339 citations · 3k across the 59 of their papers we have counts for
59 papers
Cosmological 21cm line observations to test scenarios of super-Eddington accretion on to black holes being seeds of high-redshifted supermassive black holes
Kazunori Kohri, Toyokazu Sekiguchi, Sai Wang
In this paper, we study scenarios of the super-Eddington accretion onto black holes at high redshifts , which are expected to be seeds to evolve to supermassive black holes…
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…
Revisiting CMB constraints on dark matter annihilation
Masahiro Kawasaki, Hiromasa Nakatsuka, Kazunori Nakayama +1
The precision measurements of the cosmic microwave background power spectrum put a strong constraint on the dark matter annihilation cross section since the electromagnetic energy…
Impacts of new small-scale N-body simulations on dark matter annihilations constrained from cosmological 21cm line observations
Nagisa Hiroshima, Kazunori Kohri, Toyokazu Sekiguchi +1
We revisit constraints on annihilating dark matter based on the global 21cm signature observed by EDGES. For this purpose, we used the numerical data of the latest N-body simulatio…
Cosmological bound on neutrino masses in the light of tension
Toyokazu Sekiguchi, Tomo Takahashi
Although cosmic microwave background (CMB) is the most powerful cosmological probe of neutrino masses, it is in trouble with local direct measurements of , which is called the…
Early recombination as a solution to the tension
Toyokazu Sekiguchi, Tomo Takahashi
We show that the tension can be resolved by making recombination earlier, keeping the fit to cosmic microwave background (CMB) data almost intact. We provide a suite of gener…