47 citations · 145 across the 19 of their papers we have counts for
19 papers
Weinberg Angle, Neutron Abundance in BBN, and Lifetime
Cheng Tao Yang, Johann Rafelski
We present state of the art kinetic theory determination of the neutron abundance available for the Big-Bang nucleosynthesis (BBN). Our work is motivated by the study of the neutro…
Self-consistent strong screening applied to thermonuclear reactions
Christopher Grayson, Cheng Tao Yang, Martin Formanek +1
Self-consistent strong plasma screening around light nuclei is implemented in the Big Bang nucleosynthesis (BBN) epoch to determine the short-range screening potential, $eϕ(r)/T \g…
Fermi-Dirac Integrals in Degenerate Regimes: A Novel Asymptotic Expansion
Jeremiah Birrell, Martin Formanek, Andrew Steinmetz +2
We characterize in a novel manner the physical properties of the low temperature Fermi gas in the degenerate domain as a function of temperature and chemical potential. For the fir…
Elementary Particles and Plasma in the First Hour of the Early Universe
Cheng Tao Yang
This dissertation aims to deepen the understanding of the primordial composition of the Universe in the temperature range 300 MeV>T>0.02 MeV. I exploit known properties of elementa…
Dynamic fermion flavor mixing through transition dipole moments
Johann Rafelski, Andrew Steinmetz, Cheng Tao Yang
We show that Majorana neutrino flavor mixing can be driven by transition dipole moments in the presence of external electromagnetic fields. We demonstrate the sensitivity of the ro…
Electron-positron plasma in BBN: damped-dynamic screening
Christopher Grayson, Cheng Tao Yang, Martin Formanek +1
We characterize in detail the very dense plasma present during the Big-Bang Nucleosynthesis (BBN) and explore how it is perturbed electromagnetically by \lq\lq impuriti…
Matter-antimatter origin of cosmic magnetism
Andrew Steinmetz, Cheng Tao Yang, Johann Rafelski
We explore the hypothesis that the abundant presence of relativistic antimatter (positrons) in the primordial universe is the source of the intergalactic magnetic fields we observe…
A short survey of matter-antimatter evolution in the primordial universe
Johann Rafelski, Jeremiah Birrell, Andrew Steinmetz +1
We offer a survey of the matter-antimatter evolution within the primordial Universe. While the origin of the tiny matter-antimatter asymmetry has remained one of the big questions…
Charm and beauty isolation from heavy flavor decay electrons in p+p and Pb+Pb collisions at = 5.02 TeV at LHC
Dongsheng Li, Fan Si, Yidan Zhao +4
We present an analysis on the heavy flavor hadron decay electrons with charm and beauty contributions decomposed via a data driven method in p+p and Pb+Pb collisions at $\sqrt{s_{\…
Cosmological Strangeness Abundance
Cheng Tao Yang, Johann Rafelski
We investigate the strange particle composition of the early Universe in the hadron epoch \,MeV. We study strangeness yield in thermal and chemical equil…
The muon abundance in the primordial Universe
Jan Rafelski, Cheng Tao Yang
Muon abundance is required for the understanding of several fundamental questions regarding properties of the primordial Universe. In this paper we evaluate the production and deca…
Reactions Governing Strangeness Abundance in Primordial Universe
Johann Rafelski, Cheng Tao Yang
Strangness production processes can balance natural strangeness decay in the early hadronic Universe. Comparing to the characteristic Hubble time , the reaction rates for $μ^\…
Possibility of bottom-catalyzed matter genesis near to primordial QGP hadronization
Cheng Tao Yang, Johann Rafelski
We study bottom flavor abundance in the early Universe near to a temperature , the condition for hadronization of deconfined quark-gluon plasma…
Lepton Number and Expansion of the Universe
Cheng Tao Yang, Jeremiah Birrell, Johann Rafelski
We show that the non-integer effective number of neutrinos can be understood as an effect of lepton asymmetry in the early Universe carried by the Dirac ne…
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…
Strong fields and neutral particle magnetic moment dynamics
Martin Formanek, Stefan Evans, Johann Rafelski +2
Interaction of magnetic moment of point particles with external electromagnetic fields experiences unresolved theoretical and experimental discrepancies. In this work we point out…
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…
Fugacity and Reheating of Primordial Neutrinos
Jeremiah Birrell, Cheng-Tao Yang, Pisin Chen +1
We clarify in a quantitative way the impact that distinct chemical and kinetic freeze-out temperatures have on the reduction of the neutrino fugacity below equili…
Relic neutrinos: Physically consistent treatment of effective number of neutrinos and neutrino mass
Jeremiah Birrell, Cheng-Tao Yang, Pisin Chen +1
We perform a model independent study of the neutrino momentum distribution at freeze-out, treating the freeze-out temperature as a free parameter. Our results imply that measuremen…