scholarly journals Effects of helical magnetic fields on the cosmic microwave background

2012 ◽  
Vol 85 (8) ◽  
Author(s):  
Kerstin E. Kunze
Keyword(s):  
Magnetic Fields ◽  
Cosmic Microwave Background ◽  
Microwave Background

scholarly journals Probing Intracluster Magnetic Fields with Cosmic Microwave Background Polarization

2003 ◽  
Vol 584 (2) ◽  
pp. 599-607 ◽  
Author(s):  
Hiroshi Ohno ◽  
Masahiro Takada ◽  
Klaus Dolag ◽  
Matthias Bartelmann ◽  
Naoshi Sugiyama
Keyword(s):  
Magnetic Fields ◽  
Cosmic Microwave Background ◽  
Microwave Background ◽  
Cosmic Microwave Background Polarization

scholarly journals Primordial magnetism in CMB B modes

2013 ◽  
Vol 91 (6) ◽  
pp. 451-454 ◽  
Author(s):  
Levon Pogosian ◽  
Tanmay Vachaspati ◽  
Amit Yadav
Keyword(s):  
Magnetic Fields ◽  
Cosmic Microwave Background ◽  
Frequency Dependence ◽  
Faraday Rotation ◽  
Characteristic Frequency ◽  
Mode Coupling ◽  
Microwave Background ◽  
Small Scales ◽  
Cmb Polarization ◽  
Primordial Magnetic Fields

Cosmic microwave background (CMB) polarization B modes induced by Faraday rotation (FR) can provide a distinctive signature of primordial magnetic fields because of their characteristic frequency dependence and because they are only weakly damped on small scales. FR also leads to mode-coupling correlations between the E- and B-type polarizations and between the temperature and the B mode. These additional correlations can further help distinguish magnetic fields from other sources of B modes. We review the FR-induced CMB signatures and present the constraints on primordial magnetism that can be expected from upcoming CMB experiments. Our results suggest that FR of CMB will be a promising probe of primordial magnetic fields.

scholarly journals Magnetic fields from cosmological bulk flows

2020 ◽  
Vol 497 (3) ◽  
pp. 3537-3541
Author(s):  
J A R Cembranos ◽  
A L Maroto ◽  
H Villarrubia-Rojo
Keyword(s):  
Magnetic Fields ◽  
Cosmic Microwave Background ◽  
Galaxy Formation ◽  
Relative Velocity ◽  
Background Level ◽  
Bulk Flow ◽  
Microwave Background ◽  
Boltzmann Equations ◽  
First Order ◽  
Dynamo Mechanism

ABSTRACT We explore the possibility that matter bulk flows could generate the required vorticity in the electron–proton–photon plasma to source cosmic magnetic fields through the Harrison mechanism. We analyse the coupled set of perturbed Maxwell and Boltzmann equations for a plasma in which the matter and radiation components exhibit relative bulk motions at the background level. These background bulk motions induce a relative velocity between the matter and cosmic microwave background rest frames at the present time, i.e. a bulk flow, with an amplitude β. We find that, to first order in cosmological perturbations, bulk flows with velocities compatible with current Planck limits (β < 8.5 × 10−4 at $95{{\ \rm per\ cent}}$ CL) could generate magnetic fields with an amplitude 10−21 G on 10 kpc comoving scales at the time of completed galaxy formation that could be sufficient to seed a galactic dynamo mechanism.

Cosmic microwave background bispectrum of vector modes induced from primordial magnetic fields

2010 ◽  
Vol 82 (12) ◽  
Author(s):  
Maresuke Shiraishi ◽  
Daisuke Nitta ◽  
Shuichiro Yokoyama ◽  
Kiyotomo Ichiki ◽  
Keitaro Takahashi
Keyword(s):  
Magnetic Fields ◽  
Cosmic Microwave Background ◽  
Microwave Background ◽  
Primordial Magnetic Fields
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