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TASI Lectures on Early Universe Cosmology: Inflation, Baryogenesis and Dark Matter
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These lectures, presented at TASI 2018, provide a concise introduction to inflation, baryogenesis, and aspects of dark matter not covered by the other lectures. The emphasis for inflation is an intuitive understanding and techniques for constraining inflationary models. For baryogenesis we focus on two examples, leptogenesis and electroweak baryogenesis, with attention to singlet-assisted two-step phase transitions. Concerning dark matter, we review different classes of models distinguished by their mechanisms for obtaining the observed relic density, including thermal freeze-out, asymmetric dark matter, freeze-in, SIMP dark matter, the misalignment mechanism for ultralight scalars and axions, and production of primordial black holes during inflation. Problem sets are provided.
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Dark Photons from Perturbative Decay of a Misaligned Higgs Field
Stochastically misaligned dark Higgs decay into dark photons can make all the dark matter for m_A′ ≈ 100 eV–1 GeV and g ≈ 10^-15–10^-10, shrinking to 10 keV–1 MeV with one-loop kinetic mixing.
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