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The Study of Phase Transition in High Density Nuclear Matter and Properties of Hybrid Stars

Author: PanNaNa
Tutor: ZhengXiaoPing
School: Central China Normal University
Course: Theoretical Physics
Keywords: Strange Quark Matter Hybrid stars Equation of state Bulk Viscosity
CLC: O572.33
Type: Master's thesis
Year: 2005
Downloads: 35
Quote: 0
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Abstract


In order to separate the different dense star-forming region , the people most likely to think of is the equation of state of a substance may lead to differences in these compact objects mass - radius relation . In this paper , we introduce a mixed star background and may be involved in astrophysical problems premise describes the normal nuclear matter equation of state of strange quark matter , and the description of the neutron star shell Baym subnuclear density -Pethick-Sutherland model , the nuclear density , the effective mass of the relativistic mean field theory and taking into account the medium effects of quark bag model discussed in the neutron star within the high-density phase change , given the mixed star equation of state . We found that the mixed phase appeared to soften the equation of state of the system , in the same quality , mixed star radius between neutron stars and strange stars . Wang has studied relative to the normal nuclear matter , much larger bulk viscosity of strange quark matter , and hope this inspires people to dense matter by studying the dynamics lead to differences of the compact star rotation period to permit the recognition of a new compact objects . Especially in recent years , the r- mode instability , strange quark matter and neutron matter bulk viscosity huge difference by a greater emphasis on the discovery of the rotating compact stars exist . We here study the Bulk Viscosity of mixed - phase material , calculation of the two types of non-leptonic process ( hyperon and quark non- leptonic decay ) mixed phase viscosity . Our results show that the mixed phase appears , making the Bulk Viscosity improve , and thus will be stronger inhibition of r- mode instability . Compared to neutron stars and strange stars , hybrid stars corresponding critical rotation frequency , and thus better able to explain the observed data faster . Our results also revealed that the high - speed rotating pulsars may indicate the presence of the stellar strange matter within and not be able to distinguish between the hyperon substances or strange quark matter .

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CLC: > Mathematical sciences and chemical > Physics > Nuclear physics,high energy physics > High-energy physics > Particle types > Meson
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