97 citations · 418 across the 15 of their papers we have counts for
15 papers
Axial perturbations of hairy black holes in generalised scalar-tensor theories
Georgios Antoniou, Caio F. B. Macedo, Andrea Maselli +1
Gravitational wave observations can test the validity of General Relativity (GR) in the strong field regime. Certain classes of scalar-tensor theories indeed predict that compact o…
New perspectives on scalar fields in strong gravity
Georgios Antoniou
Recent developments in the field of gravitational physics, including the emergence of gravitational wave astronomy, black hole images, and more accurate telescopes, have allowed us…
Black hole minimum size and scalar charge in shift-symmetric theories
Farid Thaalba, Georgios Antoniou, Thomas P. Sotiriou
It is known that, for shift-symmetric scalars, only a linear coupling with the Gauss-Bonnet invariant can introduce black hole hair. Such hairy black holes have a minimum mass, det…
Constraining modified gravity theories with scalar fields using black-hole images
Georgios Antoniou, Alexandros Papageorgiou, Panagiota Kanti
We study a number of well-motivated theories of modified gravity with the common overarching theme that they predict the existence of compact objects such as black holes and wormho…
Stable spontaneously-scalarized black holes in generalized scalar-tensor theories
Georgios Antoniou, Caio F. B. Macedo, Ryan McManus +1
It has been shown that the synergy of a scalar field coupling with both the Ricci scalar and the Gauss-Bonnet invariant significantly affects the properties of scalarized black hol…
Neutron star scalarization with Gauss-Bonnet and Ricci scalar couplings
Giulia Ventagli, Georgios Antoniou, Antoine Lehébel +1
Spontaneous scalarization of neutron stars has been extensively studied in the Damour and Esposito-Farèse model, in which a scalar field couples to the Ricci scalar or, equivalentl…
Black hole scalarization with Gauss-Bonnet and Ricci scalar couplings
Georgios Antoniou, Antoine Lehébel, Giulia Ventagli +1
Spontaneous scalarization is a gravitational phenomenon in which deviations from general relativity arise once a certain threshold in curvature is exceeded, while being entirely ab…
A Multimodal Framework for the Detection of Hateful Memes
Phillip Lippe, Nithin Holla, Shantanu Chandra +4
An increasingly common expression of online hate speech is multimodal in nature and comes in the form of memes. Designing systems to automatically detect hateful content is of para…
The Saito determinant for Coxeter discriminant strata
Georgios Antoniou, Misha Feigin, Ian A. B. Strachan
Let be a finite Coxeter group and its reflection representation. The orbit space has the remarkable Saito flat metric defined as a Lie derivative of th…
Compact object scalarization with general relativity as a cosmic attractor
Georgios Antoniou, Lorenzo Bordin, Thomas P. Sotiriou
We demonstrate that there are theories that exhibit spontaneous scalarization in the strong gravity regime while having General Relativity with a constant scalar as a cosmological…
Solutions of Type of WDVV Equations
Maali Alkadhem, Georgios Antoniou, Misha Feigin
We give a family of solutions of Witten-Dijkgraaf-Verlinde-Verlinde equations in -dimensional space. It is defined in terms of root system and independent multipl…
Novel Einstein-Scalar-Gauss-Bonnet Wormholes without Exotic Matter
Georgios Antoniou, Athanasios Bakopoulos, Panagiota Kanti +2
Novel wormholes are obtained in Einstein-scalar-Gauss-Bonnet theory for several coupling functions. The wormholes may feature a single-throat or a double-throat geometry and do not…
Novel Black-Hole Solutions in Einstein-Scalar-Gauss-Bonnet Theories with a Cosmological Constant
Athanasios Bakopoulos, Georgios Antoniou, Panagiota Kanti
We consider the Einstein-scalar-Gauss-Bonnet theory in the presence of a cosmological constant , either positive or negative, and look for novel, regular black-hole solutions wi…
Supersymmetric V-systems
Georgios Antoniou, Misha Feigin
We construct superconformal quantum mechanical system for any configuration of vectors forming a V-system. In the case of a Coxeter root system th…
Law of refraction for generalised confocal lenslet arrays
Stephen Oxburgh, Chris D. White, Georgios Antoniou +1
We derive the law of generalised refraction for generalised confocal lenslet arrays, which are arrays of misaligned telescopes. We have implemented this law of refraction in TIM, a…