Interactions of a Femtosecond Intense Laser with Rare Gas Clusters in a Dense Jet

Li Shaohui, Wang Cheng, Liu Jiansheng, Zhu Pinpin, Wang Xiangxin, Ni Guoquan, Li Ruxin, Xu Zhizhan
2005 Plasma Science and Technology  
Neutrino emission significantly affects the evolution of the accretion tori formed in black hole-neutron star mergers. It removes energy from the disk, alters its composition, and provides a potential power source for a gamma-ray burst. To study these effects, simulations in general relativity with a hot microphysical equation of state (EOS) and neutrino feedback are needed. We present the first such simulation, using a neutrino leakage scheme for cooling to capture the most essential effects
more » ... essential effects and considering a moderate mass (1.4 M neutron star, 5.6 M black hole), high-spin (black hole J /M 2 = 0.9) system with the K 0 = 220 MeV Lattimer-Swesty EOS. We find that about 0.08 M of nuclear matter is ejected from the system, while another 0.3 M forms a hot, compact accretion disk. The primary effects of the escaping neutrinos are (1) to make the disk much denser and more compact, (2) to cause the average electron fraction Y e of the disk to rise to about 0.2 and then gradually decrease again, and (3) to gradually cool the disk. The disk is initially hot (T ∼ 6 MeV) and luminous in neutrinos (L ν ∼ 10 54 erg s −1 ), but the neutrino luminosity decreases by an order of magnitude over 50 ms of post-merger evolution.
doi:10.1088/1009-0630/7/1/020 fatcat:7tz5palicnezreeqgi4tpx3vxu