Bahar Nikbakht

School of Astronomy, Institute for Research in Fundamental Sciences (IPM)

Non-Gaussianity consistency relations and their consequences for the peaks

 

Abstract: Strong deviations from scale invariance and the appearance of high peaks in the primordial power spectrum have been extensively studied for generating primordial black holes (PBHs) or gravitational waves (GWs). It is also well-known that the effect of non-linearities can be significant in both phenomena. In this study, we introduce a general single-field consistency relation that relates the amplitude of non-Gaussianity in the squeezed limit  to the power spectrum and remains valid when almost all other consistency relations are violated.

Then we discuss the general and model-independent consequences of the consistency relation on the behavior of  at different scales.

As an implication of our results, we argue that non-linearities can shift or extend the range of scales responsible for the production of PBHs or GWs, relative to the window as determined by the largest peak of the power spectrum, and may also open up new windows for both phenomena.

یکشنبه 26 فروردین 1403، ساعت 17:00

Sunday 14 April 2024 – 17:00 Tehran Time

Hybrid Seminar

دانشکده فیزیک – طبقه اول – کلاس فیزیک 3 /Physics Department – first floor – Room Physics 3   

https://vc.sharif.edu/ch/cosmology

گزینه ورود به صورت مهمان – Enter as a Guest