Early Time Dynamics of Gluon Fields in High Energy Nuclear Collisions Academic Article uri icon


  • 2016 Elsevier B.V. Nuclei colliding at very high energy create a strong, quasi-classical gluon field during the initial phase of their interaction. We present an analytic calculation of the initial space-time evolution of this field in the limit of very high energies using a formal recursive solution of the Yang-Mills equations. We provide analytic expressions for the initial chromo-electric and chromo-magnetic fields and for their energy-momentum tensor. In particular, we discuss event-averaged results for energy density and energy flow as well as for longitudinal and transverse pressure of this system. Our results are generally applicable if <1/Qs. The transverse energy flow of the gluon field exhibits hydrodynamic-like contributions that follow transverse gradients of the energy density. In addition, a rapidity-odd energy flow also emerges from the non-abelian analog of Gauss' Law and generates non-vanishing angular momentum of the field. We will discuss the space-time picture that emerges from our analysis and its implications for observables in heavy ion collisions.

published proceedings


altmetric score

  • 0.5

author list (cited authors)

  • Kapusta, J. I., Chen, G., Fries, R. J., & Li, Y.

citation count

  • 2

complete list of authors

  • Kapusta, Joseph I||Chen, Guangyao||Fries, Rainer J||Li, Yang

publication date

  • January 2016