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Tensor Modes in Pure Natural Inflation
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We study tensor modes in pure natural inflation (arXiv:1706.08522), a recently-proposed inflationary model in which an axionic inflaton couples to pure Yang-Mills gauge fields. We find that the tensor-to-scalar ratio r is naturally bounded from below. This bound originates from the finiteness of the number of metastable branches of vacua in pure Yang-Mills theories. Details of the model can be probed by future cosmic microwave background experiments and improved lattice gauge theory calculations of the theta-angle dependence of the vacuum energy.
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Pure Chromo-Natural Inflation: Signatures of Particle Production from Weak to Strong Backreaction
Pure chromo-natural inflation unavoidably transitions from weak to strong backreaction, producing a chiral three-peak gravitational wave spectrum and a scalar peak that can form primordial black holes.
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