State of the Universe

On the detection of a cosmic dawn signal in the radio background

by Dr Saurabh Singh (Raman Research Institute, Bangalore)

Asia/Kolkata
Zoom Meeting: https://us02web.zoom.us/j/82512956967?pwd=angyQ0ZDdHZUdzFUbjkybmxsWFNFUT09 Meeting ID: 825 1295 6967 Passcode: 384194

Zoom Meeting: https://us02web.zoom.us/j/82512956967?pwd=angyQ0ZDdHZUdzFUbjkybmxsWFNFUT09 Meeting ID: 825 1295 6967 Passcode: 384194

Description
EDGES collaboration reported detection of an anomalous profile, which was interpreted to be a 21-cm signature arising from cosmic dawn. Several non- standard theoretical models were proposed to explain its origins, including dark matter-baryon interactions and excess radio background. We deployed SARAS 3 radiometer on lakes in Southern India to examine this claim. In this talk, I will discuss the unique design and observing environment of SARAS 3. I will present the statistical methods used to test for the presence of the reported signal. I will conclude with our inference about the non-detection of the reported profile in SARAS 3 data and discuss its implications.