| Name: Kalyanbrata Pal |
| Affiliation: Harish-Chandra Research Institute |
| Conference ID: ASI2026_865 |
| Title: Black hole accretion in axially symmetric space time as an analogue gravity model |
| Abstract Type: Poster |
| Abstract Category: High Energy Phenomena, Fundamental Physics and Astronomy |
| Author(s) and Co-Author(s) with Affiliation: Kalyanbrata Pal(Harish-Chandra Research Institute) |
| Abstract: We investigate accretion of low angular momentum inviscid hydrodynamical flow for various disk geometry around a Kerr black hole. We formulate and solve the hydrodynamical equations governing the flow and obtain the corresponding stationary integral multi transonic accretion solutions containing shock. We have obtained the multi transonic solution for a steady accretion flow around the black hole. But large scale astrophysical flow onto the black holes are, however, vulnerable to various perturbative events (e.g. star disk interaction). Therefore we have analysed the stability of the accreting matter by perturbing the steady flow. Perturbation of the transonic accretion flow leads to the emergence of a special kind of space time metric, that illustrate the propagation of the perturbation inside the flowing fluid. For linear perturbation the aforementioned space time metric describes the propagation of the acoustic perturbation inside the accretion flow and is called the sonic or acoustic metric. In this work, we also identify the sonic horizon associated with the sonic metric, which is conformally equivalent to a particular representation of the Schwarzschild metric, and study this analogue spacetime in detail using the Carter-Penrose diagram.
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