ar X iv : h ep - t h / 95 10 12 3 v 1 1 8 O ct 1 99 5 INJE – TP – 95 – 3 An infinite number of potentials surrounding 2 d black hole

ar X iv : h ep - t h / 95 10 12 2 v 1 1 8 O ct 1 99 5 INJE – TP – 95 – 2 Blueshift of tachyon in the charged 2 D black hole

We study the propagation of string fields (metric Gμν , Mawxell gauge potential Aμ, dilaton Φ, and tachyon T ) in a two-dimensional (2D) charged black hole. It is shown that the tachyon is a propagating field both inside and outside the black hole. This becomes infinitely blueshifted at the inner horizon. We confirm that the inner horizon is unstable, whereas the outer horizon is stable. PACS n...

ar X iv : h ep - t h / 95 10 12 7 v 4 1 4 D ec 1 99 5 INJE – TP – 95 – 8 Two - dimensional extremal black holes

We discuss the two-dimensional (2D), ǫ < 2 extremal ground states of charged black hole. Here ǫ is the dilaton coupling parameter for the Maxwell term. The complete analysis of stability is carried out for all these extremal black holes. It is found that they are all unstable. To understand this instability, we study the non-extremal charged black hole with two (inner and outer) horizons. The e...

ar X iv : h ep - t h / 99 03 05 4 v 2 2 0 O ct 1 99 9 INJE - TP - 99 - 2 Scattering from an AdS 3 bubble and an exact AdS

ar X iv : h ep - t h / 98 03 22 7 v 1 2 7 M ar 1 99 8 INJE - TP - 98 - 3 Probing the BTZ black hole with test fields

We introduce a set of scalar fields as test fields to study the dynamical behaviors of the BTZ(Banados-Teitelboim-Zanelli) black hole. These include minimally coupled scalar, conformally coupled scalar, and dilaton. To calculate the decay rate of the BTZ black hole, we consider both the Dirichlet boundary condition at spatial infinity and the matching procedure. It turns out that the dilaton is...

ar X iv : h ep - t h / 96 10 03 1 v 1 7 O ct 1 99 6 INJE – TP – 96 – 5 Higher dimensional extremal black strings

We investigate the five and six-dimensional black strings within EinsteinMaxwell theory. The extremal black strings are endowed with the null Killing symmetry. We study the propagation of Einstein-Maxwell modes in the extremal black string background by using this symmetry. It turns out that one graviton is a propagating mode, while both the Maxwell(F) and three-form (H) fields are non-propagat...