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Hawking Radiation of Dilatonic Black Hole in the Extremal Limit
, M.Sc. Thesis Sharif University of Technology ; Arfaei, Hesammeddin (Supervisor)
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...
Greybody Factors of Spin ½ Particles in the Background of Dilaton Black Hole
, M.Sc. Thesis Sharif University of Technology ; Arfaei, Hessamaddin (Supervisor)
Abstract
Inthisthesiswe willuse curved space-time quantum mechanicsto solveDirac equationin the background of dilaton black hole. Graybodyfactors and Hawking radiation and evaporation rates of charged massive spin particles in the background of dilaton black holes is obtained. The results are analyzed and the lifetime of dilaton black hole in terms of different dilaton coupling constants is studied