论文标题
键入$ \ MATHBF {\ bar {0}} $杂种字符串orbifolds
Type $\mathbf{\bar{0}}$ Heterotic String Orbifolds
论文作者
论文摘要
$ z_2 \ times z_2 $异源弦乐器呈Orbifold产生了很大的现象学三代模型，该模型是探索如何将标准粒子物理模型纳入量子重力理论中的测试场。最近，我们证明了类型为0 $ z_2 \ times z_2 $异源字符串Orbifolds的存在，其中没有无质量的费米子状态。在本文中，我们证明了非苏匹马对称tachyon的存在 - 无$ z_2 \ times z_2 $异源弦乐孔orbifolds，不包含来自扭曲扇区的任何无质量的骨状状态。我们配音这些配置类型$ {\ bar 0} $模型。它们必然包含不WIST的骨状状态，产生引力，量规和标量模量自由度，但具有超过骨气状态的无质量典型状态，因此产生了积极的宇宙常数。在尝试理解早期宇宙中的字符串动力学时，这种配置可能是有工具性的。
The $Z_2\times Z_2$ heterotic string orbifold gives rise to a large space of phenomenological three generation models that serves as a testing ground to explore how the Standard Model of particle physics may be incorporated in a theory of quantum gravity. Recently, we demonstrated the existence of type 0 $Z_2\times Z_2$ heterotic string orbifolds in which there are no massless fermionic states. In this paper we demonstrate the existence of non--supersymmetric tachyon--free $Z_2\times Z_2$ heterotic string orbifolds that do not contain any massless bosonic states from the twisted sectors. We dub these configurations type ${\bar 0}$ models. They necessarily contain untwisted bosonic states, producing the gravitational, gauge and scalar moduli degrees of freedom, but possess an excess of massless fermionic states over bosonic ones, hence producing a positive cosmological constant. Such configurations may be instrumental when trying to understand the string dynamics in the early universe.
