Zobrazeno 1 - 10
of 65
pro vyhledávání: '"Tracas, N. D."'
In this paper, we first demonstrate the existence of renormalization group invariant relations among the top, bottom Yukawa and the gauge colour couplings in the minimal supersymmetric SM. Based on this observation and assuming furthermore the existe
Externí odkaz:
http://arxiv.org/abs/1309.0996
Assuming the existence of a functional relation among the Standard Model (SM) couplings gauge $\alpha_1$ and quartic $\lambda$, we determine the mass of the Higgs particle. Similar considerations for the top and bottom Yukawa couplings in the minimal
Externí odkaz:
http://arxiv.org/abs/1111.6199
In a class of F-theory SU(5) GUTs the low energy chiral mass spectrum is obtained from rank one fermion mass textures with a hierarchical structure organised by U(1) symmetries embedded in the exceptional E_8 group. In these theories chiral fields re
Externí odkaz:
http://arxiv.org/abs/1102.5244
Autor:
Oikonomou, V. K., Tracas, N. D.
Publikováno v:
Int.J.Mod.Phys.A25:5935-5950,2010
In this article we consider the Casimir energy and force of massless Majorana fermions and vector bosons between parallel plates. The vector bosons satisfy perfect electric conductor boundary conditions while the Majorana fermions satisfy bag and chi
Externí odkaz:
http://arxiv.org/abs/0912.4825
Autor:
Leontaris, G. K., Tracas, N. D.
Publikováno v:
Eur.Phys.J.C67:489-498,2010
We explore the gauge coupling relations and the unification scale in F-theory SU(5) GUT broken down to the Standard Model by an internal U(1)Y gauge flux. We consider variants with exotic matter representations which may appear in these constructions
Externí odkaz:
http://arxiv.org/abs/0912.1557
Publikováno v:
Phys.Rev.D76:115009,2007
Effective low energy models arising in the context of D-brane configurations with Standard Model (SM) gauge symmetry extended by several gauged abelian factors are discussed. The models are classified according to their hypercharge embeddings consist
Externí odkaz:
http://arxiv.org/abs/0707.3724
Autor:
Kehagias, Alex, Tracas, N. D.
We perform a general 1-loop analysis by adding extra matter to the SM content, as well as by allowing a non-standard U(1)Y normalization in order to achieve unification. We find numerous solutions with U(1)Y only charged extra matter and unification
Externí odkaz:
http://arxiv.org/abs/hep-ph/0506144
Autor:
Tracas, N. D.
Publikováno v:
Mod.Phys.Lett.A19:1615-1622,2004
We investigate the $SU(3)^3$ GUT model when signs of the model (precursors), due to low compactification scale, appear before the gauge couplings of the Standard Model get unified. The Kaluza-Klein state contribution seems to lead the gauge couplings
Externí odkaz:
http://arxiv.org/abs/hep-ph/0311183
Autor:
Prikas, A., Tracas, N. D.
Publikováno v:
New J.Phys. 5 (2003) 144
We investigate the phase space of parameters in the Pati-Salam model derived in the context of D-branes scenarios, requiring low energy string scale. We find that a non-supersymmetric version complies with a string scale as low as 10 TeV, while in th
Externí odkaz:
http://arxiv.org/abs/hep-ph/0303258
In various supersymmetric extensions of the Standard Model there appear non-topological solitons due to the existence of U(1) global symmetries associated with Baryon and/or Lepton quantum numbers. Trilinear couplings (A-terms) in the scalar potentia
Externí odkaz:
http://arxiv.org/abs/hep-ph/0108032