https://doi.org/10.1140/epjc/s10052-021-09155-z
Regular Article - Theoretical Physics
Constraint on primordial magnetic fields in the light of ARCADE 2 and EDGES observations
1
Physical Research Laboratory, Theoretical Physics Division, 380 009, Ahmedabad, India
2
Department of Physics, Indian Institute of Technology, 382 424, Gandhinagar, India
Received:
10
December
2020
Accepted:
18
April
2021
Published online:
6
May
2021
We study the constraints on primordial magnetic fields (PMFs) in the light of the Experiment to Detect the Global Epoch of Reionization Signature (EDGES) low-band observation and Absolute Radiometer for Cosmology, Astrophysics and Diffuse Emission (ARCADE 2). ARCADE 2 observation detected extra-galactic excess radio radiation in the frequency range 3–90 GHz. The enhancement in the radio radiation is also supported by the first station of the Long Wavelength Array (LWA1) in the frequency range 40–80 MHz. The presence of early radiation excess over the cosmic microwave background can not be completely ruled out, and it may explain the EDGES anomaly. In the presence of decaying PMFs, 21 cm differential brightness temperature can modify due to the heating of the gas by decaying magnetic fields, and we can constraint the magnetic fields. For excess radiation fraction (
) to be LWA1 limit, we show that the upper bound on the present-day magnetic field strength, 
, on the scale of 1 Mpc is 
nG for spectral index 
. While for 
, we get 
nG. We also discuss the effects of first stars on IGM gas evolution and the allowed value of . For to be LWA1 limit, we get the upper constraint on magnetic field to be 
nG and 
nG. By decreasing excess radiation fraction below the LWA1 limit, we get a more stringent bound on .
© The Author(s) 2021
Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/.
Funded by SCOAP3
