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pro vyhledávání: '"Giannakopoulos, Thanasis"'
Autor:
Giannakopoulos, Thanasis
General relativity can describe various gravitational systems of astrophysical relevance, like black holes and neutron stars, or even strongly coupled systems through the holographic duality. The characteristic initial (boundary) value problem has nu
Externí odkaz:
http://arxiv.org/abs/2308.16001
Gravitational waves provide a powerful enhancement to our understanding of fundamental physics. To make the most of their detection we need to accurately model the entire process of their emission and propagation toward interferometers. Cauchy-charac
Externí odkaz:
http://arxiv.org/abs/2306.13010
Autor:
Bea, Yago, Casalderrey-Solana, Jorge, Giannakopoulos, Thanasis, Jansen, Aron, Mateos, David, Sanchez-Garitaonandia, Mikel, Zilhão, Miguel
Publikováno v:
JHEP09(2022)008
Cosmological phase transitions can proceed via the nucleation of bubbles that subsequently expand and collide. The resulting gravitational wave spectrum depends crucially on the properties of these bubbles. We extend our previous holographic work on
Externí odkaz:
http://arxiv.org/abs/2202.10503
Autor:
Bea, Yago, Casalderrey-Solana, Jorge, Giannakopoulos, Thanasis, Jansen, Aron, Krippendorf, Sven, Mateos, David, Sanchez-Garitaonandia, Mikel, Zilhão, Miguel
We uncover a new gravitational-wave production mechanism in cosmological, first-order, thermal phase transitions. These are usually assumed to proceed via the nucleation of bubbles of the stable phase inside the metastable phase. However, if the nucl
Externí odkaz:
http://arxiv.org/abs/2112.15478
Publikováno v:
Phys. Rev. D 105, 084055 (2022)
The characteristic initial (boundary) value problem has numerous applications in general relativity (GR) involving numerical studies, and is often formulated using Bondi-like coordinates. Recently it was shown that several prototype formulations of t
Externí odkaz:
http://arxiv.org/abs/2111.14794
Autor:
Bea, Yago, Casalderrey-Solana, Jorge, Giannakopoulos, Thanasis, Mateos, David, Sanchez-Garitaonandia, Mikel, Zilhão, Miguel
We use holography to study collisions of phase domains formed in a four-dimensional, strongly-coupled gauge theory with a first-order, thermal phase transition. We find three qualitatively different dynamical regimes depending on the collision veloci
Externí odkaz:
http://arxiv.org/abs/2111.03355
Autor:
Bea, Yago, Casalderrey-Solana, Jorge, Giannakopoulos, Thanasis, Mateos, David, Sanchez-Garitaonandia, Mikel, Zilhão, Miguel
Publikováno v:
Phys. Rev. D 104, L121903 (2021)
Cosmological phase transitions proceed via the nucleation of bubbles that subsequently expand and collide. The resulting gravitational wave spectrum depends crucially on the bubble wall velocity. Microscopic calculations of this velocity are challeng
Externí odkaz:
http://arxiv.org/abs/2104.05708
Autor:
Bea, Yago, Dias, Oscar J. C., Giannakopoulos, Thanasis, Mateos, David, Sanchez-Garitaonandia, Mikel, Santos, Jorge E., Zilhao, Miguel
The existence of phase-separated states is an essential feature of infinite-volume systems with a thermal, first-order phase transition. At energies between those at which the phase transition takes place, equilibrium homogeneous states are either me
Externí odkaz:
http://arxiv.org/abs/2007.06467
Publikováno v:
Phys. Rev. D 102, 064035 (2020)
Bondi-like (single-null) characteristic formulations of general relativity are used for numerical work in both asymptotically flat and anti-de Sitter spacetimes. Well-posedness of the resulting systems of partial differential equations, however, rema
Externí odkaz:
http://arxiv.org/abs/2007.06419
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