128 research outputs found
Black Hole Uncertainties
In this work the quantum theory of two dimensional dilaton black holes is
studied using the Wheeler De Witt equation. The solutions correspond to wave
functions of the black hole. It is found that for an observer inside the
horizon, there are uncertainty relations for the black hole mass and a
parameter in the metric determining the Hawking flux. Only for a particular
value of this parameter, can both be known with arbitrary accuracy. In the
generic case there is instead a relation which is very similar to the so called
string uncertainty relation.Comment: 22 pages, Changes: Additions to acknowledgements and reference
The Scattering of Strings in a Black-Hole Background
In this paper, correlation functions of tachyons in the two-dimensional
black-hole are studied. The results are shown to be consistent with the
prediction of the deformed matrix model.Comment: 10 pages, Latex, CERN-TH.7240/9
The Deformed Matrix Model at Finite Radius and a New Duality Symmetry
The deformed matrix model is studied at finite radius and
non-zero cosmological constant. Calculational techniques are presented and
illustrated in some examples. Furthermore, a new kind of
duality is discovered which mixes different genus.Comment: 11 pages, CERN-TH.7021/9
Fatal attraction: more on decaying anti-branes
We elaborate on the decay of branes inside throat geometries that are
supported by flux carrying charges opposite to the brane. Our main point is
that such backgrounds necessarily have a local, possibly diverging, pile up of
brane-charges dissolved in flux around the anti-brane due to the (fatal)
attraction of the flux towards the brane. We explain that this causes enhanced
brane-flux annihilation and is in tension with the idea that anti-branes can be
used to construct meta-stable vacua. We argue that stable configurations -- if
they at all exist -- are not obtainable within SUGR. The problem we point out
is already present when the back-reaction is confined in the IR and the
associated uplift energy small. Our results are valid in the regime that is
complementary to a recent analysis of Bena et. al.Comment: 24 pages, 5 figures, v2.: few typos correcte
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