Publications & Preprints

Numerical convergence of model Cauchy-characteristic extraction and matching
Gravitational waves provide a powerful enhancement to our understanding of fundamental physics. To make the most of their detection we …
Thanasis Giannakopoulos, Nigel T. Bishop, David Hilditch, Denis Pollney, Miguel Zilhão
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Numerical convergence of model Cauchy-characteristic extraction and matching
Characteristic formulations of general relativity and applications
General relativity can describe various gravitational systems of astrophysical relevance, like black holes and neutron stars, or even …
Thanasis Giannakopoulos
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Characteristic formulations of general relativity and applications
Holographic bubbles with Jecco: expanding, collapsing and critical
Cosmological phase transitions can proceed via the nucleation of bubbles that subsequently expand and collide. The resulting …
Yago Bea, Jorge Casalderrey-Solana, Thanasis Giannakopoulos, Aron Jansen, David Mateos, Mikel Sanchez-Garitaonandia, Miguel Zilhão
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Holographic bubbles with Jecco: expanding, collapsing and critical
Domain collisions
We use holography to study collisions of phase domains formed in a four-dimensional, strongly-coupled gauge theory with a first-order, …
Yago Bea, Jorge Casalderrey-Solana, Thanasis Giannakopoulos, David Mateos, Mikel Sanchez-Garitaonandia, Miguel Zilhão
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Domain collisions
Gauge structure of the Einstein field equations in Bondi-like coordinates
The characteristic initial (boundary) value problem has numerous applications in general relativity (GR) involving numerical studies …
Thanasis Giannakopoulos, Nigel T. Bishop, David Hilditch, Denis Pollney, Miguel Zilhão
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Gauge structure of the Einstein field equations in Bondi-like coordinates
Spinodal Gravitational Waves
We uncover a new gravitational-wave production mechanism in cosmological, first-order, thermal phase transitions. These are usually …
Yago Bea, Jorge Casalderrey-Solana, Thanasis Giannakopoulos, Aron Jansen, Sven Krippendorf, David Mateos, Mikel Sanchez-Garitaonandia, Miguel Zilhão
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Bubble wall velocity from holography
Cosmological phase transitions proceed via the nucleation of bubbles that subsequently expand and collide. The resulting gravitational …
Yago Bea, Jorge Casalderrey-Solana, Thanasis Giannakopoulos, David Mateos, Mikel Sanchez-Garitaonandia, Miguel Zilhão
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Crossing a large-N phase transition at finite volume
The existence of phase-separated states is an essential feature of infinite-volume systems with a thermal, first-order phase …
Yago Bea, Oscar J.C. Dias, Thanasis Giannakopoulos, David Mateos, Mikel Sanchez-Garitaonandia, Jorge E. Santos, Miguel Zilhão
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Hyperbolicity of General Relativity in Bondi-like gauges
Bondi-like (single-null) characteristic formulations of general relativity are used for numerical work in both asymptotically flat and …
Thanasis Giannakopoulos, David Hilditch, Miguel Zilhão
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Hyperbolicity of General Relativity in Bondi-like gauges