4 papers
Universal Non-Gaussian Signatures from Transient Instabilities
Shuntaro Aoki, Diederik Roest, Denis Werth
We identify universal signatures in the bispectrum arising from a transient tachyonic instability of entropic fluctuations during inflation, a phenomenon that naturally arises in h…
Heavy Field Effects on Inflationary Models in Light of ACT Data
Shuntaro Aoki, Hajime Otsuka, Ryota Yanagita
Recent results from the Atacama Cosmology Telescope (ACT), when combined with Planck and DESI datasets, indicate a scalar spectral index larger than that reported in the Plan…
Inflationary constraints on the moduli-dependent species scale in modular invariant theories
Shuntaro Aoki, Hajime Otsuka
We demonstrate that a broad class of modular inflation models predicts the emergence of new physics within an energy range of approximately \( 10^{15} \, \mathrm{GeV} \) to \( 10^{…
Higgs-Modular Inflation
Shuntaro Aoki, Hajime Otsuka, Ryota Yanagita
We investigate the role of the Higgs field as a fundamental scalar in the Standard Model within the framework of modular inflation models, where a modulus field acts as the inflato…