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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)

- Paul Bostock, Ruth Gregory, Ignacio Navarro, Jose Santiago
- Physical review letters
- 2004

We look at general brane worlds in six-dimensional Einstein-Gauss-Bonnet gravity. We find the general matching conditions for the brane world, which remarkably give precisely the four-dimensional Einstein equations for the brane, even when the extra dimensions are noncompact and have infinite volume. Relaxing regularity of the curvature in the vicinity of… (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)