Conveners
Parallel Session PI.4
- Yifan Chen
At high energies, such as during inflation, the quartic coupling of the Standard Model (SM) Higgs potential runs negative, according to current measurements. This can lead the potential into a tachyonic regime, where the square of the mass of the SM Higgs becomes negative. This tachyonic instability can exponentially enhance Higgs particle production via Hubble-induced effects and via the...
I examine one-loop corrections from small-scale curvature perturbations to the superhorizon-limit ones in single-field inflation models, which have recently caused controversy. I consider the case where the Universe experiences transitions of slow-roll (SR) → intermediate period → SR. The intermediate period can be an ultra-slow-roll period or a resonant amplification period, either of which...
We study natural inflation in the low energy (two-derivative) metric-affine theory containing only the minimal degrees of freedom in the inflationary sector, i.e. the massless graviton and the pseudo-Nambu-Goldstone boson (PNGB). This theory contains the Ricci-like and parity-odd Holst invariants together with non-minimal couplings between the PNGB and the above-mentioned invariants. The...
Higgs inflation stands out among many possible inflationary models for its minimal character, not requiring any extra degrees of freedom beyond the Standard Model. Nonetheless, the inflationary predictions, as well as the post-inflationary dynamics, are sensitive to the formulation of gravity one uses.
In this work, we study the preheating phase of Higgs Inflation in Einstein-Cartan...
