Kavli Affiliate: Masahiro Takada
| First 5 Authors: Ryo Terasawa, Masahiro Takada, Sunao Sugiyama, Toshiki Kurita,
| Summary:
Different cosmological probes, such as primary cosmic microwave background
(CMB) anisotropies, CMB lensing, and cosmic shear, are sensitive to the
primordial power spectrum (PPS) over different ranges of wavenumbers. In this
paper, we combine the cosmic shear two-point correlation functions measured
from the Subaru Hyper Suprime-Cam (HSC) Year 3 data with the Planck CMB data,
and the ACT DR6 CMB lensing data to test modified shapes of the PPS at small
scales, while fixing the background cosmology to the flat $Lambda$CDM model.
We consider various types of modifications to the PPS shape: the model with a
running spectral index, the tanh-shaped model, the Starobinsky-type
modification due to a sharp change in the inflaton potential, the broken
power-law model, and the multiple broken power-law model. Although the HSC
cosmic shear data is sensitive to the PPS at small scales, we find that the
combined data remains consistent with the standard power-law PPS, i.e., the
single power-law model, for the flat $Lambda$CDM background. In other words,
we conclude that the $S_8$ tension cannot be easily resolved by modifying the
PPS within the $Lambda$CDM background.
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