Zobrazeno 1 - 8
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pro vyhledávání: '"Katsuya T. Abe"'
Autor:
Katsuya T. Abe, Hiroyuki Tashiro
Publikováno v:
Physical Review D. 106
We study the diffuse background free-free emission induced by dark matter halos. Since dark matter halos host ionized thermal plasma, they could be an essential source of cosmological free-free emission. We evaluate the global background intensity an
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::98bb8dc74b0c1c782d75f3da13c46048
https://doi.org/10.1103/physrevd.106.063523
https://doi.org/10.1103/physrevd.106.063523
Autor:
Katsuya T. Abe
In this work, we investigate the effect of Population~III~(Pop.~III) stars in ultracompact minihalos~(UCMHs) on the cosmic ionization history using the Planck observation data. Although high-redshift astrophysics is not understood yet, UCMHs could ho
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::e210109b595a12f642327a6097e89390
http://arxiv.org/abs/2208.00375
http://arxiv.org/abs/2208.00375
Autor:
Kenji Hasegawa, Daiki Hashimoto, Hiroyuki Tashiro, Toshiyuki Tanaka, Katsuya T. Abe, Kunihiko Furugori
Publikováno v:
Monthly Notices of the Royal Astronomical Society. 494:4334-4342
Ultracompact minihalos~(UCMHs) can form after the epoch of matter-radiation equality, if the density fluctuations of dark matter have significantly large amplitude on small scales. The constraint on the UCMH abundance allows us to access such small-s
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::40a306cb2890db2489d305da6de2f5da
https://doi.org/10.1093/mnras/staa1033
https://doi.org/10.1093/mnras/staa1033
Primordial black holes (PBHs) whose masses are in $\sim[10^{-15}M_\odot,10^{-11}M_{\odot}]$ have been extensively studied as a candidate of whole dark matter (DM). One of the probes to test such a PBH-DM scenario is scalar-induced stochastic gravitat
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::5cc3a22a0473e309e3239c0a67f52745
We provide a new constraint on the small-scale density fluctuations, evaluating the diffuse background free-free emission from dark matter halos in the dark ages. If there exists a large amplitude of the matter density fluctuations on small scales, t
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::26d57e8798d895d800b4b87c98922d73
Autor:
Hiroyuki Tashiro, Katsuya T. Abe
We investigate the effect of the population III (Pop III) stars supernova explosion~(SN) on the high redshifts reionization history using the latest Planck data. It is predicted that massive Pop~III stars~($130M_\odot\leq M\leq 270M_\odot$) explode e
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::fb0ea39668cffaa8bbd1f7ff4579abf1
Publikováno v:
Journal of Cosmology and Astroparticle Physics. 2021:048
The standard model of particle physics is known to be intriguingly successful. However their rich phenomena represented by the phase transitions (PTs) have not been completely understood yet, including the possibility of the existence of unknown dark
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::c8fdab3bacde1580c050430ee7abfcef
https://doi.org/10.1088/1475-7516/2021/06/048
https://doi.org/10.1088/1475-7516/2021/06/048
Autor:
Katsuya T. Abe
We measure the hadronic branching ratios of the Z{sup 0} boson into heavy quarks: R{sub b} = {Lambda}{sub Z{sup 0}{yields}b{bar b}}/{Lambda}{sub Z{sup 0}{yields}hadrons} and R{sub c} = {Lambda}{sub Z{sup 0}{yields}c{bar c}}/{Lambda}{sub Z{sup 0}{yiel
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::347bb5d7bf2c2a63ae4cd800ccd729ad
https://doi.org/10.2172/839817
https://doi.org/10.2172/839817