851 citations · 5.2k across the 133 of their papers we have counts for
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Relaxing inflation models with non-minimal coupling: A general study
Tatsuki Kodama, Tomo Takahashi
We investigate the predictions of inflation models with a non-minimal coupling to gravity for inflationary observables such as the spectral index and tensor-to-scalar ratio in a ge…
Probing isocurvature perturbations with 21-cm global signal in the light of HERA result
Teppei Minoda, Shintaro Yoshiura, Tomo Takahashi
We argue that the 21-cm global signal can be a powerful probe of isocurvature perturbations, particularly for the ones with blue-tilted spectra. Although the 21-cm global signal is…
Primordial black holes as a probe of strongly first-order electroweak phase transition
Katsuya Hashino, Shinya Kanemura, Tomo Takahashi
Primordial black holes can be produced by density fluctuations generated from delayed vacuum decays of first-order phase transition. The primordial black holes generated at the ele…
Generalized local ansatz for scale-dependent primordial non-Gaussianities and future galaxy surveys
Daisuke Yamauchi, Shuichiro Yokoyama, Tomo Takahashi
We revisit a possible scale-dependence of local-type primordial non-Gaussianities induced by super-horizon evolution of scalar field perturbations. We develop the formulation based…
The -Higgs inflation with two Higgs doublets
Sung Mook Lee, Tanmoy Modak, Kin-ya Oda +1
We study -Higgs inflation in a model with two Higgs doublets in which the Higgs sector of the Standard Model is extended by an additional Higgs doublet, thereby four scalar fi…
tension without CMB data: beyond the CDM
Fumiya Okamatsu, Toyokazu Sekiguchi, Tomo Takahashi
We investigate the tension in a range of extended model frameworks beyond the standard CDM without the data from cosmic microwave background (CMB). Specifically, we adopt…
Angular correlation as a novel probe of supermassive primordial black holes
Takumi Shinohara, Teruaki Suyama, Tomo Takahashi
We investigate the clustering property of primordial black holes (PBHs) in a scenario where PBHs can explain the existence of supermassive black holes (SMBHs) at high redshifts. We…