Researchers from the Inter-University Centre for Astronomy and Astrophysics (IUCAA), Pune, and the University of KwaZulu-Natal (UKZN), Durban, have identified that for a black hole to maintain a stable horizon while absorbing matter, it must emit a type of radiation known as “Vaidya Radiation.” This insight, published in the journal Physical Review D (Letters), links to classical predictions made by Indian physicist Prahlad Vaidya in the 1940s.

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Findings sggest Vaidya Radiation is essential for black holes to maintain stability.
Theory helps explain how a black hole can keep its horizon unstretched even as matter falls in.
Vaidya Radiation, a classical form, supports quantum Hawking Radiation emission.
Black holes release Vaidya Radiation from heat caused by tidal forces as matter approaches.
Vaidya Radiation is vital for Hawking Radiation to propagate, ensuring black hole’s “evaporation.”
Heat generated from matter’s tidal deformations must radiate outward to stabilize the horizon.
This outward radiation ensures the black hole’s surface achieves a photon-like, stable character.
Vaidya Radiation theory provides a new view of accreting black holes beyond Hawking Radiation.
Dadhich and Goswami’s work brings clarity to how black holes retain their “black” nature.
The findings offer potential insights into the interplay between classical and quantum physics in black holes.