Zobrazeno 1 - 10
of 138
pro vyhledávání: '"Hiroki Nagakura"'
Autor:
Shoichi YAMADA, Hiroki NAGAKURA, Ryuichiro AKAHO, Akira HARADA, Shun FURUSAWA, Wakana IWAKAMI, Hirotada OKAWA, Hideo MATSUFURU, Kohsuke SUMIYOSHI
Publikováno v:
Proceedings of the Japan Academy. Series B, Physical and Biological Sciences, Vol 100, Iss 3, Pp 190-233 (2024)
The current understanding of the mechanism of core-collapse supernovae (CCSNe), one of the most energetic events in the universe associated with the death of massive stars and the main formation channel of compact objects such as neutron stars and bl
Externí odkaz:
https://doaj.org/article/0ce48a3f394045439bd10c08fc31d132
Publikováno v:
The Astrophysical Journal, Vol 960, Iss 2, p 116 (2024)
We investigate the late-time neutrino emission powered by fallback mass accretion onto a protoneutron star (PNS), using neutrino radiation-hydrodynamic simulations with full Boltzmann neutrino transport. We follow the time evolution of the accretion
Externí odkaz:
https://doaj.org/article/e80895df61994e6faf5647dbada95735
Autor:
Ore Gottlieb, Hiroki Nagakura, Alexander Tchekhovskoy, Priyamvada Natarajan, Enrico Ramirez-Ruiz, Sharan Banagiri, Jonatan Jacquemin-Ide, Nick Kaaz, Vicky Kalogera
Publikováno v:
The Astrophysical Journal Letters, Vol 951, Iss 2, p L30 (2023)
Upcoming LIGO–Virgo–KAGRA (LVK) observing runs are expected to detect a variety of inspiralling gravitational-wave (GW) events that come from black hole and neutron star binary mergers. Detection of noninspiral GW sources is also anticipated. We
Externí odkaz:
https://doaj.org/article/64685045a6434f6a9094a4f3188784cf
Autor:
Ryuichiro Akaho, Akira Harada, Hiroki Nagakura, Wakana Iwakami, Hirotada Okawa, Shun Furusawa, Hideo Matsufuru, Kohsuke Sumiyoshi, Shoichi Yamada
Publikováno v:
The Astrophysical Journal, Vol 944, Iss 1, p 60 (2023)
We investigate protoneutron star (PNS) convection using our newly developed general relativistic Boltzmann neutrino radiation hydrodynamics code. This is a pilot study for more comprehensive investigations later. As such, we take a snapshot of a PNS
Externí odkaz:
https://doaj.org/article/7594003cace643a9b7fc3eb81b194c3c
Publikováno v:
Physical Review Research, Vol 2, Iss 1, p 012046 (2020)
We make a strong case that the fast neutrino-flavor conversion, one of the collective flavor oscillation modes, commonly occurs in core-collapse supernovae (CCSNs). It is confirmed in the numerical data obtained in realistic simulations of CCSNs, but
Externí odkaz:
https://doaj.org/article/35022eb137ad49f39f618a777b9224fd
Autor:
Hiroki Nagakura
Publikováno v:
Physical Review Letters. 130
One of the greatest uncertainties in any modeling of inner engine of core-collapse supernova (CCSN) is neutrino flavor conversions driven by neutrino self-interactions. We carry out large-scale numerical simulations of multi-energy, multi-angle, thre
Autor:
Hiroki Nagakura, Masamichi Zaizen
Publikováno v:
Physical Review D. 107
We present a systematic study of fast neutrino-flavor conversion (FFC) with both small-scale and large-scale numerical simulations in spherical symmetry. We find that FFCs can, in general, reach a quasi-steady state, and these features in the non-lin
Publikováno v:
IEEJ Journal of Industry Applications. 11:419-426
Autor:
Hiroki Nagakura, David Vartanyan
Publikováno v:
Monthly Notices of the Royal Astronomical Society. 512:2806-2816
In this paper, we present a novel method to estimate the time evolution of the proto-neutron star (PNS) structure from the neutrino signal in a core-collapse supernova (CCSN). Employing recent results from multidimensional CCSN simulations, we delve
Autor:
Masamichi Zaizen, Hiroki Nagakura
Publikováno v:
Physical Review Letters. 129
Despite the theoretical indication that fast neutrino-flavor conversion (FFC) ubiquitously occurs in core-collapse supernova and binary neutron star merger, the lack of global simulations has been the greatest obstacle to study their astrophysical co