Non-tachyonic semi-realistic non-supersymmetric heterotic-string vacua
Non-tachyonic semi-realistic non-supersymmetric heterotic-string vacua
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非快子半实在非超对称异质弦真空
DOI:
10.1140/epjc/s10052-016-4056-2
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发表时间:
2016
期刊:
影响因子:
--
通讯作者:
Ashfaque J
中科院分区:
文献类型:
--
作者:
Ashfaque J
The heterotic-string models in the free fermionic formulation gave rise to some of the most realistic-string models to date, which possessspacetime supersymmetry. Lack of evidence for supersymmetry at the LHC instigated recent interest in non-supersymmetric heterotic-string vacua. We explore what may be learned in this context from the quasi-realistic free fermionic models. We show that constructions with a low number of families give rise to proliferation of a priori tachyon producing sectors, compared to the non-realistic examples, which typically may contain only one such sector. The reason being that in the realistic cases the internal six dimensional space is fragmented into smaller units. We present one example of a quasi-realistic, non-supersymmetric, non-tachyonic, heterotic-string vacuum and compare the structure of its massless spectrum to the corresponding supersymmetric vacuum. While in some sectors supersymmetry is broken explicitly, i.e. the bosonic and fermionic sectors produce massless and massive states, other sectors, and in particular those leading to the chiral families, continue to exhibit Fermi–Bose degeneracy. In these sectors the massless spectrum, as compared to the supersymmetric cases, will only differ in some local or globalU(1) charges. We discuss the conditions for obtainingat the massless level in these models. Our example model contains an anomalousU(1) symmetry, which generates a tadpole diagram at one-loop order in string perturbation theory. We speculate that this tadpole diagram may cancel the corresponding diagram generated by the one-loop non-vanishing vacuum energy and that in this respect the supersymmetric and non-supersymmetric vacua should be regarded on an equal footing. Finally we discuss vacua that contain two supersymmetry generating sectors.
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DOI:
10.1016/j.nuclphysb.2015.08.001
发表时间:
2014
期刊:
Nuclear Physics
影响因子:
--
作者:
A. Faraggi;C. Kounnas;H. Partouche
通讯作者:
H. Partouche
DOI:
10.1016/s0550-3213(99)00135-2
发表时间:
1999
期刊:
arXiv: High Energy Physics - Theory
影响因子:
--
作者:
A. Gregori;C. Kounnas;J. Rizos
通讯作者:
J. Rizos
DOI:
10.1016/0550-3213(91)90321-n
发表时间:
1991
期刊:
Nuclear Physics
影响因子:
--
作者:
S. Kalara;J. L. Lopez;D. Nanopoulos
通讯作者:
D. Nanopoulos
DOI:
10.1016/j.nuclphysb.2007.03.029
发表时间:
2006
期刊:
Nuclear Physics
影响因子:
--
作者:
A. Faraggi;C. Kounnas;J. Rizos
通讯作者:
J. Rizos
DOI:
10.1016/0550-3213(87)90371-3
发表时间:
1987
期刊:
Nuclear Physics
影响因子:
--
作者:
J. Bagger;D. Nemeschansky;N. Seiberg;S. Yankielowicz
通讯作者:
S. Yankielowicz