Effect of the cosmological constant in the Hawking radiation of 3D charged dilaton black hole

Abstract

This paper deals with the semiclassical radiation spectrum of static and circularly symmetric 3D charged dilaton black holes with cosmological constant Λ in non-asymptotically flat spacetimes. We first review the 3D charged dilaton black holes which are solution to low-energy string action. The wave equation of a massless scalar field is shown to be exactly solvable in terms of hypergeometric functions. Thus, the radiation spectrum and its corresponding temperature are obtained, precisely. Computations at high frequency regime show that the radiation spectrum yields the Hawking temperature of the black hole with no charge. Unlike the chargeless case, the Hawking temperature of the charged dilaton black holes is derived from the radiation spectrum at the low frequencies. The utmost importance of the Λ in the latter result is highlighted.

References in corpus (3)

• Quasinormal Modes of Charged Scalars around Dilaton Black Holes in 2+1 Dimensions: Exact Frequencies
• Hawking radiation of linear dilaton black holes
• Effect of the Born-Infeld Parameter in higher dimensional Hawking radiation

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• Emergent GUP from Modified Hawking Radiation in Einstein-NED Theory