Greybody factor for quintessential Kerr–Newman black hole

Publication date: Available online 14 December 2019Source: Physics of the Dark UniverseAuthor(s): M. Sharif, Qanitah Ama-Tul-MughaniAbstractIn this paper, we formulate an analytic expression of the greybody factor for the Kerr–Newman black hole in the presence of the quintessential field. Primarily, we analyze the profile of effective potential by transforming the radial equation of motion into standard Schrödinger form through tortoise coordinate. The two asymptotic solutions, in the form of hypergeometric functions, are computed at distinct radial regions such as a black hole and cosmological horizons determined by the quintessence. To extend the viability over the whole radial regime, we match the analytical solutions smoothly in an intermediate region by using a semi-classical approach. We also calculate the emission rates and absorption cross-section for the massless scalar fields to elaborate on the significance of our result. It is found that the electromagnetic force together with the gravitational pull of black hole maximizes the effective potential and consequently, decreases the emission process of scalar field particles.

Source: Physics of the Dark Universe - December 15, 2019 Category: Physics Source Type: research