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Non-critical string theory
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<p>The non-critical string theory describes the relativistic string without enforcing the critical dimension. Although this allows the construction of a string theory in 4 spacetime dimensions, such a theory usually does not describe a Lorentz invariant background. However, there are recent developments which make possible <a href="/facts/Non-critical_string_theory%3a_Lorentz_invariance/evmV3Cg3">Lorentz invariant quantization</a> of string theory in 4-dimensional Minkowski space-time. </p><p>There are several applications of the non-critical string. Through the <a href="/facts/AdS%2fCFT_correspondence/8Ide9C9m">AdS/CFT correspondence</a> it provides a holographic description of gauge theories which are asymptotically free. It may then have applications to the study of the <a href="/facts/Quantum_chromodynamics/3cA2ctyb">QCD</a>, the theory of strong interactions between <a href="/facts/Quarks/hwuuVkV5">quarks</a>. </p>