94 research outputs found
Quantization Near Violent Singularities in Einstein-Yang-Mills Black Holes
Classical singularities inside black holes in the Einstein-Yang-Mills theory
exhibit unusual features. Only for discrete values of the black hole mass one
encounters singularities of the Schwarzschild type (timelike) and the
Reissner-Nordstrom type (spacelike). For a generic mass the approach to
singularity is not smooth: the metric oscillates with an infinitely growing
amplitude and decreasing period. In spite of some similarity with the BKL
oscillations, here the behavior is not chaotic. However the oscillation
amplitude exceeds classical limits after few cycles, so the question arises how
this behavior gets modified by quantum effects. We discuss this issue both in
the framework of QFT and in the string theory.Comment: 2 pages, Contribution to the 9th Marcel Grossmann meeting (MG9),
Rome, July 200
Kramer--Neugebauer Transformation for Einstein--Maxwell--Dilaton--Axion Theory
The Kramer--Neugebauer--like transformation is constructed for the stationary
axisymmetric D=4 Einstein--Maxwell--dilaton--axion system. This transformation
directly maps the dualized sigma--model equations of the theory into the
nondualized ones. Also the new chiral matrix representation of the
problem is presented.Comment: 13 pages, RevTex, no figure
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