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All Outputs (50)

DGP specteroscopy (2006)
Journal Article
Charmousis, C., Gregory, R., Kaloper, N., & Padilla, A. (2006). DGP specteroscopy. Journal of High Energy Physics, 2006(10), https://doi.org/10.1088/1126-6708/2006/10/066

We systematically explore the spectrum of gravitational perturbations in codimension-1 DGP braneworlds, and find a 4D ghost on the self-accelerating branch of solutions. The ghost appears for any value of the brane tension, although depending on the... Read More about DGP specteroscopy.

Einstein gravity on the codimension 2 brane? (2004)
Journal Article
Bostock, P., Gregory, R., Navarro, I., & Santiago, J. (2004). Einstein gravity on the codimension 2 brane?. Physical Review Letters, 92, https://doi.org/10.1103/physrevlett.92.221601

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... Read More about Einstein gravity on the codimension 2 brane?.

Spacetime decay of cones at strong coupling (2003)
Journal Article
Gregory, R., & Harvey, J. (2003). Spacetime decay of cones at strong coupling. Classical and Quantum Gravity, 20(19), L231-L237. https://doi.org/10.1088/0264-9381/20/19/101

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 tachy... Read More about Spacetime decay of cones at strong coupling.

Nested braneworlds and strong brane gravity (2002)
Journal Article
Gregory, R., & Padilla, A. (2002). Nested braneworlds and strong brane gravity. Physical Review D, Particles and fields, 65, https://doi.org/10.1103/physrevd.65.084013

We find the gravitational field of a ‘‘nested’’ domain wall living entirely within a brane-universe, or, a localized vortex within a wall. Using two illustrative examples, a vortex living on a critical Randall-Sundrum brane universe and a nested Rand... Read More about Nested braneworlds and strong brane gravity.

Self-gravity of brane worlds: a new hierarchy twist (2001)
Journal Article
Charmousis, C., Emparan, R., & Gregory, R. (2001). Self-gravity of brane worlds: a new hierarchy twist. Journal of High Energy Physics, 2001(05), https://doi.org/10.1088/1126-6708/2001/05/026

We examine the inclusion of brane self-gravity in brane-world scenarios with three or more compact extra dimensions. If the brane is a thin, localized one, then we find that the geometry in its vicinity is warped in such a way that gravity on the bra... Read More about Self-gravity of brane worlds: a new hierarchy twist.