Speaker
Description
We deepen the understanding of the primordial composition of the Universe in the temperature range $130\,\mathrm{GeV}>T>0.02\,\mathrm{MeV}$ within the Big Bang model. Massive elementary particles: $t,b,c$-quarks, $\tau,\mu$-leptons, and $W, Z$-gauge bosons emerged at about $T=130\,\mathrm{GeV}$. These elementary particles in the following were abundantly present as the Universe expanded and cooled - our interest is to search for periods of possible chemical non-equilibrium of great importance in baryogenesis. Once the temperature dropped below $T=150$\,~MeV quarks and gluons hadronize into matter. We follow the Universe evolution in depth and study near $T=\mathcal{O}(2)$\,~MeV the emergence of the free-streaming neutrino era and develop methods to understand speed of the Universe expansion. We subsequently follow the early universe pass through the hot dense electron-positron plasma epoch and we analyze the paramagnetic characteristics of the electron-positron plasma when exposed to an external primordial magnetic field. The high density of positron antimatter persisted into the Big Bang Nucleosynthesis era which thus requires study of nuclear reactions in the presence of a highly mobile plasma phase, a topic of the following lecture by Chris.
