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Sotani, Hajime*; Maruyama, Toshiki; Tatsumi, Toshitaka*
Nuclear Physics A, 906, p.37 - 49, 2013/05
Times Cited Count：15 Percentile：68.29(Physics, Nuclear)Inside neutron stars, the hadron-quark mixed phase is expected during the first order phase transition from the hadron phase to the quark phase. The geometrical structure of the mixed phase strongly depends on the surface tension at the hadron-quark interface. We evaluate the shear modulus which is one of the specific properties of the hadron-quark mixed phase. As an application, we study shear oscillations due to the hadron-quark mixed phase in neutron stars. We find that the frequencies of shear oscillations depend strongly on the surface tension; with a fixed stellar mass, the fundamental frequencies are almost proportional to the surface tension. Thus, one can estimate the value of surface tension via the observation of stellar oscillations with the help of the information on the stellar mass.
Yasutake, Nobutoshi*; Noda, Tsuneo*; Sotani, Hajime*; Maruyama, Toshiki; Tatsumi, Toshitaka*
Recent Advances in Quarks Research, p.63 - 111, 2013/01
Sotani, Hajime*; Yasutake, Nobutoshi*; Maruyama, Toshiki; Tatsumi, Toshitaka*
Physical Review D, 83(2), p.024014_1 - 024014_8, 2011/01
Times Cited Count：82 Percentile：93.39(Astronomy & Astrophysics)We calculate stellar oscillations including the hadron-quark mixed phase considering the finite size effects. We find that it is possible to distinguish whether the mixed phase exists or not in stars, even if one will observe the gravitational waves of the fundamental mode. Additionally, the normalized eigenfrequencies of pressure modes depend strongly on the stellar mass and on the adopted equation of state. Especially, in spite of the fact that the radius of the neutron star with 1.4 times the solar mass, which is standard mass, is almost independent from the equation of state with quark matter, the frequencies of pressure modes depend on the adopted equation of state. Thus, via observing the many kinds of gravitational waves, it will be possible to make a restriction on the equation of state.
Sotani, Hajime*; Yasutake, Nobutoshi*; Maruyama, Toshiki; Tatsumi, Toshitaka*
no journal, ,
no abstracts in English
