scholarly journals PRIMORDIAL MAGNETIC FIELDS BY COSMIC INFLATION

2012 ◽  
Vol 12 ◽  
pp. 264-271
Author(s):  
SHU-LIN CHENG ◽  
WO-LUNG LEE ◽  
KIN-WANG NG
Keyword(s):  
Magnetic Field ◽  
Magnetic Fields ◽  
Cosmic Microwave Background ◽  
Quadrupole Moment ◽  
Microwave Background ◽  
Cosmic Inflation ◽  
Slow Roll ◽  
Primordial Magnetic Fields ◽  
Primordial Magnetic Field ◽  
Spinodal Instability

Contrary to the conventional wisdom, we find that it is plausible to generate primordial magnetic seed fields via spinodal instability efficiently during cosmic inflation provided that a fast-roll stage is involved before the inflaton entering into the slow-roll phase. Moreover, the primordial magnetic field produced in such a mechanism can be used to constrain the low quadrupole moment of Cosmic Microwave Background.

scholarly journals Effects of primordial magnetic fields on CMB

2014 ◽  
Vol 10 (S306) ◽  
pp. 159-161 ◽  
Author(s):  
Héctor J. Hortúa ◽  
Leonardo Castañeda
Keyword(s):  
Magnetic Field ◽  
Perturbation Theory ◽  
Magnetic Fields ◽  
Large Scale ◽  
Unsolved Problem ◽  
Microwave Background ◽  
Cosmological Perturbation ◽  
Cosmological Perturbation Theory ◽  
Primordial Magnetic Fields ◽  
Primordial Magnetic Field

AbstractThe origin of large-scale magnetic fields is an unsolved problem in cosmology. In order to overcome, a possible scenario comes from the idea that these fields emerged from a small primordial magnetic field (PMF), produced in the early universe. This field could lead to the observed large-scales magnetic fields but also, would have left an imprint on the cosmic microwave background (CMB). In this work we summarize some statistical properties of this PMFs on the FLRW background. Then, we show the resulting PMF power spectrum using cosmological perturbation theory and some effects of PMFs on the CMB anisotropies.

scholarly journals Tracing Primordial Magnetic Fields with 21 cm Line Observations

Galaxies ◽  
2019 ◽  
Vol 7 (1) ◽  
pp. 37 ◽  
Author(s):  
Kerstin Kunze
Keyword(s):  
Magnetic Field ◽  
Magnetic Fields ◽  
Cosmic Microwave Background ◽  
Large Scale ◽  
Numerical Solutions ◽  
Gaussian Random Field ◽  
Microwave Background ◽  
Matter Power Spectrum ◽  
Primordial Magnetic Fields ◽  
The Universe

Magnetic fields are observed on a large range of scales in the universe. Up until recently, the evidence always pointed to magnetic fields associated with some kind of structure, from planets to clusters of galaxies. Blazar observations have been used to posit the first evidence of truly cosmological magnetic fields or void magnetic fields. A cosmological magnetic field generated in the very early universe before recombination has implications for the cosmic microwave background (CMB), large scale structure as well as the 21 cm line signal. In particular, the Lorentz term causes a change in the linear matter power spectrum. Its implication on the 21 cm line signal was the focus of our recent simulations which will be summarised here. Modelling the cosmological magnetic field as a gaussian random field numerical solutions were found for magnetic fields with present day amplitudes of 5 nG and negative spectral indices which are within the range of observational constraints imposed by the cosmic microwave background (CMB).

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.

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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