rri: Rri Telescope Refutes Mit-asu Claims Of Radio Signals From Cosmic Dawn | Bengaluru News

Bengaluru: Invented and constructed by astronomers on the Raman Analysis Institute (RRI), the SARAS-3 radio telescope has “conclusively refuted” a latest declare of the invention of a 21-cm radio wave sign from Cosmic Dawn, the time within the infancy of our Universe when the primary stars and galaxies got here into existence. US researchers from MIT and Arizona State College (ASU) had, utilizing information from EDGES radio telescope, beforehand claimed the detection and introduced it within the prestigious journal Nature. Whereas this created pleasure within the international astronomy neighborhood, the world awaited affirmation from impartial researchers.
Now, RRI’s Prof Ravi Subrahmanyan and Prof N Udaya Shankar have refuted the declare — which was hailed by Harvard astrophysicist Avi Loeb as worthy of two Nobel prizes — and revealed the findings in Nature Astronomy. EDGES is an experiment and radio telescope at Murchison Radio-astronomy Observatory in Western Australia. It’s a collaboration between ASU and Haystack Observatory, with infrastructure by CSIRO.
“SARAS-3, a niche high-risk high-gain experimental effort to detect extremely faint radio wave signals from the depths of time, from our ‘Cosmic Dawn’, is the first telescope worldwide to reach the required sensitivity. And contrary to expectations, it refuted MIT/AUS claims. This restores confidence in the understanding of the evolving Universe, re-establishing the prevailing cosmological model of the cosmos,” researchers mentioned.
After rigorous statistical evaluation led by RRI analysis scientist Saurabh Singh, SARAS-3 didn’t discover proof of the sign claimed by EDGES. “Presence of the signal is decisively rejected after careful assessment of measurement uncertainties. The finding implies that the detection reported by EDGES was likely contamination of their measurement and not a signal from Cosmic Dawn,” RRI mentioned. Having rejected the ASU/MIT declare, the SARAS experiment is geared in the direction of discovering the true nature of Cosmic Dawn and the RRI group is planning extra observations on distant lakes in India which it believes will enable them to detect the 21-cm sign from Cosmic Dawn and unravel this final remaining hole within the historical past of our Universe.”
The opposite researchers within the group are: Jishnu Nambissan T, BS Girish A Raghunathan R Somashekar, KS Srivani and Mayuri Sathyanarayana Rao.
Experiment & Science
Stating that its CMB Distortion Lab has pioneered state-of-the-art radio telescopes, RRI mentioned these devices are designed to detect faint cosmological indicators, particularly radiation emitted by hydrogen atoms on the 21-cm wavelength (1.4 GHz) arising from the depths of the cosmos. The sign from Cosmic Dawn is predicted to reach on Earth stretched in wavelength to metres and lowered in frequency by the enlargement of the Universe to lie within the radio frequency band 50-200 MHz, making detection tough, RRI mentioned.
“…It requires ingenuity in antenna and electronics design, exceptional care in construction, selection of observing site/s, and skill in statistical analysis. Our scientists and engineers have risen to the challenge. SARAS-3, meticulously designed and calibrated to discern such signals, was deployed in isolated sites to gather celestial radio waves with minimum terrestrial man-made radio interference,” RRI mentioned. It was first deployed in rural Timbaktu Collective in Anantapur district, a “community that ‘lives simply so others may simply live’,” and subsequent deployment was in Ladakh with logistics supported by the Indian Astronomical Observatory. “These expeditions yielded sensitive data that improved our knowledge of Cosmic Dawn by conclusively ruling out families of theoretical models hitherto believed possible,” RRI mentioned.
Water Deployment
Extra not too long ago, in a big innovation, RRI astronomers floated the SARAS-3 radio telescope on a raft on water — an clever design by no means conceived of on this planet earlier than — which considerably enhanced efficiency.The scientific cause for floating the telescope on the water was to offer a homogenous medium of excessive dielectric fixed beneath the antenna. “Such medium improves sensitivity, reduces confusing radio waves emitted by ground beneath telescopes. In an expedition in early 2020, it was deployed on Dandiganahalli lake and Sharavathi backwaters,” RRI added.
Dwelling in remoted rural DRIK Viveka campus of social employee Anita Reddy, RRI astronomers gathered essentially the most exact measurements so far. “The goal during this deployment was cross-verification of EDGES’ claim. The strength of the reported signal was bizarre compared to theoretical predictions; therefore, EDGES’ claim had led to speculations about how the Universe might be different compared to current understanding,” RRI mentioned.

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