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Watanabe, Gentaro*; Maruyama, Toshiki
Neutron Star Crust, p.23 - 44, 2012/10
In supernova cores and neutron star crusts, nuclei with exotic shapes such as rod-like and slab-like nuclei are expected to exist. These nuclei are collectively called nuclear "pasta". For the past decades, existence of the pasta phases in the equilibrium state has been studied using various methods. Recently, the formation process of the pasta phases, which has been a long-standing problem, has been unveiled using molecular dynamics simulations. In this review, we first provide the astrophysical background of supernovae and neutron stars and overview the history of the study of the pasta phases. We then focus on the recent study on the formation process of the pasta phases. Finally, we discuss future important issues related to the pasta phases: their astrophysical evidence and consequences.
Maruyama, Toshiki; Watanabe, Gentaro*; Chiba, Satoshi
Progress of Theoretical and Experimental Physics (Internet), 2012, p.01A201_1 - 01A201_27, 2012/08
Times Cited Count：15 Percentile：64.76(Physics, Multidisciplinary)We review our works on the molecular dynamics studies on the structures and dynamics of nuclear matter relevant to the neutron star crusts and supernova cores. First we focus on the "pasta" structures of low-density nuclear matter which have been predicted by many works with assuming the nuclear shape. In our works by the use of quantum molecular dynamics, we do not need assume any geometry. Next we show our calculation with a compression of the system which corresponds to the collapsing stage of supernova. With the increase of density, a crystalline solid of spherical nuclei will change to a triangular lattice of rods by connection of two neighboring nuclei. Finally, we discuss the fragment formation of expanding nuclear matter. Unlike a generally accepted scenario based on the gas-liquid phase transition, cold solid like matter breaks into fragments by the formation of cracks.
Watanabe, Gentaro*; Sonoda, Hidetaka*; Maruyama, Toshiki; Sato, Katsuhiko*; Yasuoka, Kenji*; Ebisuzaki, Toshikazu*
Physical Review Letters, 103(12), p.121101_1 - 121101_4, 2009/09
Times Cited Count：70 Percentile：90.38(Physics, Multidisciplinary)no abstracts in English
Watanabe, Gentaro*; Maruyama, Toshiki; Sato, Katsuhiko*; Yasuoka, Kenji*; Ebisuzaki, Toshikazu*
Physical Review Letters, 94(3), p.031101_1 - 031101_4, 2005/01
Times Cited Count：93 Percentile：91.82(Physics, Multidisciplinary)no abstracts in English
Ambai, Hiromu; Goto, Ichiro*; Miyazaki, Yasunori; Sano, Yuichi; Takeuchi, Masayuki; Watanabe, Masayuki; Nemoto, Gentaro*
no journal, ,
no abstracts in English
