Statistical Mechanics in an Expanding Maximally Symmetric Universe
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Date
2012-03
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Addis Ababa University
Abstract
The universe was radiation dominated at red shifts higher than Zeq = 3:9x104
h2. In the
radiation dominated phase, the temperature will be greater Teq = 9:2
h2eV and will be
increasing as (1 + Z). As we go to earlier than phases of the universe the radiation will
produce particle-antiparticle pairs of di erent kinds. These elementary particles will be
interacting with each other via di erent processes which will try to maintain statistical
equilibrium between the particles. In order to study the early phases of the universe, one
would like to understand how the material content of the universe changes as it expands
Description
Keywords
Statistical Mechanics