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It is well-known that the non-supersymmetric D3 brane (a cousin of BPS D3brane) including its black version of type IIB string theory has a decouplinglimit, where the decoupled geometry is the gravity dual of anon-supersymmetric, non-conformal (finite temperature) quantum field theoryhaving some properties similar to QCD. Using the ideas of AdS/CFT we study somenon-perturbative aspects of this quantum field theory. Since in this case wehave a Yang-Mills theory (no quarks) with running coupling (non-constantdilaton), we compute the gluon condensate in this theory as a function oftemperature and also compute the beta function. The behavior of the gluoncondensate is found to resemble much like the SU(3) lattice QCD result and thebeta function is found to be negative. We further compute both the pseudoscalarand the scalar glueball mass spectra in this theory using WKB approximation andfind that the mass ratios of the first excited state to the ground state of thescalar glueball are quite close to the lattice QCD results.

Some aspects of non-perturbative QCD from non-susy D3 brane of Type IIB string theory