Outputs (48)

Accelerating black holes in 2 + 1 dimensions: holography revisited (2023)
Journal Article
Arenas-Henriquez, G., Cisterna, A., Diaz, F., & Gregory, R. (2023). Accelerating black holes in 2 + 1 dimensions: holography revisited. Journal of High Energy Physics, 2023(9), Article 122. https://doi.org/10.1007/jhep09%282023%29122

This paper studies the holographic description of 2 + 1-dimensional accelerating black holes. We start by using an ADM decomposition of the coordinates suitable to identify boundary data. As a consequence, the holographic CFT lies in a fixed curved b... Read More about Accelerating black holes in 2 + 1 dimensions: holography revisited.

Thermodynamics of Many Black Holes (2021)
Journal Article
Gregory, R., Lim, Z. L., & Scoins, A. (2021). Thermodynamics of Many Black Holes. Frontiers in Physics, 9, Article 666041. https://doi.org/10.3389/fphy.2021.666041

We discuss the thermodynamics of an array of collinear black holes which may be accelerating. We prove a general First Law, including variations in the tensions of strings linking and accelerating the black holes. We analyse the implications of the F... Read More about Thermodynamics of Many Black Holes.

Hawking-Moss transition with a black hole seed (2020)
Journal Article
Gregory, R., Moss, I. G., Oshita, N., & Patrick, S. (2020). Hawking-Moss transition with a black hole seed. Journal of High Energy Physics, 2020(9), 1-14. https://doi.org/10.1007/jhep09%282020%29135

We extend the concept of Hawking-Moss, or up-tunnelling, transitions in the early universe to include black hole seeds. The black hole greatly enhances the decay amplitude, however, order to have physically consistent results, we need to impose a new... Read More about Hawking-Moss transition with a black hole seed.

Black holes, oscillating instantons and the Hawking-Moss transition (2020)
Journal Article
Gregory, R., Moss, I. G., & Oshita, N. (2020). Black holes, oscillating instantons and the Hawking-Moss transition. Journal of High Energy Physics, 2020(7), Article 024. https://doi.org/10.1007/jhep07%282020%29024

Static oscillating bounces in Schwarzschild de Sitter spacetime are investigated. The oscillating bounce with many oscillations gives a super-thick bubble wall, for which the total vacuum energy increases while the mass of the black hole decreases du... Read More about Black holes, oscillating instantons and the Hawking-Moss transition.

Connecting the Higgs potential and primordial black holes (2020)
Journal Article
Dai, D., Gregory, R., & Stojkovic, D. (2020). Connecting the Higgs potential and primordial black holes. Physical Review D, 101(12), Article 125012. https://doi.org/10.1103/physrevd.101.125012

It was recently demonstrated that small black holes can act as seeds for nucleating decay of the metastable Higgs vacuum, dramatically increasing the tunneling probability. Any primordial black hole lighter than 4.5 × 1014 g at formation would have e... Read More about Connecting the Higgs potential and primordial black holes.

Are “Superentropic” black holes superentropic? (2020)
Journal Article
Appels, M., Cuspinera, L., Gregory, R., Krtouš, P., & Kubizňák, D. (2020). Are “Superentropic” black holes superentropic?. Journal of High Energy Physics, 2020(2), Article 195. https://doi.org/10.1007/jhep02%282020%29195

We study a critical limit in which asymptotically-AdS black holes develop maximal conical deficits and their horizons become non-compact. When applied to stationary rotating black holes this limit coincides with the “ultraspinning limit” and yields t... Read More about Are “Superentropic” black holes superentropic?.

Higgs vacuum decay in a braneworld (2019)
Journal Article
Cuspinera, L., Gregory, R., Marshall, K. M., & Moss, I. G. (2020). Higgs vacuum decay in a braneworld. International Journal of Modern Physics D, 29(1), Article 2050005. https://doi.org/10.1142/s0218271820500054

We examine the effect of large extra dimensions on vacuum decay in the Randall– Sundrum (RS) braneworld paradigm. We assume the scalar field is confined to the brane, and compute the probability for forming an “anti-de Sitter” (AdS) bubble inside a c... Read More about Higgs vacuum decay in a braneworld.

Conical holographic heat engines (2019)
Journal Article
Ahmed, W., Chen, H. Z., Gesteau, E., Gregory, R., & Scoins, A. (2019). Conical holographic heat engines. Classical and Quantum Gravity, 36(21), https://doi.org/10.1088/1361-6382/ab470b

We demonstrate that adding a conical deficit to a black hole holographic heat engine increases its efficiency; in contrast, allowing a black hole to accelerate decreases efficiency if the same average conical deficit is maintained. Adding other charg... Read More about Conical holographic heat engines.

Rotating black holes in higher order gravity (2019)
Journal Article
Charmousis, C., Crisostomi, M., Gregory, R., & Stergioulas, N. (2019). Rotating black holes in higher order gravity. Physical Review D, 100(8), Article 084020. https://doi.org/10.1103/physrevd.100.084020

We develop a new technique for finding black hole solutions in modified gravity that have “stealth” hair, i.e., hair of which the only gravitational effect is to tune the cosmological constant. We consider scalar-tensor theories in which gravitationa... Read More about Rotating black holes in higher order gravity.

Simulating seeded vacuum decay in a cold atom system (2019)
Journal Article
Billam, T. P., Gregory, R., Michel, F., & Moss, I. G. (2019). Simulating seeded vacuum decay in a cold atom system. Physical Review D, 100(6), Article 065016. https://doi.org/10.1103/physrevd.100.065016

We propose to test the concept of seeded vacuum decay in cosmology using a Bose-Einstein condensate system. The role of the nucleation seed is played by a vortex within the condensate. We present two complementary theoretical analyses that demonstrat... Read More about Simulating seeded vacuum decay in a cold atom system.