On inhomogeneous magnetic seed fields and gravitational waves within the MHD limit

Astronomy and Astrophysics – Astrophysics – General Relativity and Quantum Cosmology

Scientific paper

Rate now

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Details

14 pages revtex

Scientific paper

10.1103/PhysRevD.73.103509

In this paper we apply second-order gauge-invariant perturbation theory to investigate the possibility that the non-linear coupling between gravitational waves (GW) and a large scale inhomogeneous magnetic field acts as an amplification mechanism in an `almost' Friedmann-Lemaitre-Robertson-Walker (FLRW) Universe. The spatial inhomogeneities in the magnetic field are consistently implemented using the magnetohydrodynamic (MHD) approximation, which yields an additional source term due to the interaction of the magnetic field with velocity perturbations in the plasma. Comparing the solutions with the corresponding results in our previous work indicates that, on super-horizon scales, the interaction with the spatially inhomogeneous field in the dust regime induces the same boost as the case of a homogeneous field, at least in the ideal MHD approximation. This is attributed to the observation that the MHD induced part of the generated field effectively only contributes on scales where the coherence length of the initial field is less than the Hubble scale. At sub-horizon scales, the GW induced magnetic field is completely negligible in relation to the MHD induced field. Moreover, there is no amplification found in the long-wavelength limit.

No associations

LandOfFree

Say what you really think

Search LandOfFree.com for scientists and scientific papers. Rate them and share your experience with other people.

Rating

On inhomogeneous magnetic seed fields and gravitational waves within the MHD limit does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with On inhomogeneous magnetic seed fields and gravitational waves within the MHD limit, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and On inhomogeneous magnetic seed fields and gravitational waves within the MHD limit will most certainly appreciate the feedback.

Rate now

     

Profile ID: LFWR-SCP-O-599990

  Search
All data on this website is collected from public sources. Our data reflects the most accurate information available at the time of publication.