Sprecher Dr. Dennis D. Dietrich, Goethe-University, Frankfurt am Main
Ort FIAS, Room 0.200, Frankfurt (Main), Germany
Datum 23.07.2015 @ 15:28
Beschreibung Recently, I have shown how an AdSd+1 description of d dimensional gauge field theories arises readily in the worldline formalism of quantum field theory. In this talk I will dicuss the role the AdS black hole plays in this worldline based approach to holography.
The Nature of Trapping Horizons in Collapses Forming Black Holes
Sprecher Dr. Ilia Musco, CNRS, Observatoire de Paris/Meudon - LUTH
Ort FIAS, Room 0.200, Frankfurt (Main), Germany
Datum 23.07.2015 @ 16:04
Beschreibung In the context of gravitational collapse to form a black hole, one sees the appearance of inner and outer trapping horizons (foliated by marginally trapped surfaces), as was already noted in numerical calculations in the 1960s. This phenomenology has acquired new interest in connection with discussions of the Hayward unified first law of black hole dynamics. We have investigated the nature of the inner and outer horizons (ie whether they are spacelike, timelike or null), making contact with the Misner-Sharp formalism used in calculations for collapse of spherically symmetric fluid configurations to form black holes. By means of numerical simulations, we have followed the R=2M condition dynamically during the gravitational collapse, and have found that the nature of these trapping horizons is given by a very simple expression depending on the equation of state. Whether they are spacelike or timelike plays an important role in in classical depletion and quantum evaporation of black holes because only timelike or null horizons allow particles to pass through. We have observed different behaviours for the cases of stellar collapse and primordial black hole formation within an expanding Universe, resulting from the different nature of the matter involved. In this talk we will present results from our investigations.
Gravitational tests of the Generalized Uncertainty Principle
Sprecher Dr. Fabio Scardigli, A.U.M., Kuwait & Politecnico di Milano, Italy
Ort FIAS, Room 0.200, Frankfurt (Main), Germany
Datum 23.07.2015 @ 16:33
Beschreibung We compute the corrections to the Schwarzschild metric necessary to reproduce the Hawking temperature derived from a Generalized Uncertainty Principle (GUP), so that the GUP deformation parameter is directly linked to the deformation of the metric. Using this modified Schwarzschild metric, we compute corrections to the standard General Relativistic predictions for the light deflection and perihelion precession, both for planets in the solar system and for binary pulsars. This analysis allows us to set bounds for the GUP deformation parameter from well-known astronomical measurements.
