Zobrazeno 1 - 10
of 484
pro vyhledávání: '"Tashiro, Hiroyuki"'
The magneto-hydrodynamic decay of primordial magnetic fields can distort the black-body spectrum of the cosmic microwave background (CMB) by draining magnetic energy into thermal plasmas and photons. The current limits on CMB distortion place constra
Externí odkaz:
http://arxiv.org/abs/2411.03183
Publikováno v:
JCAP10(2024)091
Understanding the survival of gas within subhalos under various astrophysical processes is crucial for elucidating cosmic structure formation and evolution. We study the resilience of gas in subhalos, focusing on the impact of tidal and ram pressure
Externí odkaz:
http://arxiv.org/abs/2404.01034
Autor:
Abe, Katsuya T., Tashiro, Hiroyuki
Publikováno v:
Phys. Rev. D 109, (2024) 103524
Some theoretical models for the early Universe predict a spike-type enhancement in the primordial power spectrum on a small scale, which would result in forming early-formed dark matter halos~(EFHs). Some recent studies have claimed to have placed li
Externí odkaz:
http://arxiv.org/abs/2401.00407
Numerous observations have shown that almost all galaxies in our Universe host supermassive black holes (SMBHs), but there is still much debate about their formation and evolutionary processes. Recently, gravitational waves (GWs) have been expected t
Externí odkaz:
http://arxiv.org/abs/2306.16281
Autor:
Minoda, Teppei, Saga, Shohei, Takahashi, Tomo, Tashiro, Hiroyuki, Yamauchi, Daisuke, Yokoyama, Shuichiro, Yoshiura, Shintaro
In the most distant reaches of the Universe, the 21-cm hyperfine transition in neutral hydrogen provides one of the only available tracers of large-scale structure. A number of instruments have been working and planned to measure the 21-cm line signa
Externí odkaz:
http://arxiv.org/abs/2303.07604
The tomography of the polarized Sunyaev-Zeldvich effect due to free electrons of galaxy clusters can be used to constrain the nature of dark energy because CMB quadrupoles at different redshifts as the polarization source are sensitive to the integra
Externí odkaz:
http://arxiv.org/abs/2301.13676
Autor:
Abe, Katsuya T., Tashiro, Hiroyuki
Publikováno v:
Phys.Rev.D 106 (2022) 6, 063523
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:
http://arxiv.org/abs/2206.11261
A positive observational proof suggests that most galaxies contain a central supermassive black hole (SMBH) with mass in the range of $10^6M_\odot$ $-$ $10^{10}M_\odot$. It is suggested that the mass of SMBHs is proportionally related to that of the
Externí odkaz:
http://arxiv.org/abs/2206.01443
Autor:
Kadota, Kenji, Tashiro, Hiroyuki
We study the synchrotron radio emission in the mixed dark matter scenarios consisting of the primordial black holes (PBHs) and the self-annihilating WIMPs (weakly interacting massive particles). The WIMPs can form the ultracompact minihalos around PB
Externí odkaz:
http://arxiv.org/abs/2204.13273