Baryon-Dark matter interaction in presence of magnetic fields in light of EDGES signal

Understand

We have shown that in presence of a cosmic magnetic field the bounds on baryon dark matter cross-section ($\hat \sigma$), dark-matter mass ($m_d$) and values of the magnetic field ($B_0$) can strongly influence each other.

• This requires to rework the bounds on $\hat \sigma\,$, $m_d$ and $B_0$ which can explain the observed absorption signal by EDGES collaboration.
• The upper limit on the magnetic field strength can modify in presence of baryon-dark matter interaction cross-section.
• In the presence of a strong magnetic field, a large baryon-dark matter interaction cross-section is required to balance magnetic heating of gas to explain the EDGES signal as compared to a weak magnetic field.