N=2→0 super no-scale models and moduli quantum stability
N=2→0 super no-scale models and moduli quantum stability
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N=2→0 超无标度模型和模量量子稳定性
DOI：
10.1016/j.nuclphysb.2017.03.011
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发表时间：
2017
期刊：
影响因子：
--
通讯作者：
H. Partouche
中科院分区：
文献类型：
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作者：
C. Kounnas;H. Partouche
考虑一类杂种优势N= 2→ 0的超无标度Z2-orbifold模型.一个适当的弦Scherk-Schwarz超对称破缺诱导树水平质量的扭曲超多重态的所有无质量玻色子，因此稳定所有的扭曲模量。在高的超对称破缺尺度下，N= 4→ 0的母理论中的快子被投影出来，而在N= 2→ 0的模型中（对于足够小的边缘形变），没有Hagedorn型不稳定性发生。在低超对称破缺尺度下，考虑了非扭曲和扭曲对单圈有效势的贡献，在量子水平上研究了非扭曲模量的稳定性。后者取决于规范理论的特定分支，背景可以沿着该分支沿着变形。我们推导出它的表达式中的所有经典的边缘变形在纯库仑相，并在一些混合库仑/希格斯相位。在这类模型中，超无标度条件要求在无质量水平上具有相等数量的无扭曲玻色子自由度和扭曲费米子自由度。最后，我们证明了N= 1→ 0的超无标度模型是通过对N= 2→ 0的超无标度Z2-orbifold模型进行第二次Z2-orbifold扭曲而得到的.
We consider a class of heterotic N= 2→ 0 super no-scale Z 2-orbifold models. An appropriate stringy Scherk–Schwarz supersymmetry breaking induces tree level masses to all massless bosons of the twisted hypermultiplets and therefore stabilizes all twisted moduli. At high supersymmetry breaking scale, the tachyons that occur in the N= 4→ 0 parent theories are projected out, and no Hagedorn-like instability takes place in the N= 2→ 0 models (for small enough marginal deformations). At low supersymmetry breaking scale, the stability of the untwisted moduli is studied at the quantum level by taking into account both untwisted and twisted contributions to the 1-loop effective potential. The latter depends on the specific branch of the gauge theory along which the background can be deformed. We derive its expression in terms of all classical marginal deformations in the pure Coulomb phase, and in some mixed Coulomb/Higgs phases. In this class of models, the super no-scale condition requires having at the massless level equal numbers of untwisted bosonic and twisted fermionic degrees of freedom. Finally, we show that N= 1→ 0 super no-scale models are obtained by implementing a second Z 2 orbifold twist on N= 2→ 0 super no-scale Z 2-orbifold models.