Large Scale Magnetic Fields: Density Power Spectrum in Redshift Space

Details Large Scale Magnetic Fields: Density Power Spectrum in Redshift Space Large Scale Magnetic Fields: Density Power Spectrum in Redshift Space

Dec 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003japa...24...51g&link_type=abstract

Journal of Astrophysics and Astronomy, 24, p. 51-68

Astronomy and Astrophysics

Astrophysics

13

Cosmology: Theory-Large-Scale Structure Of The Universe, Magnetic Fields, Mhd

Scientific paper

We compute the density redshift-space power spectrum in the presence of tangled magnetic fields and compare it with existing observations. Our analysis shows that if these magnetic fields originated in the early universe then it is possible to construct models for which the shape of the power spectrum agrees with the large scale slope of the observed power spectrum. However requiring compatibility with observed CMBR anisotropies, the normalization of the power spectrum is too low for magnetic fields to have significant impact on the large scale structure at present. Magnetic fields of a more recent origin generically give density power spectrum / k4 which doesn?t agree with the shape of the observed power spectrum at any scale. Magnetic fields generate curl modes of the velocit y field which increase both the quadrupole and hexadecapole of the redshift space power spectrum. For curl modes, the hexadecapole dominates over quadrupole. So the presence of curl modes could be indicated by an anomalously large hexadecapole, which has not yet been computed from observation.
It appears difficult to construct models in which tangled magnetic fields could have played a major role in shaping the large scale structure in the present epoch. However if they did, one of the best ways to infer their presence would be from the redshift space effects in the density power spectrum.

Affiliated with

Also associated with

No associations

Rating

Large Scale Magnetic Fields: Density Power Spectrum in Redshift Space 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 Large Scale Magnetic Fields: Density Power Spectrum in Redshift Space, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Large Scale Magnetic Fields: Density Power Spectrum in Redshift Space will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-880575