CMB anisotropy due to tangled magnetic fields in reionized models

Journal Article · Fri Jul 15 04:00:00 EDT 2005 · Physical Review. D, Particles Fields

DOI:https://doi.org/10.1103/PhysRevD.72.023004· OSTI ID:20711102

Seshadri, T R ^[1]; Subramanian, Kandaswamy ^[2]

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1. Department of Physics and Astrophysics, University of Delhi, Delhi 110007 (India)
2. Inter-University Centre for Astronomy and Astrophysics, Post Bag 4, Ganeshkhind, Pune 411 007 (India)

Primordial tangled cosmological Magnetic Fields source rotational velocity perturbations of the baryon fluid, even in the post-recombination universe. These vortical modes inturn leave a characteristic imprint on the temperature anisotropy of the Cosmic Microwave Background (CMB), if the CMB photons can be rescattered after recombination. Observations from WMAP indicate that the Universe underwent a relatively early reionization (z{sub ri}{approx}15), which does indeed lead to a significant optical depth for rescattering of CMB photons after the reionization epoch. We compute the resulting additional temperature anisotropies, induced by primordial magnetic fields in the post-recombination universe. We show that in models with early reionization, a nearly scale-invariant spectrum of tangled magnetic fields which redshift to a present value of B{sub 0}{approx}3x10{sup -9} Gauss, produce vector mode perturbations which in turn induce additional temperature anisotropy of about 0.3 to 0.4 {mu}K over very small angular scales, with l upto {approx}10000 or so.

• OSTI ID: 20711102
• Journal Information: Physical Review. D, Particles Fields, Journal Name: Physical Review. D, Particles Fields Journal Issue: 2 Vol. 72; ISSN PRVDAQ; ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
ANISOTROPY
BARYONS
COSMOLOGY
DISTURBANCES
MAGNETIC FIELDS
PHOTONS
RECOMBINATION
RELICT RADIATION
RESCATTERING
UNIVERSE
VECTORS