Researchers from the Inter-University Centre for Astronomy and Astrophysics (IUCAA) in Pune and the University of KwaZulu-Natal (UKZN) in Durban have made a breakthrough discovery in black hole astrophysics. They found that for a black hole to maintain its structure while absorbing matter, it must emit a form of classical radiation called “Vaidya Radiation.”
The findings, published in the journal Physical Review D (Letters), were made by Rituparno Goswami of UKZN and Naresh Dadhich of IUCAA. The research builds upon the work of Indian physicist Prahlad Chunnilal Vaidya from the 1940s.
Our current research gives a new and novel prediction using it,” said Professor Dadhich. He explained that this phenomenon shows accreting black holes emitting Vaidya Radiation, which allows Hawking radiation to escape even as matter falls in. This process facilitates the quantum mechanical evaporation of the black hole.
While Hawking radiation is a well-known concept, the researchers pointed out that a critical condition must be met for it to occur while allowing a black hole to remain “black.” Previously, this condition was not well understood due to potential disruptions caused by infalling matter.
New insights into black hole behavior
The recent findings address this issue by showing that the black hole must radiate Vaidya Radiation to maintain equilibrium.
The research indicates that Vaidya Radiation in an accreting black hole is generated by heat from the tidal deformation of infalling matter. Goswami and Dadhich demonstrated that for the horizon to remain unstretched, the heat must be radiated outward as Vaidya Radiation. Remarkably, the energy radiated matches the energy needed for the horizon to stay unstretched, allowing it to acquire a photon-like character as matter reaches it.
“For a black hole to remain a black hole, the infalling fluid must be in consonance with fluid on the black hole horizon,” Dadhich explained. For that, it undergoes tidal deformations, giving out heat flux which manifests as classical Vaidya radiation emanating from the boundary of the accreting zone.
This groundbreaking research provides new insights into black hole mechanics and the complex interplay between classical and quantum phenomena in astrophysical settings. It paves the way for a deeper understanding of these enigmatic objects and their behavior.
Rashan is a seasoned technology journalist and visionary leader serving as the Editor-in-Chief of DevX.com, a leading online publication focused on software development, programming languages, and emerging technologies. With his deep expertise in the tech industry and her passion for empowering developers, Rashan has transformed DevX.com into a vibrant hub of knowledge and innovation. Reach out to Rashan at [email protected]
