Zobrazeno 1 - 10
of 144
pro vyhledávání: '"Shuichiro Yokoyama"'
Publikováno v:
The Astrophysical Journal, Vol 959, Iss 2, p 117 (2023)
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:
https://doaj.org/article/f1422217cd984d5eac9f739d18f4ec54
Autor:
Yuki Kawasaki, Ryuma Shimizu, Tomohiro Ishikawa, Koji Nagano, Shoki Iwaguchi, Izumi Watanabe, Bin Wu, Shuichiro Yokoyama, Seiji Kawamura
Publikováno v:
Galaxies, Vol 10, Iss 1, p 25 (2022)
The DECi-hertz Interferometer Gravitational-Wave Observatory (DECIGO) is a space gravitational wave (GW) detector. DECIGO was originally designed to be sensitive enough to observe primordial GW background (PGW). However, due to the lowered upper limi
Externí odkaz:
https://doaj.org/article/ddb840046df0448db30eb13186b2aae7
Autor:
Teppei Minoda, Shohei Saga, Tomo Takahashi, Hiroyuki Tashiro, Daisuke Yamauchi, Shuichiro Yokoyama, Shintaro Yoshiura
Publikováno v:
Publications of the Astronomical Society of Japan. 75:S154-S180
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:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::7ac1c0d77c3cf7aa828a0607e92b4214
https://doi.org/10.1093/pasj/psac015
https://doi.org/10.1093/pasj/psac015
Publikováno v:
Physical Review D. 106
Recently, the cross-correlation between $E$- and $B$-mode polarization of the cosmic microwave background (CMB), which is well explained by cosmic birefringence with rotation angle $\beta\approx 0.3$ deg, has been found in CMB polarization data. We c
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::579650e702abd3f565ef8f80fd21cf50
https://doi.org/10.1103/physrevd.106.103529
https://doi.org/10.1103/physrevd.106.103529
Autor:
Bin Wu, Tomohiro Ishikawa, Shoki Iwaguchi, Ryuma Shimizu, Izumi Watanabe, Yuki Kawasaki, Yuta Michimura, Shuichiro Yokoyama, Seiji Kawamura
Publikováno v:
Physical Review D. 106
The Juggled interferometer (JIFO) is an earth-based gravitational wave detector using repeatedly free-falling test masses. With no worries of seismic noise and suspension thermal noise, the JIFO can have much better sensitivity at lower frequencies t
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::329993f1c73cda12422f3012b6d1ca40
https://doi.org/10.1103/physrevd.106.042007
https://doi.org/10.1103/physrevd.106.042007
Autor:
Shun Arai, Katsuki Aoki, Yuji Chinone, Rampei Kimura, Tsutomu Kobayashi, Hironao Miyatake, Daisuke Yamauchi, Shuichiro Yokoyama, Kazuyuki Akitsu, Takashi Hiramatsu, Shin’ichi Hirano, Ryotaro Kase, Taishi Katsuragawa, Yosuke Kobayashi, Toshiya Namikawa, Takahiro Nishimichi, Teppei Okumura, Maresuke Shiraishi, Masato Shirasaki, Tomomi Sunayama, Kazufumi Takahashi, Atsushi Taruya, Junsei Tokuda
Since the discovery of the accelerated expansion of the present Universe, significant theoretical developments have been made in the area of modified gravity. In the meantime, cosmological observations have been providing more high-quality data, allo
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::08537e969c8d7b781ac8ca70de9c7190
We investigate the probability distribution of the effective inspiral spin, the mass ratio, and the chirp mass of primordial black hole (PBH) binaries, incorporating the effect of the critical phenomena of gravitational collapse. As a leading order e
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::45f5ec8f9f429b807577285a1879f700
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
In this work, we have performed numerical simulations of primordial black hole (PBH) formation in the Friedman-Lema\^itre-Robertson-Walker universe filled by radiation fluid, introducing the local-type non-Gaussianity to the primordial curvature fluc
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::d64597fccb40bf334201c1cc7aa242ae
Publikováno v:
Monthly Notices of the Royal Astronomical Society. 490:4419-4427
Spatially fluctuating primordial magnetic fields (PMFs) inhomogeneously reheat the Universe when they dissipate deep inside the horizon before recombination. Such an energy injection turns into an additional photon temperature perturbation. We invest
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::cfc5b25c82681bb79a05a52f586448dc
https://doi.org/10.1093/mnras/stz2882
https://doi.org/10.1093/mnras/stz2882