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String Theory and Particle Physics by Angel M. Uranga, Luis E. Ibáñez

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17

The space of string vacua

In the preceding chapters we have displayed the wealth of possibilities to build specific 4d string vacua. In this chapter we take a more general viewpoint and present an aerial view of the space of string vacua (at our present level of knowledge), in particular of those corners with low-energy physics resembling closely the SM of particle physics. In spite of the apparent enormous number of consistent vacua, the space of field theories obtainable as low-energy effective descriptions of string theories can be argued to be strongly constrained, forming a minute subset in the space of all possible field theories. We present some of these general properties of string vacua, and then turn to overviewing the status of ...

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