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Nagisa Hiroshima

Researcher at KEK

Publications -  22
Citations -  716

Nagisa Hiroshima is an academic researcher from KEK. The author has contributed to research in topics: Dark matter & Cherenkov Telescope Array. The author has an hindex of 10, co-authored 16 publications receiving 412 citations. Previous affiliations of Nagisa Hiroshima include University of Tokyo & University of Toyama.

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MeV-scale reheating temperature and thermalization of oscillating neutrinos by radiative and hadronic decays of massive particles

TL;DR: In this paper, the authors investigated lower limits on the reheating temperature imposed by big-bang nucleosynthesis assuming both radiative and hadronic decays of such massive particles.
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MeV-scale reheating temperature and thermalization of oscillating neutrinos by radiative and hadronic decays of massive particles

TL;DR: In this article, the authors investigated lower limits on the reheating temperature imposed by big-bang nucleosynthesis assuming both radiative and hadronic decays of such massive particles.
Journal ArticleDOI

Sensitivity of the Cherenkov Telescope Array to a dark matter signal from the Galactic centre

Ayan Acharyya, +456 more
TL;DR: In this paper, the authors provide an updated assessment of the power of the Cherenkov Telescope Array (CTA) to search for thermally produced dark matter at the TeV scale via the associated gamma-ray signal from pair-annihilating dark matter particles in the region around the Galactic centre.
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Modeling evolution of dark matter substructure and annihilation boost

TL;DR: In this paper, the sub-sub-halos of a galaxy were modeled and the authors developed an analytical prescription that models the subhalo mass evolution and calibrates it to results of numerical simulations of various scales from very small (Earth size) to large (galaxies to clusters) halos.
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Sensitivity of the Cherenkov Telescope Array for probing cosmology and fundamental physics with gamma-ray propagation

H. Abdalla, +504 more
TL;DR: The Cherenkov Telescope Array (CTA) provides unique capabilities to address significant open questions in astrophysics, cosmology, and fundamental physics as mentioned in this paper, which can be explored as part of the Key Science Projects of CTA through simulated observations of active galactic nuclei and of their relativistic jets.