Lattice simulation of multi-stream inflation

@article{Cai2022LatticeSO,
  title={Lattice simulation of multi-stream inflation},
  author={Tingqi Cai and J. Jiang and Yi Wang},
  journal={Journal of Cosmology and Astroparticle Physics},
  year={2022},
  volume={2022}
}
We present the first lattice simulation to investigate the nature of multi-stream inflation. The simulation confirms the physical picture of multi-stream inflation, and with new findings in parameter space and field behaviors. Our simulation shows that gradient energy plays a significant role in multi-stream inflation. For a double field potential with a shifted Gaussian barrier, bifurcation probability is controlled by the shift distance with an error function relation. The bubbles created by… 
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Cosmological Standard Timers from Unstable Primordial Relics
Yi-Fu Cai, 2, ∗ Chao Chen, † Qianhang Ding, 3, ‡ and Yi Wang 3, § Department of Astronomy, School of Physical Sciences, University of Science and Technology of China, Hefei, Anhui 230026, China CAS…
Lattice Simulations of Abelian Gauge Fields coupled to Axion during Inflation
TLDR
This work uses a non-linear lattice simulation to study a model of axion inflation where the inflaton is coupled to a U(1) gauge field through Chern-Simons interaction and identifies a discretization scheme for which the growth of the gauge field on the lattice reproduces the one of continuous space with good precision.

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