scholarly journals Insight into primordial magnetic fields from 21-cm line observation with EDGES experiment

2019 ◽  
Vol 488 (2) ◽  
pp. 2001-2005 ◽  
Author(s):  
Teppei Minoda ◽  
Hiroyuki Tashiro ◽  
Tomo Takahashi
Keyword(s):  
Magnetic Fields ◽  
Thermal Evolution ◽  
Recent Observation ◽  
Microwave Background ◽  
Strong Constraint ◽  
Absorption Signal ◽  
Stringent Limit ◽  
Primordial Magnetic Fields ◽  
Insight Into ◽  
Line Observation

Abstract The recent observation of the 21-cm global absorption signal by EDGES suggests that the intergalactic medium (IGM) gas has been cooler than the cosmic microwave background during 15 ≲ z ≲ 20. This result can provide a strong constraint on heating sources for the IGM gas at these redshifts. In this paper we study the constraint on the primordial magnetic fields (PMFs) by the EDGES result. The PMFs can heat the IGM gas through their energy dissipation due to the magnetohydrodynamic effects. By numerically solving the thermal evolution of the IGM gas with the PMFs, we find that the EDGES result gives a stringent limit on the PMFs as B1 Mpc ≲ 10−10 G.

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

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.

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