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Sökning: swepub > Umeå universitet > Refereegranskat > (2000-2004) > Marklund Mattias

  • Resultat 11-20 av 22
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  • Servin, Martin, et al. (författare)
  • Cyclotron damping and Faraday rotation of gravitational waves
  • 2001
  • Ingår i: Physical Review D. - : American Physical Society. - 2470-0010 .- 2470-0029. ; 64
  • Tidskriftsartikel (refereegranskat)abstract
    • We study the propagation of gravitational waves in a collisionless plasma with an external magnetic field parallel to the direction of propagation. Because of resonant interaction with the plasma particles the gravitational wave experiences cyclotron damping or growth, the latter case being possible if the distribution function for any of the particle species deviates from thermodynamical equilibrium. Furthermore, we examine how the damping and dispersion depends on temperature and on the ratio between the cyclotron and gravitational wave frequency. The presence of the magnetic field leads to different dispersion relations for different polarizations, which in turn imply Faraday rotation of gravitational waves.
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  • Servin, Martin, et al. (författare)
  • Nonlinear self-interaction of gravitational waves
  • 2003
  • Ingår i: Physical Review D. - : American Physical Society. - 2470-0010 .- 2470-0029. ; 67
  • Tidskriftsartikel (refereegranskat)abstract
    • Recently Mendonca and Cardoso [Phys. Rev. D 66, 104009 (2002)] considered nonlinear gravitational wave packets propagating in flat space-time. They concluded that the evolution equation—to third order in amplitude—takes a similar form to what arises in nonlinear optics. Based on this equation, the authors found that nonlinear gravitational waves exhibit self-phase modulation and high harmonic generation leading to frequency up-shifting and spectral energy dilution of the gravitational wave energy. In this Brief Report we point out the fact—a possibility that seems to have been overlooked by Mendonca and Cardoso—that the nonlinear terms in the evolution equation cancels and, hence, that there is no amplitude evolution of the pulse. Finally we discuss scenarios where these nonlinearities may play a role.
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  • Servin, Martin, et al. (författare)
  • Parametric excitation of Alfvén waves by gravitational radiation
  • 2000
  • Ingår i: Physical review. E. - : American Physical Society. - 2470-0045 .- 2470-0053. ; 62, s. 8493-8500
  • Tidskriftsartikel (refereegranskat)abstract
    • We consider the parametric excitation of Alfvén waves by gravitational radiation propagating on a Minkowski background, parallel to an external magnetic field. As a starting point, standard ideal magnetohydrodynamics equations incorporating the curvature of space-time has been derived. The growth rate of the Alfvén waves has been calculated, using the normal-mode approach. Various astrophysical applications of our investigations are discussed, and finally we demonstrate that the coupling coefficients of the interacting modes fulfill the Manley-Rowe relations.
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  • Resultat 11-20 av 22

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