A5024030287- Pulsars and Gravitational Waves Research
- Astrophysical Phenomena and Observations
- Cosmology and Gravitation Theories
- Black Holes and Theoretical Physics
- Gamma-ray bursts and supernovae
- Dark Matter and Cosmic Phenomena
- Geophysics and Sensor Technology
- High-pressure geophysics and materials
- Galaxies: Formation, Evolution, Phenomena
- Particle physics theoretical and experimental studies
- Astrophysics and Cosmic Phenomena
- Cold Atom Physics and Bose-Einstein Condensates
University of Aveiro
2022-2023
University of Lisbon
2018-2022
Instituto de Engenharia de Sistemas e Computadores Investigação e Desenvolvimento
2020-2022
Museu de Astronomia e Ciências Afins
2022
Institute of Astrophysics and Space Sciences
2018-2021
The grand challenges of contemporary fundamental physics---dark matter, dark energy, vacuum inflation and early universe cosmology, singularities the hierarchy problem---all involve gravity as a key component. And all gravitational phenomena, black holes stand out in their elegant simplicity, while harbouring some most remarkable predictions General Relativity: event horizons, ergoregions. hitherto invisible landscape Universe is being unveiled before our eyes: historical direct detection...
Scalar fields can give rise to confined structures, such as boson stars or Q-balls. These objects are interesting hypothetical new "dark matter stars," but also good descriptions of dark haloes when the ultralight. Here, we study dynamical response bosonic structures excited by external (stars, planets black holes) in their vicinities. Such perturbers either be plunging through configuration simply act periodic sources. Our setup efficiently describe interaction between a massive hole and...
In general relativity, Maxwell's equations are embedded in curved spacetime through the minimal prescription, but this could change if strong-gravity modifications present. We show that with a nonminimal coupling between gravity and massless vector field, nonperturbative effects can arise compact stars. find solutions describing stars nontrivial field configurations, some of which associated to an instability, while others not. The be interpreted either as electromagnetic or hidden weakly...
Bosonic fields can give rise to self-gravitating structures. These are interesting hypothetical new "dark matter stars" and good descriptions of dark haloes if the very light. We study dynamical response Newtonian boson stars (NBS) when excited by external (stars, planets or black holes) in their vicinities. Our setup describe interaction between a massive hole surrounding environment, shortly after body has undergone "kick", due collapse baryonic at galactic center, depletion as reaction an...
In the presence of certain non-minimal couplings between a scalar field and Gauss-Bonnet curvature invariant, Kerr black holes can scalarize, as long they are spinning fast enough. This provides distinctive violation hypothesis, occurring only for some high spin range. this paper we assess if strong magnetic fields, that may exist in vicinity astrophysical holes, could facilitate effect, by bringing down threshold scalarization. inquiry is motivated fact self-gravitating themselves, also...
In linear perturbation theory, a static perturber in the vicinity of Schwarzschild black hole (BH) enhances [suppresses] Gauss-Bonnet (GB) curvature invariant, RGB, high [low] tide regions. By analysing exact solutions vacuum Einstein field equations describing one or two BHs immersed multipolar gravitational field, which is locally free pathologies, including conical singularities, we study corresponding non-linear tides on fiducial BH, full General Relativity (GR). We show that tidal due...
The direct detection of gravitational waves crowns decades efforts in the modelling sources and increasing detectors' sensitivity. With future third-generation Earth-based detectors or space-based observatories, gravitational-wave astronomy will be at its full bloom. Previously brushed-aside questions on environmental other systematic effects generation propagation are now begging for a treatment. Here, we study how electromagnetic radiation is scattered by binary system. Scattering...
The ability to model the evolution of compact binaries from inspiral coalescence is central gravitational wave astronomy. Current waveform catalogues are built vacuum binary black hole models, by evolving Einstein equations numerically and complementing them with knowledge slow-motion expansions. Much less known about process in presence matter, or theories other than General Relativity. Here, we explore Close Limit Approximation as a powerful tool understand general setups. In particular,...
The close limit approximation of a binary black hole is powerful method to study gravitational-wave emission from highly nonlinear geometries. In this work, we use it as tool model spacetimes in theories gravity with new fundamental scalar degree freedom. As an example, consider Einstein-scalar-Gauss-Bonnet gravity, which admits solution the Schwarzschild geometry well holes hair. Accordingly, find perturbations growing unbounded around systems. This ``dynamical scalarization'' process...
The most accurate model to describe the gravitational interaction is well-known theory of General Relativity. Several observational evidences corroborate legitimacy compared older Newtonian gravity. Relativity furthermore predicts existence waves, i.e. spacetime ripples produced by accelerated masses. Thanks a connected network interferometers called LIGO/Virgo, waves from coalescence massive and compact astrophysical bodies have been measured directly. These recent observations paved way...
In linear perturbation theory, a static perturber in the vicinity of Schwarzschild black hole (BH) enhances [suppresses] Gauss-Bonnet (GB) curvature invariant, $\mathcal{R}_{\rm GB}$, high [low] tide regions. By analysing exact solutions vacuum Einstein field equations describing one or two BHs immersed multipolar gravitational field, which is locally free pathologies, including conical singularities, we study corresponding non-linear tides on fiducial BH, full General Relativity (GR). We...