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Constraints on the Primordial Magnetic Field from
Dai G. Yamazaki, Kiyotomo Ichiki, Toshitaka Kajino +1
A primordial magnetic field (PMF) can affect the evolution of density field fluctuations in the early universe.In this paper we constrain the PMF amplitude and power spectral…
Constraints on Neutrino Masses from Weak Lensing
Kiyotomo Ichiki, Masahiro Takada, Tomo Takahashi
The weak lensing (WL) distortions of distant galaxy images are sensitive to neutrino masses by probing the suppression effect on clustering strengths of total matter in large-scale…
Detectability of Pair Echos from Gamma-Ray Bursts and Intergalactic Magnetic Fields
Keitaro Takahashi, Kohta Murase, Kiyotomo Ichiki +2
High-energy emission from gamma-ray bursts (GRBs) can give rise to pair echos, i.e. delayed inverse Compton emission from secondary pairs produced in interactions w…
Neutrino mass effects on vector and tensor CMB anisotropies in the presence of a primordial magnetic field
Kazuhiko Kojima, Kiyotomo Ichiki, Dai G. Yamazaki +2
If a primordial magnetic field (PMF) is present during photon decoupling and afterward, a finite neutrino mass can affect all modes of the CMB. In this work, we expand on earlier s…
Cosmological Signatures of the Interaction between Dark-Energy and Massive Neutrinos
Kiyotomo Ichiki, Yong-Yeon Keum
We investigate whether interaction between massive neutrinos and quintessence scalar field is the origin of the late time accelerated expansion of the universe. We present cosmolog…
Cosmic Shear from Scalar-Induced Gravitational Waves
Devdeep Sarkar, Paolo Serra, Asantha Cooray +2
Weak gravitational lensing by foreground density perturbations generates a gradient mode in the shear of background images. In contrast, cosmological tensor perturbations induce a…