We examined the properties of the circular orbits in these spacetimes. In the case of Black Holes, ultra high frequency radiation is ruled out theoretically. Our idea proposes that if a suitable Naked Singularity model is used, then that produces emissions of light frequencies in very high frequency and radio bands. These are captured with the help of several radio telescopes around the world. An Accretion Disk is swirling matter that moves swiftly around a massive body in space. In the new idea we have proposed and supported, we have examined Accretion Disks around Black Holes and Naked Singularities. Understanding Accretion Disks and Their Significance These results would allow us to decide whether the object sitting at the centre of our galaxy is a Black Hole or a Naked Singularity. In light of these recent developments, our recent paper published in the journal Physical Review D, ‘Comparing thin accretion disks around black holes and naked singularities’, by Tahelayani et al, reports several interesting further results. This was a significant recognition of the JMN model by modern observational data. It was seen that the observed data fit well with this model, which one of the EHT papers described as the “best possible black hole mimicker”. On the other hand, the Naked Singularity has no Event Horizon and, therefore, we can get, in principle, the signals and information of the physical phenomena happening in the Ultra compact regions of the universe. It is kind of a Black Box sitting out there in space. However, the difference between the two is that the Black Hole has a one-way membrane called an Event Horizon which does not allow any information to escape away from its vicinity. In particular, they examined the Naked Singularity model given earlier in 2011 by Joshi, Malafarina, and Narayan, called the JMN model.īoth Black Holes and Naked Singularities model Ultra compact objects where an enormous amount of matter is compacted in a very small region of space. This situation prompted the scientists to look for scenarios other than the black hole model. Additionally, the angle or the tilt of the image was quite different as compared to what would be predicted by a black hole model. Various problems came up in explaining the intensity distribution of light across the image that was obtained by the Event Horizon Telescope. Interestingly the black hole model did not work as well as it should have. They also tried to model, explain, and understand the data using the possibility of a black hole sitting at the centre of our galaxy. That very day, the Event Horizon Telescope collaboration also released a series of seven detailed papers outlining the entire procedure and the methodology they used to obtain this image from the given data with the help of an array of radio telescopes across the globe. It showed a wonderful image and a shadow-like structure for this ultra-compact object at the Galactic centre. On May 12, 2022, the Event Horizon Telescope collaboration released its data and the photograph and images of Sgr A* in a widely publicised press conference in Washington DC. Pankaj Joshi, Distinguished Professor of Physics and Director of the International Centre for Space and Cosmology, explains that new studies he led at the Centre provide greater evidence supporting the Naked Singularity theory. At the Heart of the Galactic Centre: Black Hole or Naked Singularity?Ī deep mystery is unfolding on the true nature of the Ultra dense object Sgr A* at the galactic centre.
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