Neutrinos have shaped cosmic history in important ways. In early epochs, they left their mark on the expansion of the universe and the genesis of primordial nuclei. In more recent eras, their signature has been repeatedly etched into the explosive dynamics of massive stars and t…
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Spanning the Universe's history from its first moments to the present, this dissertation covers most of the Universe's history and the bulk of its constituents. With the most basic properties of neutrinos still not well understood, the neutrino sector may harbor yet undiscovered…
This thesis has two parts with different topics in particle physics. In part I, we consider various linear sigma models and their applications to scalar mesons. It is shown that the tree amplitude for ππ scattering in the minimal linear sigma model has an exact expression which …