### Abstract

We perform two-dimensional, magneto-hydrodynamical core-collapse simulations of massive stars accompanying the QCD phase transition. We study how the phase-transition affects the gravitational waveforms near the epoch of core-bounce. As for initial models, we change the strength of rotation and magnetic fields. Particularly, the degree of differential rotation in the iron core (Fe-core) is changed parametrically. As for the microphysics, we adopt a phenomenological equation of state above the saturation density, including two parameters to change the hardness before the transition. We assume the first order phase transition, where the conversion of bulk nuclear matter to a chirally symmetric quark-gluon phase is described by the MIT bag model. Based on these computations, we find that the phase transition can make the maximum amplitudes larger up to ∼10 percents than the ones without the phase transition. On the other hand, when the degree of the differential rotation becomes larger, the maximum amplitudes become smaller up to ∼10 percents owing to the phase transition. We find that even extremely strong magnetic fields ∼1017G in the protoneutron star do not affect these results.

Original language | English |
---|---|

Article number | 084012 |

Journal | Physical Review D - Particles, Fields, Gravitation and Cosmology |

Volume | 75 |

Issue number | 8 |

DOIs | |

Publication status | Published - 2007 Apr 5 |

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### ASJC Scopus subject areas

- Physics and Astronomy(all)
- Nuclear and High Energy Physics
- Mathematical Physics

### Cite this

*Physical Review D - Particles, Fields, Gravitation and Cosmology*,

*75*(8), [084012]. https://doi.org/10.1103/PhysRevD.75.084012

**Effects of QCD phase transition on gravitational radiation from two-dimensional collapse and bounce of massive stars.** / Yasutake, Nobutoshi; Kotake, Kei; Hashimoto, Masa Aki; Yamada, Shoichi.

Research output: Contribution to journal › Article

*Physical Review D - Particles, Fields, Gravitation and Cosmology*, vol. 75, no. 8, 084012. https://doi.org/10.1103/PhysRevD.75.084012

}

TY - JOUR

T1 - Effects of QCD phase transition on gravitational radiation from two-dimensional collapse and bounce of massive stars

AU - Yasutake, Nobutoshi

AU - Kotake, Kei

AU - Hashimoto, Masa Aki

AU - Yamada, Shoichi

PY - 2007/4/5

Y1 - 2007/4/5

N2 - We perform two-dimensional, magneto-hydrodynamical core-collapse simulations of massive stars accompanying the QCD phase transition. We study how the phase-transition affects the gravitational waveforms near the epoch of core-bounce. As for initial models, we change the strength of rotation and magnetic fields. Particularly, the degree of differential rotation in the iron core (Fe-core) is changed parametrically. As for the microphysics, we adopt a phenomenological equation of state above the saturation density, including two parameters to change the hardness before the transition. We assume the first order phase transition, where the conversion of bulk nuclear matter to a chirally symmetric quark-gluon phase is described by the MIT bag model. Based on these computations, we find that the phase transition can make the maximum amplitudes larger up to ∼10 percents than the ones without the phase transition. On the other hand, when the degree of the differential rotation becomes larger, the maximum amplitudes become smaller up to ∼10 percents owing to the phase transition. We find that even extremely strong magnetic fields ∼1017G in the protoneutron star do not affect these results.

AB - We perform two-dimensional, magneto-hydrodynamical core-collapse simulations of massive stars accompanying the QCD phase transition. We study how the phase-transition affects the gravitational waveforms near the epoch of core-bounce. As for initial models, we change the strength of rotation and magnetic fields. Particularly, the degree of differential rotation in the iron core (Fe-core) is changed parametrically. As for the microphysics, we adopt a phenomenological equation of state above the saturation density, including two parameters to change the hardness before the transition. We assume the first order phase transition, where the conversion of bulk nuclear matter to a chirally symmetric quark-gluon phase is described by the MIT bag model. Based on these computations, we find that the phase transition can make the maximum amplitudes larger up to ∼10 percents than the ones without the phase transition. On the other hand, when the degree of the differential rotation becomes larger, the maximum amplitudes become smaller up to ∼10 percents owing to the phase transition. We find that even extremely strong magnetic fields ∼1017G in the protoneutron star do not affect these results.

UR - http://www.scopus.com/inward/record.url?scp=34047251691&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=34047251691&partnerID=8YFLogxK

U2 - 10.1103/PhysRevD.75.084012

DO - 10.1103/PhysRevD.75.084012

M3 - Article

AN - SCOPUS:34047251691

VL - 75

JO - Physical review D: Particles and fields

JF - Physical review D: Particles and fields

SN - 0556-2821

IS - 8

M1 - 084012

ER -