HADRON–QUARK CROSSOVER AND MASSIVE HYBRID STARS WITH STRANGENESS

By Kota Masuda, T. Hatsuda, T. Takatsuka. 2012

137 citations recorded by the source corpus.

Using the idea of smooth crossover from hadronic matter with hyperons to quark matter with strangeness, we show that the maximum mass (Mmax) of neutron stars with quark matter cores can be larger than those without quark matter cores. This is in contrast to the conventional softening of the equation of state due to exotic components at high density. The essential conditions for reaching our conclusion are that (1) the crossover takes place at relatively low densities, around three times the normal nuclear density and (2) the quark matter is strongly interacting in the crossover region. From these, the pressure of the system can be greater than that of purely hadronic matter at a given baryon density in the crossover density region and leads to Mmax greater than 2 solar mass. This conclusion is insensitive to the different choice of the hadronic equation of state with hyperons. We remark upon several implications of this result to the nuclear incompressibility, the hyperon mixing, and the neutrino cooling.

Subfields: Astronomy and Astrophysics, Nuclear and High Energy Physics

View Paper: https://www.semanticscholar.org/paper/4838309ae143c8c628f8795a6a43169d508aef9a

How researchers see this paper

The researchers whose trusted networks rank it highest, strongest advocate first. Every researcher gets a different order.

In Astronomy and Astrophysics

1. T. Hatsuda
2. Toru Kojo
3. G. Baym

In Nuclear and High Energy Physics

1. T. Hatsuda
2. Toru Kojo
3. G. Baym

Citations in the corpus

• New Neutron Star Equation of State with Quark–Hadron Crossover (2019, background): “…matter equation of state at low to medium densities, a strongly interacting quark matter equation of state at high density, and constructing a thermodynamically consistent (and highly constrained) interpolation between the two regimes (Masuda et al. (2013); Kojo et al. (2015); Baym et al. (2018)).”
• Hadron-quark crossover and massive hybrid stars (2012, unknown): “Hadron-Quark Crossover and Massive Hybrid Stars 益田晃太 、初田哲男 、高塚龍之 B 東大理 、理研 B 概要 ハイペロンを含むハドロン相からストレンジクォークを含むクォーク相へのクロスオーバーを仮定 した状態方程式を用いて中性子星の物理について議論する。(i) クロスオーバーが比較的低密度 ((34)ρ0(ρ0:原子核密度))で生じ、(ii)クォーク相が強く相互作用している、という 2つの条件下でクォー ク相の影響により、2M⊙ を超え得ることを示す。これは高密度におけるエキゾチックな成分の出現に よる一般的な状態方程式の軟化と反する結果である”