47 citations · 272 across the 43 of their papers we have counts for
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Temperature Dependence of the Neutron Lifespan
Cheng Tao Yang, Jeremiah Birrell, Johann Rafelski
Current precision big bang nucleosynthesis (BBN) studies motivate us to revisit the neutron lifespan in the plasma medium of the early universe. The mechanism we explore is the Fer…
Non-Equilibrium Aspects of Relic Neutrinos: From Freeze-out to the Present Day
Jeremiah Birrell
In this dissertation, we study the evolution and properties of the relic (or cosmic) neutrino distribution from neutrino freeze-out at MeV through the free-streaming era u…
Relic Neutrino Freeze-out: Dependence on Natural Constants
Jeremiah Birrell, Cheng-Tao Yang, Johann Rafelski
Analysis of cosmic microwave background radiation fluctuations favors an effective number of neutrinos, . This motivates a reinvestigation of the neutrino freeze-out process…
Quark-Gluon Plasma as the Possible Source of Cosmological Dark Radiation
Jeremiah Birrell, Johann Rafelski
The effective number of neutrinos, , obtained from CMB fluctuations accounts for all effectively massless degrees of freedom present in the Universe, including but…
Traveling Through the Universe: Back in Time to the Quark-Gluon Plasma Era
Johann Rafelski, Jeremiah Birrell
We survey the early history of the discovery of quark gluon plasma and the early history of the Universe, beginning with the present day and reaching deep into QGP and almost beyon…