Hawking  Radiation of Dilatonic Black Hole in the Extremal Limit

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Abbasi, Navid | 2009

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Type of Document: M.Sc. Thesis
Language: Farsi
Document No: 39692 (04)
University: Sharif University of Technology
Department: Physics
Advisor(s): Arfaei, Hesammeddin
Abstract:
When we consider Klein-Gordon and Maxwell perturbation fields on the constant gravitational background, the Einstein-Maxwell equations solution will lead to Reissner-Nordstrom black hole which has decreasing mass because of Hawking radiation of bosons from its outer horizon; by reaching this balck hole to extremal case the evaporation will be stoped. The evaporation time is infinite. But String theory equations solution in General Relativity approximation shows that [11] if a Dilaton field ϕ has a exp⁡(-αϕ) coupling with electromagnetic field, the rate of reaching to extremal case will depend on α. We show that by increasing α from 0 to 1, the evaporation time will be initially infinite but if α be greater than a boundary value which is founded by our calculation, the time evaporation will be finite.
Keywords:
Hawking Radiation ; Boson ; Extremal Case ; Dilaton ; Evaporation Time

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