We study torus/orbifold models with magnetic flux and Wilson line backgrounds. The number of zero modes their profiles depend on those That has interesting implications from the viewpoint particle phenomenology.

A bstract We study two-dimensional de Sitter universe which evolves and proliferates according to the Ginsparg-Perry-Bousso-Hawking mechanism, using Jackiw-Teitelboim gravity coupled conformal matter. Black holes are generated by quantum effects from pure space then evaporate yield multiple disjoint spaces. The back-reaction matter CFT is taken into account for dilaton as a function of temperature CFT. discuss evaporation black calculate finite entropy an inflating region island formula....

We study the flavor structure of 4D effective theories, which are derived from extra dimensional theories with magnetic fluxes and non-Abelian Wilson lines. zero-mode wavefunctions compute Yukawa couplings as well four-point couplings. In our models, we also discuss discrete symmetries such $D_4$, $\Delta(27)$ $\Delta(54)$.

We show that, without any extra physical degree introduced, the standard model can be readily reformulated as a double field theory. Consequently, couple to an arbitrary stringy gravitational background in O(4,4) T-duality covariant manner and manifest two independent local Lorentz symmetries, Spin(1,3)×Spin(3,1). While diagonal gauge fixing of twofold spin groups leads conventional formulation on flat Minkowskian background, enhanced symmetry makes more rigid, also stringy, than it...

Anomalies of discrete $R$ symmetries appearing in heterotic orbifold models are studied. We find that the mixed anomalies for different gauge groups satisfy universal Green-Schwarz condition, indicating these canceled by mechanism. An exact relation between anomaly coefficients and one-loop beta-function is obtained. also have a good chance to be unbroken down supersymmetry breaking scale. Even below this scale ${Z}_{2}$ subgroup unbroken, it may an origin parity minimal supersymmetric...

A $Z_3$ orbifold compactification of $E_8\times E_8^\prime$ heterotic string is considered toward a trinification $SU(3)^3$ with three light families. The GUT scale VEV's the $SU(2)_W\times U(1)_Y\times SU(3)_c$ singlet chiral fields in two sets spectrum allow an acceptable symmetry breaking pattern MSSM. We show that doublet-triplet splitting related to absence $\Delta B$ nonzero operator.

We study non-Abelian flavor symmetries on orbifolds, $S^1/Z_2$ and $T^2/Z_3$. Our extra dimensional models realize $D_N$, $\Sigma(2N^2)$, $\Delta(3N^2)$ $\Delta(6N^2)$ including $A_4$ $S_4$. In addition, one can also their subgroups such as $Q_N$, $T_7$, etc. The $S_3$ symmetry be realized both $T^2/Z_3$ orbifolds.

A numerical study of interior flat plate–column connections subjected to unbalanced moments was performed by using nonlinear finite element analysis. The distribution and strength the eccentric shear flexural moment that develop at were studied. results showed stress different from those specified in current design codes, significantly affected acting same critical section. Based on findings, an improved method for developed verified comparisons with existing test results. These proposed...

We obtain a supersymmetric three family chiral SU(6) grand unification model with the global symmetry SU(3)[family] from F-theory. This has nice features such as all fermion masses are reasonably generated and there results only one pair of Higgs doublets, realizing doublet-triplet splitting SU(3)[family]. The proton hexality is realized toward stability problem. There room to fit gauge couplings using F-theory flux idea we lifetime in 10^{36-37} yr region.

Using E-strings, we can analyze not only six-dimensional superconformal field theories but also probe vacua of non-perturabative heterotic string. We study strings made D3-branes wrapped on various two-cycles in the global F-theory setup. claim that E-strings are elementary sense combinations form M-strings as well and new kind strings, called G-strings. them, show emissions small instantons generate most known theories, their affinizations little string theories. Taking account structure...

We perform post-Newtonian analysis of double field theory as a test string in gravitational sector against observations. identify the Eddington-Robertson-Schiff parameters β_{PPN}, γ_{PPN} with charges electric H flux and dilaton respectively, further relate them to stress-energy tensor. show β_{PPN}=1 from weak energy condition argue that observation γ_{PPN}≃1 signifies ultrarelativistic equation state baryons, or suppression gluon condensate.