Self-interacting QCD strings and string balls

Understand

Strings at T ~ T_c are known to be subject to the so-called Hagedorn phenomenon, in which a string's entropy (times T) and energy cancel each other and result in the evolution of the string into highly excited states, or "string balls".

• Intrinsic attractive interaction of strings -- gravitational for fundamental strings or in the context of holographic models of the AdS/QCD type, or sigma exchanges for QCD strings -- can significantly modify properties of the string balls.
• If heavy enough, those start approaching properties of the black holes.
• We generate self-interacting string balls numerically, in a thermal string lattice model.