2023 Choked accretion onto Kerr-Sen black holes in Einstein-Maxwell-Dilation-Axion gravity

We study the choked accretion process of an ultrarelativistic fluid onto axisymmetric Kerr-Sen black holes in Einstein-Maxwell-Dilation-Axion theory. We calculate the solution describing the velocity potential Φ of a stationary, irrotational fluid, which satisfies the stiff equation of state and draw the streamlined diagram of the quadrupolar flow solution. We investigate how parameters affect the solution’s coefficient and stagnation point. The injection rate, ejection rate, and critical angle are discussed in detail at the end of the article. If the inner and outer event horizons of the black hole are satisfied, then we can find that the ratio of the ejection rate to the setting rate increases with an increase in the dilation parameter.

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