2022-04-18

UTAPwiki/セミナー/初期宇宙・相対論速報

Title: tail structure of primordial perturbations and implications for primordial black holes †

Speaker: Koki Tokeshi †

Primordial curvature perturbations are known to be nearly Gaussian according to the large scale observations.
However, it does not necessarily mean that at much smaller scales they are also Gaussian distributed.
Indeed, one can see that these tails are highly non-Gaussian making use of the framework of stochastic inflation.
Since primordial black holes could be generated from the tail of the distribution, it is expected that this modification affects the pbh abundance.
In particular, the distribution decays exponentially and hence the abundance is predicted to increase by several or many orders.

[1] C. Pattison, V. Vennin, H. Assadullahi, and D. Wands, JCAP 10 (2017) 046 [hep-th/1707.00537]
[2] J. M. Ezquiaga, J. Garcia-Bellido, and V. Vennin, JCAP 03 (2020) 029 [astro-ph.CO/1912.05399]