Equilibration and freeze-out of an expanding gas in a transport approach in a Friedmann–Robertson–Walker metric
- 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.
Author: | Joseph Tindall, Juan M. Torres-RinconORCiDGND, Jean-Bernard RoseORCiDGND, Hannah PetersenORCiDGND |
---|---|
URN: | urn:nbn:de:hebis:30:3-546673 |
DOI: | https://doi.org/10.1016/j.physletb.2017.04.080 |
ISSN: | 1873-2445 |
ISSN: | 0370-2693 |
Parent Title (English): | Physics Letters B |
Publisher: | Elsevier |
Place of publication: | Amsterdam |
Document Type: | Article |
Language: | English |
Date of Publication (online): | 2017/05/10 |
Date of first Publication: | 2017/05/10 |
Publishing Institution: | Universitätsbibliothek Johann Christian Senckenberg |
Release Date: | 2020/05/15 |
Tag: | Boltzmann equation; FRW spacetime; Freeze-out; Transport model for heavy-ion collisions |
Volume: | 770.2017 |
Page Number: | 7 |
First Page: | 532 |
Last Page: | 538 |
HeBIS-PPN: | 465577784 |
Institutes: | Physik / Physik |
Wissenschaftliche Zentren und koordinierte Programme / Frankfurt Institute for Advanced Studies (FIAS) | |
Dewey Decimal Classification: | 5 Naturwissenschaften und Mathematik / 53 Physik / 530 Physik |
Sammlungen: | Universitätspublikationen |
Licence (German): | Creative Commons - Namensnennung 4.0 |