کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
5494885 1528786 2017 7 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Equilibration and freeze-out of an expanding gas in a transport approach in a Friedmann-Robertson-Walker metric
ترجمه فارسی عنوان
تعادل و فریز کردن یک گاز در حال رشد در رویکرد حمل و نقل در متریک فریدمن-روبرتسون-واکر
موضوعات مرتبط
مهندسی و علوم پایه فیزیک و نجوم فیزیک هسته ای و انرژی بالا
چکیده انگلیسی
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.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Physics Letters B - Volume 770, 10 July 2017, Pages 532-538
نویسندگان
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