scholarly journals NUCLEAR EQUATION OF STATE FOR CORE-COLLAPSE SUPERNOVAE WITH REALISTIC NUCLEAR FORCES

2015 ◽  
Author(s):  
Hajime Togashi
Keyword(s):  
Equation Of State ◽  
Core Collapse ◽  
Nuclear Forces ◽  
Nuclear Equation Of State

scholarly journals Nuclear equation of state for core-collapse supernova simulations with realistic nuclear forces

2017 ◽  
Vol 961 ◽  
pp. 78-105 ◽  
Author(s):  
H. Togashi ◽  
K. Nakazato ◽  
Y. Takehara ◽  
S. Yamamuro ◽  
H. Suzuki ◽  
...  
Keyword(s):  
Equation Of State ◽  
Core Collapse ◽  
Nuclear Forces ◽  
Core Collapse Supernova ◽  
Nuclear Equation Of State

scholarly journals A new equation of state for core-collapse supernovae based on realistic nuclear forces and including a full nuclear ensemble

2017 ◽  
Vol 44 (9) ◽  
pp. 094001 ◽  
Author(s):  
S Furusawa ◽  
H Togashi ◽  
H Nagakura ◽  
K Sumiyoshi ◽  
S Yamada ◽  
...  
Keyword(s):  
Equation Of State ◽  
Core Collapse ◽  
Nuclear Forces ◽  
New Equation

scholarly journals Equation-of-state Dependence of Gravitational Waves in Core-collapse Supernovae

2021 ◽  
Vol 923 (2) ◽  
pp. 201
Author(s):  
Oliver Eggenberger Andersen ◽  
Shuai Zha ◽  
André da Silva Schneider ◽  
Aurore Betranhandy ◽  
Sean M. Couch ◽  
...  
Keyword(s):  
Equation Of State ◽  
Gravitational Waves ◽  
Effective Mass ◽  
State Dependence ◽  
Peak Frequency ◽  
Core Collapse ◽  
Thermal Dependence ◽  
Nuclear Equation Of State ◽  
Strong Excitation ◽  
Rule Out

Abstract Gravitational waves (GWs) provide unobscured insight into the birthplace of neutron stars and black holes in core-collapse supernovae (CCSNe). The nuclear equation of state (EOS) describing these dense environments is yet uncertain, and variations in its prescription affect the proto−neutron star (PNS) and the post-bounce dynamics in CCSN simulations, subsequently impacting the GW emission. We perform axisymmetric simulations of CCSNe with Skyrme-type EOSs to study how the GW signal and PNS convection zone are impacted by two experimentally accessible EOS parameters, (1) the effective mass of nucleons, m ⋆, which is crucial in setting the thermal dependence of the EOS, and (2) the isoscalar incompressibility modulus, K sat. While K sat shows little impact, the peak frequency of the GWs has a strong effective mass dependence due to faster contraction of the PNS for higher values of m ⋆ owing to a decreased thermal pressure. These more compact PNSs also exhibit more neutrino heating, which drives earlier explosions and correlates with the GW amplitude via accretion plumes striking the PNS, exciting the oscillations. We investigate the spatial origin of the GWs and show the agreement between a frequency-radial distribution of the GW emission and a perturbation analysis. We do not rule out overshoot from below via PNS convection as another moderately strong excitation mechanism in our simulations. We also study the combined effect of effective mass and rotation. In all our simulations we find evidence for a power gap near ∼1250 Hz; we investigate its origin and report its EOS dependence.

scholarly journals New Nuclear Equation of State for Core-Collapse Supernovae with the Variational Method

2014 ◽  
Vol 66 ◽  
pp. 07026
Author(s):  
H. Togashi ◽  
S. Yamamuro ◽  
K. Nakazato ◽  
M. Takano ◽  
H. Suzuki ◽  
...  
Keyword(s):  
Equation Of State ◽  
Variational Method ◽  
Core Collapse ◽  
Nuclear Equation Of State
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