fermion masses and neutrino oscillations. [...]
hep-th/0210263; CERN-TH-2002-272.- Geneva : CERN, 2003 - 42 p. - Published in : Nucl. Phys. B 660 (2003) 81-115 Access to fulltext document: PDF; External link: hep-th/0210263 PDF
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9.
Anomalous U(1)s in Type I superstring vacua / Antoniadis, Ignatios (CERN) ; Kiritsis, Elias (Ecole Normale Superieure ; Crete U.) ; Rizos, John (Ioannina U.)
We perform a systematic string computation of the masses of anomalous U(1) gauge bosons in four-dimensional orientifold vacua, and we study their localization properties in the internal (compactified) space. We find that N=1 supersymmetric sectors yield four-dimensional contributions, localized in the whole six-dimensional internal space, while N=2 sectors give contributions localized in four internal dimensions. [...]
hep-th/0204153; CERN-TH-2002-083; LPTENS-02-21; CERN-TH-2002-083; LPT-ENS-2002-21.- Geneva : CERN, 2002 - 30 p. - Published in : Nucl. Phys. B 637 (2002) 92-118 Access to fulltext document: PDF; Fulltext: PDF; External link: Preprint - Please contact the library if you need to access this document.
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10.
A Pati-Salam model from branes / Leontaris, George K ; Rizos, J
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 fields compatible with a Type I brane configuration. [...]
hep-ph/0012255; CPTH-S-093.- Geneva : CERN, 2001 - 14 p. - Published in : Phys. Lett. B 510 (2001) 295-304 Access to fulltext document: PDF; External link: hep-ph/0012255 PDF
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