Gravitational waves from a spinning particle scattered by a relativistic star

Axial mode case

Kazuhiro Tominaga, Motoyuki Saijo, Keiichi Maeda

    Research output: Contribution to journalArticle

    7 Citations (Scopus)

    Abstract

    We use a perturbation method to study gravitational waves from a spinning test particle scattered by a relativistic star. The present analysis is restricted to axial modes. By calculating the energy spectrum, the wave forms, and the total energy and angular momentum of gravitational waves, we analyze the dependence of the emitted gravitational waves on particle spin. For a normal neutron star, the energy spectrum has one broad peak whose characteristic frequency corresponds to the angular velocity at the turning point (a periastron). Since the turning point is determined by the orbital parameter, there exists a dependence of the gravitational wave on particle spin. We find that the total energy of 1=2 gravitational waves gets larger as the spin increases in the antiparallel direction to the orbital angular momentum. For an ultracompact star, in addition to such an orbital contribution, we find the quasinormal modes excited by a scattered particle, whose excitation rate to gravitational waves depends on the particle spin. We also discuss the ratio of the total angular momentum to the total energy of gravitational waves and explain its spin dependence.

    Original languageEnglish
    Article number124012
    JournalPhysical Review D
    Volume63
    Issue number12
    DOIs
    Publication statusPublished - 2001

    Fingerprint

    axial modes
    Gravitational Waves
    gravitational waves
    metal spinning
    Star
    stars
    particle spin
    Angular Momentum
    angular momentum
    Turning Point
    Energy Spectrum
    orbitals
    energy spectra
    Energy
    Quasinormal Modes
    Antiparallel
    Neutron Stars
    Angular velocity
    Perturbation Method
    angular velocity

    ASJC Scopus subject areas

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

    Cite this

    Gravitational waves from a spinning particle scattered by a relativistic star : Axial mode case. / Tominaga, Kazuhiro; Saijo, Motoyuki; Maeda, Keiichi.

    In: Physical Review D, Vol. 63, No. 12, 124012, 2001.

    Research output: Contribution to journalArticle

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