Early Time Dynamics of Gluon Fields in High Energy Nuclear Collisions
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- 作者：Joseph I. Kapusta
- 关键词：Color glass condensate ; Glasma ; Flow fields
- 刊名：Nuclear Physics A
- 出版年：2016
- 出版时间：December 2016
- 年：2016
- 卷：956
- 期：Complete
- 页码：553-556
- 全文大小：434 K
文摘
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 id="mmlsi1" class="mathmlsrc">ixSupport mathImg" data-mathURL="/science?_ob=MathURL&_method=retrieve&_eid=1-s2.0-S0375947416000233&_mathId=si1.gif&_user=111111111&_pii=S0375947416000233&_rdoc=1&_issn=03759474&md5=4de7e6164701f2f187286d9d52d129c6" title="Click to view the MathML source">τ<1/Qsiner hidden">. 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.