PIRSA:22110045 Scientific Series Cosmology Particle Physics

DOI10.48660/22110045

Series: Particle Physics

Mirbabayi, M. (2022). Shapes of non-Gaussianity in warm inflation. Perimeter Institute. https://pirsa.org/22110045

Mirbabayi, Mehrdad. Shapes of non-Gaussianity in warm inflation. Perimeter Institute, Nov. 29, 2022, https://pirsa.org/22110045 

@misc{ pirsa_PIRSA:22110045,
  doi = {10.48660/22110045},
  url = {https://pirsa.org/22110045},
  author = {Mirbabayi, Mehrdad},
  keywords = {Cosmology, Particle Physics},
  language = {en},
  title = {Shapes of non-Gaussianity in warm inflation},
  publisher = {Perimeter Institute},
  year = {2022},
  month = {nov},
  note = {PIRSA:22110045 see, \url{https://pirsa.org}}
}

Abstract

Sphaleron heating has been recently proposed as a mechanism to realize warm inflation when inflaton is an axion coupled to pure Yang-Mills. As a result of heating, there is a friction coefficient γ\propto T^3 in the equation of motion for the inflaton, and a thermal contribution to cosmological fluctuations. Without the knowledge of the inflaton potential, non-Gaussianity is the most promising way of searching for the signatures of this model. Building on an earlier work by Bastero-Gil, Berera, Moss and Ramos, we compute the scalar three-point correlation function and point out some distinct features in the squeezed and folded limits. As a detection strategy, we show that the combination of the equilateral template and one new template has a large overlap with the shape of non-Gaussianity over the range 0.01 <= γ/Η <= 1000 and in this range 0.7<|f_NL|<50.

Zoom link:  https://pitp.zoom.us/j/95921707772?pwd=NUNhU1QrRm5HaDJNMEYyaTJXQmZnQT09

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