| 研究実績の概要 |
In the entire period of this program JP20K14461, I completed 13 papers (10 published, 3 in submission). Here is a summary of some representitive works.
1. Pi and Sasaki, Phys.Rev.Lett. 131 (2023) 1, 011002. We found a fully nonlinear expression for the curvature perturbation in single-field inflation models, which is very helpful in determining its statistical properties.
2. Cai, Pi, and Sasaki, Phys.Rev.D 102 (2020) 8, 083528. We show that under some general conditions, the GW spectra, no matter what sources they come from, has an universal infrared f^3 scaling.
3. Demenech and Pi, Sci.China Phys.Mech.Astron. 65 (2022) 3, 230411. We show that the nHz GW signal observed by pulsar timing arrays (NANOGrav, etc.) could indicate the presense of planet-mass PBHs.
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