The subject of gauge/string duality has made rapid strides in recent years. The best known example of this duality is the conjecture that Type II B string theory in AdS5×S5 with N units of R-R five form flux is dual to 𝒩=4 theory in d = 4 with gauge group SU(N). Since then this conjecture has given new insight into both gauge theory and string theory. More recently attempts have been made to expand its reach to include more realistic theories in the same universality class as QCD. Considering the volume of work in the literature, the guest editors are of the opinion that now is an appropriate time to bring out a Special Issue containing articles covering diverse aspects of gauge/string duality. We invite contributions on all aspects of gauge/string duality. As a rough guide, we encourage articles in the following areas:

• Holographic duals of QCD-like theories
• Holographic description of transport phenomena, symmetry breaking, quark-gluon plasma, and phase transitions
• AdS4/CFT3
• Nonrelativistic AdS/CFT. Applications in condensed matter physics
• Holographic models for Cosmology of early Universe
• Integrable structures in AdS/CFT

The submission of review articles describing developments in the past five to six years is highly encouraged, but also original research contributions will be considered.

Before submission authors should carefully read over the journal's Author Guidelines, which are located at http://www.hindawi.com/journals/ahep/guidelines/. Prospective authors should submit an electronic copy of their complete manuscript through the journal Manuscript Tracking System at http://mts.hindawi.com/ according to the following timetable: