@article{aff263ca8851487897b0072d479fe900,

title = "N = 1 superstrings with spontaneously broken symmetries",

abstract = "We construct N = 1 chiral superstrings with spontaneously broken gauge symmetry in four space-time dimensions. These new string solutions are obtained by a generalized coordinate-dependent Z2 orbifold compactification of some non-chiral five-dimensional N = 1 and N = 2 superstrings. The scale of symmetry breaking is arbitrary (at least classically) and it can be chosen hierarchically smaller than the string scale (α′)- 1 2.",

author = "Sergio Ferrara and Costas Kounnas and Massimo Porrati",

note = "Funding Information: This is a major obstruction for the application of this mechanism to realistic models with chiral families which allow the presence of N= 1 supersymmetry at most. However, this can be avoided by a suitable twist of the extra (fifth) dimension. In the present note we show that by using twisted boundary conditions for the fifth coordinate (Z2-orbifold compactification) [ 6,7 ] we introduce a suitable projection which reduces the number of su- ¢r This work was supported in part by the Director, Office of Energy Research Office of High Energy and Nuclear Physics, Division of High Energy Physics of US Department of Energy under Contract DE-AC03-76SF00098 and in part by DOE under Grant No. DE-AA03-76SF00034 and the National Science Foundation under Research Grant Nos. PHY85-15857 and PHY81-18547. ~j Notice that this way of coupling gauge fields does not change the value of the central charge of the model, and therefore does not introduce extra 2D degrees of freedom, as it happens instead in a previous model by the author ofref. [4].",

year = "1988",

month = may,

day = "12",

doi = "10.1016/0370-2693(88)91257-9",

language = "English (US)",

volume = "206",

pages = "25--31",

journal = "Physics Letters B",

issn = "0370-2693",

publisher = "Elsevier",

number = "1",

}