Small-scale CMB polarization anisotropies due to tangled primordial magnetic fields

Details Small-scale CMB polarization anisotropies due to tangled primordial magnetic fields Small-scale CMB polarization anisotropies due to tangled primordial magnetic fields

2003-03-02

arxiv.org/abs/astro-ph/0303014v2

Mon.Not.Roy.Astron.Soc. 344 (2003) L31

Astronomy and Astrophysics

Astrophysics

5 pages, 2 figures, replaced with version accepted in MNRAS Letters

Scientific paper

10.1046/j.1365-8711.2003.07003.x

Tangled, primordial cosmic magnetic fields create small rotational velocity perturbations on the last scattering surface (LSS) of the cosmic microwave background radiation (CMBR). Such perturbations can contribute significantly to the CMBR temperature and polarization anisotropies at large l > 1000 or so, like the excess power detected by the CBI experiment. The magnetic contribution can be distinguished from most conventional signals, as they lead to CMBR polarization dominated by the odd parity, B-type signal. Experiments like DASI and WMAP have detected evidence for CMBR polarization at small l. Many experiments will also probe the large $l$ regime. We therefore calculate the polarization signals due to primordial magnetic fields, for different spectra and different cosmological parameters. A scale-invariant spectrum of tangled fields which redshifts to a present value B_{0}=3\times 10^{-9} Gauss, produces B-type polarization anisotropies of order 0.3 - 0.4 micro Kelvin between l of 1000-5000. Larger signals result if the spectral index of magnetic tangles is steeper, n>-3. The peak of the signal shifts to larger l for a lambda-dominated universe, or if the baryon density is larger. The signal will also have non-Gaussian statistics. We also predict the much smaller E-type polarization, and T-E cross correlations for these models.

Affiliated with

Also associated with

No associations

Rating

Small-scale CMB polarization anisotropies due to tangled primordial magnetic fields 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 Small-scale CMB polarization anisotropies due to tangled primordial magnetic fields, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Small-scale CMB polarization anisotropies due to tangled primordial magnetic fields will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-381462