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5 papers · 2 filters
Big bang nucleosynthesis and early dark energy in light of the EMPRESS results and the tension
Tomo Takahashi, Sora Yamashita
Recent measurement of the primordial He abundance from EMPRESS suggests a cosmological scenario with the effective number of neutrino species deviated from the standard v…
Skewness consistency relation in large-scale structure and test of gravity theory
Daisuke Yamauchi, Shoya Ishimaru, Takahiko Matsubara +1
We investigate the skewness of galaxy number density fluctuations as a possible probe to test gravity theories. We find that the specific linear combination of the skewness paramet…
Multi-chaotic inflation with and without spectator field
Yukiyoshi Morishita, Tomo Takahashi, Shuichiro Yokoyama
Motivated by the result of Planck+BICEP/Keck recently released, we investigate the consistency of the multi-field inflation models in terms of the spectral index and the tens…
Non-minimally assisted chaotic inflation
Sang Chul Hyun, Jinsu Kim, Seong Chan Park +1
Conventional wisdom says that a chaotic inflation model with a power-law potential is ruled out by the recent Planck-BICEP/Keck results. We find, however, that the model can be ass…
Double inflation via non-minimally coupled spectator
Mio Kubota, Kin-ya Oda, Stanislav Rusak +1
We argue that double inflation may occur when a spectator field is non-minimally coupled to gravity. As a concrete example, we study a two-field inflationary model where the initia…