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A fundamental string with non-zero winding number can unwind in the presence of a Kaluza-Klein monopole. We use this fact to deduce the presence of a zero mode for the Kaluza-Klein monopole corresponding to excitations carrying H-electric charge and we study the coupling of this zero mode to fundamental strings. We also a describe a T-dual process in which… (More)

- R Gregory, V A Rubakov, S M Sibiryakov
- Physical review letters
- 2000

The standard picture of viable higher-dimensional theories is that direct manifestations of extra dimensions occur at short distances only, whereas long-distance physics is effectively four-dimensional. We show that this is not necessarily true in models with infinite extra dimensions. As an example, we consider a five-dimensional scenario with three… (More)

- Ruth Gregory
- 2000

We show how to extend the usual black string instability of vacuum or charged black p-branes to the anti-de Sitter background. The string fragments in an analogous fashion to the Λ = 0 case, the main difference being that instead of a periodic array of black holes forming, an accumulation of " mini " black holes occurs towards the AdS horizon. In the case… (More)

- Ruth Gregory
- 2000

We consider an exotic 'compactification' of spacetime in which there are two infinite extra dimensions, using a global string instead of a domain wall. By having a negative cosmological constant we prove the existence of a nonsin-gular static solution using a dynamical systems argument. A nonsingular solution also exists in the absence of a cosmological… (More)

- Peter Bowcock, Christos Charmousis, Ruth Gregory
- 2000

Starting from a completely general standpoint, we find the most general brane-Universe solutions for a three-brane in a five dimensional spacetime. The brane can border regions of spacetime with or without a cosmological constant. Making no assumptions other than the usual cosmological symmetries of the metric, we prove that the equations of motion form an… (More)

- Peter Kornerup, R. T. Gregory
- BIT
- 1983

We study time dependent solutions in dilaton gravity which correspond to the decay of conical spacetimes. In string theory this can be interpreted as a strong coupling limit of the decay of a non-supersymmetric orbifold spacetime with localized tachyons.

- Christos Charmousis, Ruth Gregory
- 2004

We consider axially symmetric static metrics in arbitrary dimension, both with and without a cosmological constant. The most obvious such solutions have an SO(n) group of Killing vectors representing the axial symmetry, although one can also consider abelian groups which represent a flat 'internal space'. We relate such metrics to lower dimensional… (More)

The modifications of dilaton black holes which result when the dilaton acquires a mass are investigated. We derive some general constraints on the number of horizons of the black hole and argue that if the product of the charge Q of the black hole and the dilaton mass m satisfies Qm < O(1) then the black hole has only one horizon. We also argue that for Qm… (More)

- Ruth Gregory, Randall Sundrum
- 2008

In these lectures, I give an introduction to and overview of braneworlds and black holes in the context of warped compactifications. I first describe the general paradigm of braneworlds, and introduce the Randall-Sundrum model. I discuss braneworld gravity, both using perturbation theory, and also non perturbative results. I then discuss black holes on the… (More)