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

Nobutoshi Yasutake, Kei Kotake, Masa Aki Hashimoto, Shoichi Yamada

    Research output: Contribution to journalArticle

    18 Citations (Scopus)

    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 languageEnglish
    Article number084012
    JournalPhysical Review D - Particles, Fields, Gravitation and Cosmology
    Volume75
    Issue number8
    DOIs
    Publication statusPublished - 2007 Apr 5

    Fingerprint

    Bounce
    massive stars
    gravitational waves
    Star
    Phase Transition
    quantum chromodynamics
    Radiation
    Percent
    Magnetic Field
    Nuclear Matter
    First-order Phase Transition
    Equation of State
    Iron
    Waveform
    Hardness
    Quarks
    Saturation
    Two Parameters
    bags
    magnetic fields

    ASJC Scopus subject areas

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

    Cite this

    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.

    In: Physical Review D - Particles, Fields, Gravitation and Cosmology, Vol. 75, No. 8, 084012, 05.04.2007.

    Research output: Contribution to journalArticle

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