Volume 82, Number 6, June 2008
|Number of page(s)||5|
|Published online||27 May 2008|
Fermion tunneling from dynamical horizons
Department of Physics-University of Toronto - 60 St. George Street, Toronto, Ontario, M5S 1A7, Canada
2 Dipartimento di Fisica-Università di Trento and INFN, Gruppo Collegato di Trento - Via Sommarive 14, 38100 Povo (Trento) Italia, EU
Corresponding author: email@example.com
Accepted: 24 April 2008
The instability against emission of fermionic particles by the trapping horizon of an evolving black hole is analyzed and confirmed using the Hamilton-Jacobi tunneling method. This method automatically selects one special expression for the surface gravity of a changing horizon. The results also apply to point masses embedded in an expanding universe. As a bonus of the tunneling method, we gain the insight that the surface gravity still defines a temperature parameter as long as the evolution is sufficiently slow that the black-hole pass through a sequence of quasi-equilibrium states, and that black holes should be semi-classically unstable even in a hypothetical world without bosonic fields.
PACS: 04.70.-s – Physics of black holes / 04.70.Bw – Classical black holes / 04.70.Dy – Quantum aspects of black holes, evaporation, thermodynamics
© EPLA, 2008
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