TY  - JOUR
A1  - Tindall, Joseph
A1  - Torres-Rincon, Juan M.
A1  - Rose, Jean-Bernard
A1  - Petersen, Hannah
T1  - Equilibration and freeze-out of an expanding gas in a transport approach in a Friedmann–Robertson–Walker metric
T2  - Physics Letters B
N2  - Motivated by a recent finding of an exact solution of the relativistic Boltzmann equation in a Friedmann–Robertson–Walker spacetime, we implement this metric into the newly developed transport approach Simulating Many Accelerated Strongly-interacting Hadrons (SMASH). We study the numerical solution of the transport equation and compare it to this exact solution for massless particles. We also compare a different initial condition, for which the transport equation can be independently solved numerically. Very nice agreement is observed in both cases. Having passed these checks for the SMASH code, we study a gas of massive particles within the same spacetime, where the particle decoupling is forced by the Hubble expansion. In this simple scenario we present an analysis of the freeze-out times, as function of the masses and cross sections of the particles. The results might be of interest for their potential application to relativistic heavy-ion collisions, for the characterization of the freeze-out process in terms of hadron properties.
KW  - Boltzmann equation
KW  - Transport model for heavy-ion collisions
KW  - FRW spacetime
KW  - Freeze-out
Y1  - 2017
UR  - http://publikationen.ub.uni-frankfurt.de/frontdoor/index/index/docId/54667
UR  - https://nbn-resolving.org/urn:nbn:de:hebis:30:3-546673
SN  - 1873-2445
SN  - 0370-2693
VL  - 770.2017
SP  - 532
EP  - 538
PB  - Elsevier
CY  - Amsterdam
ER  -