120 citations · 1.2k across the 37 of their papers we have counts for
36 papers · 1 filter
Wormhole geometries in gravity satisfying the energy conditions
Nailya Ganiyeva, João Luís Rosa, Francisco S. N. Lobo
We explore the properties of traversable wormhole spacetimes within the framework of energy-momentum squared gravity, also known as gravity, where represents the Ric…
Energy-Momentum Squared Gravity: A Brief Overview
Ricardo A. C. Cipriano, Nailya Ganiyeva, Tiberiu Harko +3
In this work, we present a review of Energy-Momentum Squared Gravity (EMSG) -- more specifically, gravity, where represents the Ricci scalar and de…
Spherically symmetric vacuum solutions in 1-Parameter New General Relativity and their phenomenology
Helen Asuküla, Sebastian Bahamonde, Manuel Hohmann +3
In this work, we study spherically symmetric vacuum solutions in 1-parameter New General Relativity (NGR), a specific theory in teleparallel gravity which is constructed from the t…
Traversable wormholes with double layer thin shells in quadratic gravity
Joao Luís Rosa, Rui André, José P. S. Lemos
In quadratic gravity, the junction conditions are six and permit the appearance of double layer thin shells. Double layers arise typically in theories with dipoles, i.e., two oppos…
Dynamical reconstruction of the CDM model in scalar-tensor gravity
Tiago B. Gonçalves, João Luís Rosa, Francisco S. N. Lobo
In this work, we use the dynamical system approach to explore the cosmological background evolution of the scalar-tensor representation of gravity, where is the Ricci…
Imaging compact boson stars with hot-spots and thin accretion disks
João Luís Rosa, Caio F. B. Macedo, Diego Rubiera-Garcia
In this work we consider the observational properties of compact boson stars with self-interactions orbited by isotropically emitting (hot-spot) sources and optically thin accretio…
Scalar-tensor representation to brane with Gauss-Bonnet gravity
A. S. Lobão, João Luís Rosa, D. Bazeia
In this paper, we generalize the analysis of the brane via the inclusion of a term proportional to the Gauss-Bonnet invariant. We consider an action of the form $F(R,G,T)=…
Junction conditions for LRS spacetimes in the covariant formalism
João Luís Rosa, Sante Carloni
We use the distribution formalism to derive the complete set of junction conditions for general Local Rotationally Symmetric (LRS) spacetimes in the covariant formalism. We…
Observational properties of relativistic fluid spheres with thin accretion disks
João Luís Rosa
In this work we analyze the observational properties of incompressible relativistic fluid spheres with and without thin-shells, when surrounded by thin accretion disks. We consider…
Shadows and photon rings of regular black holes and geonic horizonless compact objects
Gonzalo J. Olmo, João Luís Rosa, Diego Rubiera-Garcia +1
The optical appearance of a body compact enough to feature an unstable bound orbit, when surrounded by an accretion disk, is expected to be dominated by a luminous ring of radiatio…
Non-exotic traversable wormhole solutions in linear gravity
João Luís Rosa, Paul Martin Kull
In this work we analyze traversable wormhole solutions in the linear form of gravity satisfying the Null, Weak, Strong, and Dominant Energy Conditions (NEC…
Multi-kink braneworld configurations in the scalar-tensor representation of gravity
D. Bazeia, A. S. Lobão, João Luís Rosa
In this work we investigate the brane in the scalar-tensor representation, where the solutions of the equations of motions for the source field engender topological defect…
Observational signatures of hot spots orbiting horizonless objects
João Luís Rosa, Paulo Garcia, Frédéric H. Vincent +1
Pushed by a number of advances, electromagnetic observatories have now reached the horizon scale of supermassive black holes. The existence and properties of horizons in our univer…
Shadows of boson and Proca stars with thin accretion disks
João Luís Rosa, Diego Rubiera-Garcia
In this work, we obtain the shadow images of spherically symmetric scalar boson and Proca stars using analytical fittings of numerical solutions, when illuminated by a geometricall…
Junction conditions of Palatini gravity
João Luís Rosa, Diego Rubiera-Garcia
We work out the junction conditions for the Palatini extension of General Relativity, where is an arbitrary function of the curvature scalar of…
Cosmological sudden singularities in gravity
Tiago B. Gonçalves, João Luís Rosa, Francisco S. N. Lobo
In this work, we study the possibility of finite-time future cosmological singularities appearing in gravity, where is the Ricci scalar and is the trace of the str…
Impact of compactlike and asymmetric configurations of thick branes on the scalar-tensor representation of gravity
João Luís Rosa, A. S. Lobão, D. Bazeia
In this work we study braneworld models in generalized gravity theories where the action depends on a function of the Ricci scalar and the trace of the stre…
local strings in generalized hybrid metric-Palatini gravity
Hilberto M. R. da Silva, Tiberiu Harko, Francisco S. N. Lobo +1
In this work we will explore local cosmic string solutions in the context of the generalized hybrid metric-Palatini theory of gravity in its scalar-tensor representation. Us…
Cosmology in scalar-tensor gravity
Tiago B. Gonçalves, João Luís Rosa, Francisco S. N. Lobo
In this work, we use reconstruction methods to obtain cosmological solutions in the recently developed scalar-tensor representation of gravity. Assuming that matter is des…
Junction conditions for generalized hybrid metric-Palatini gravity with applications
João Luís Rosa, José P. S. Lemos
The generalized hybrid metric-Palatini gravity is a theory of gravitation that has an action composed of a Lagrangian , where is a function of the metric Ricci sca…
Effects of Cuscuton dynamics on braneworld configurations in the scalar-tensor representation of gravity
João Luís Rosa, D. Bazeia, A. S. Lobão
In this work we study braneworld configurations in the scalar-tensor representation of the gravity theory in the presence of a Cuscuton term in the source field…
Double gravitational layer traversable wormholes in hybrid metric-Palatini gravity
João Luís Rosa
In this work, we explore the existence of traversable wormhole solutions supported by double gravitational layer thin-shells and satisfying the Null Energy Condition (NEC) througho…
Thick branes in the scalar-tensor representation of gravity
João Luís Rosa, Matheus A. Marques, Dionisio Bazeia +1
Braneworld scenarios consider our observable universe as a brane embedded in a five-dimensional bulk. In this work, we consider thick braneworld systems in the recently proposed dy…
Weak-field regime of the generalized hybrid metric-Palatini gravity
João Luís Rosa, Francisco S. N. Lobo, Gonzalo J. Olmo
In this work we explore the dynamics of the generalized hybrid metric-Palatini theory of gravity in the weak-field, slow-motion regime. We start by introducing the equivalent scala…