53 citations · 210 across the 15 of their papers we have counts for
10 papers · 1 filter
Theoretical filters for shift-symmetric Horndeski gravities
Athanasios Bakopoulos, Christos Charmousis, Nikos Chatzifotis +1
We investigate the structure of nontrivial maximally symmetric vacua and compact-object solutions in shift-symmetric scalar-tensor theories. Focusing on Horndeski gravity, we deriv…
Smarr formula for black holes with primary and secondary scalar hair
Yun Soo Myung, Theodoros Nakas
In this work, we revisit the thermodynamics of black holes endowed with primary and secondary scalar hair in the shift and symmetric subclass of beyond Horndeski gravit…
On the uplift of 4D wormholes in Braneworld models and their 5D structure
Thomas D. Pappas, Theodoros Nakas
Recent developments for the consistent embedding of general 4D static and spherically-symmetric spacetimes in arbitrary single-brane braneworld models in the form of the General Em…
Compact objects with primary hair in shift and parity symmetric beyond Horndeski gravities
Athanasios Bakopoulos, Nikos Chatzifotis, Theodoros Nakas
In this work, we delve into the model of the shift symmetric and parity-preserving Beyond Horndeski theory in all its generality. We present an explicit algorithm to extract static…
Black holes with primary scalar hair
Athanasios Bakopoulos, Christos Charmousis, Panagiota Kanti +2
We present explicit black holes endowed with primary scalar hair within the shift-symmetric subclass of Beyond Horndeski theories. These solutions depend, in addition to the conven…
Bridging Dimensions: General Embedding Algorithm and Field-Theory Reconstruction in 5D Braneworld Models
Theodoros Nakas, Thomas D. Pappas, Zdeněk Stuchlík
We develop a general algorithm that enables the consistent embedding of any four-dimensional static and spherically symmetric geometry into any five-dimensional single-brane branew…
Novel exact ultra-compact and ultra-sparse hairy black holes emanating from regular and phantom scalar fields
Athanasios Bakopoulos, Theodoros Nakas
In the framework of a simple gravitational theory that contains a scalar field minimally coupled to gravity, we investigate the emergence of analytic black-hole solutions with non-…
Analytic and asymptotically flat hairy (ultra-compact) black-hole solutions and their axial perturbations
Athanasios Bakopoulos, Theodoros Nakas
In this work, we consider a very simple gravitational theory that contains a scalar field with its kinetic and potential terms minimally coupled to gravity, while the scalar field…
Anti-Gravitating Brane-World Solutions for a de Sitter Brane in Scalar-Tensor Gravity
Panagiota Kanti, Theodoros Nakas, Nikolaos Pappas
In the context of a five-dimensional theory with a scalar field non-minimally-coupled to gravity, we look for solutions that describe novel black-string or maximally-symmetric solu…
Searching for Localized Black-Hole solutions in Brane-World models
Theodoros Nakas
In the context of this thesis, the question that is going to occupy us, is the existence of a 5-dimensional braneworld black hole solution that is localized close to the 3-brane an…