Physics – High Energy Physics – High Energy Physics - Theory
Scientific paper
2010-09-28
Physics
High Energy Physics
High Energy Physics - Theory
PhD Thesis. Facultad de Ciencias Exactas. Universidad Nacional de La Plata. (Full text in Spanish)
Scientific paper
In this Thesis, we focus on the study of the low energy approximation to non-critical string theories. We present an exhaustive study of their solutions, which are divided in three cases: vacuum, NSNS charged, and RR charged solutions. In the first case, we find all possible solutions, including the previously known ones, which are special cases of ours. In the second case, we present the fundamental non-critical string, doubly localized in Minkowski \times the cigar vacuum. There are only a few known solutions doubly localized. Also, we completely solve the problem of finding NSNS solutions that fill all the Minkowski space. In the third case, we present new parametric families that contain some of the previously known solutions at particular values of the parameters. For the latter families, we have obtained the gauge duals in the context of the gauge/gravity duality, and we show that, in a particular region of the parameter space, these theories can confine. Finally, we study the obtained YM in D=3 and YM in D=4 theories, and we show the corresponding glueball spectra, that are in very good agreement with those predicted by lattice QCD.
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