Eur. Phys. J. A (2005) 25: 65-73
https://doi.org/10.1140/epja/i2004-10251-1

Original Article

Modified Boltzmann Transport Equation and Freeze Out

¹ Section for Theoretical and Computational Physics, and Bergen Computational Physics Laboratory, BCCS-Unifob, University of Bergen, Allegaten 55, 5007, Bergen, Norway
² Research Institute of Particle and Nuclear Physics, MTA-KFKI, P.O. Box 49, H-1525, Budapest, Hungary
³ Departamento de Fısica Teórica and IFIC Centro Mixto, Universidad de Valencia-CSIC, Institutos de Investigación de Paterna, Apdo. correos 22085, 46071, Valencia, Spain

^* e-mail: Karolis.Tamosiunas@ift.uib.no

Received: 17 August 2004
Accepted: 2 May 2005
Published online: 22 July 2005

Abstract

We study the Freeze-Out process in high-energy heavy-ion reaction. The description of the process is based on the Boltzmann Transport Equation (BTE). We point out the basic limitations of the BTE approach and introduce the Modified BTE. The Freeze-Out dynamics is presented in the 4-dimensional space-time in a layer of finite thickness, and we employ the Modified BTE for the realistic Freeze-Out description.