| Name: | Arpan Krishna Mitra |
| Affiliation: | Harish Chandra Research Institute |
| Conference ID : | ASI2023_733 |
| Title : | Wormhole in Analogue Spacetime of Accreting Fluid |
| Authors : | ARPAN KRISHNA MITRA, SUSOBHAN MAITY, TAPAS KUMAR DAS, SUBIR GHOSH |
| Mode of Presentation: | Poster |
| Abstract Category : | General Relativity and Cosmology |
| Abstract : | For general relativistic black hole accretion in the Kerr metric, linear perturbation of the axially symmetric matter flow leads to the emergence of black hole like acoustic spacetime. For different parameters characterizing the flow, the characteristic of the phase portrait of flow can be constructed. For such flow, the fluid equations may be perturbed and the corresponding emergent spacetime can be obtained such that the propagation of first order perturbation in these space times can be analyzed in a way similar to the propagation of light as analyzed in a spacetime using causal structure. We present the Penrose Carter formalism to analyze the emergent metric and the aforementioned propagation. Certain special flows with parameters at the boundary of the parameter space are also studied in this context. Analogue spacetime corresponding to accretion flow with shock is shown to be endowed with one white hole like sonic horizon flanked by two black hole like acoustic horizons. The problem of separation of two regions in the Penrose Carter diagram of this flow, and thus the inconclusive presence of white hole is solved by considering the extremely thin but finite width of shock. The shock is established to be the acoustic white hole. The resemblance of such a special kind of space-time with a wormhole is established. |
