601 talks across 60 sessions. Search by title, author or full text.
601 results
TianQin is a Chinese space-borne gravitational wave detector proposed in 2014, and aims to detect gravitational waves in the frequency range of 1mHz ~ 1 Hz, with three earth orbiting satellites with an orbital radius of about 105 km forming an equilateral tria…
Spherical collapse in general relativity has been studied with different methods, especially by using a priori given equations of state that describe the collapsing matter as a perfect fluid. We propose an alternative perspective, in which the initial density…
The relationship between philosophy and science has historically been characterized by a deep interconnection between the empirical construction of reality and theoretical frameworks. Physics, as an epistemologically autonomous discipline with its own experime…
An alternative formulation of classical electromagnetism relying on torsion in metrically flat spacetime in four dimensions is presented. Unification with gravitation is then obtained as a direct consequence of the extension to the more general case of metrica…
In this talk I am presenting Bayesian Model Averaging, a well established statistical technique that offers a principled approach to model uncertainty marginalization in a Bayesian context.Specifically, this talk goes through the two recent papers I published…
10691 Stockholm, Sweden Gamma-ray bursts (GRBs) are one of the most energetic explosions known in the Universe. Even though many GRBs have been observed since their discovery more than 50 years ago, and despite the success of the “fireball”model, there are sti…
Innovation Academy of Precision Measuremnt Sciencs and Technology of Chinese Academy of Sciences A large number of galactic binary systems emit gravitational waves (GW) continuously with frequencies below ∼10 mHz. The LISA mission could identify tens of thousa…
As the last student of Prof. Malheiro I would like to talk about him and present my work which he was involved in his last year of his life: The study of Active Galactic Nuclei (AGN) has garnered significant attention due to their structures and dynamic behavi…
After the first groundbreaking observation of gravitational waves emitted by the collision of two black holes on 14 September 2015, the LIGO-Virgo-KAGRA network has completed three successful observing runs yielding nearly a hundred events. All detections were…
We analyze the extraction of the rotational energy of a Kerr black hole (BH) endowed with a test charge and surrounded by an external test magnetic field and ionized low-density matter. For a magnetic field parallel to the BH spin, the electric field accelerat…
In 2006 we proposed the conjecture that rotating wormholes might be stable, while static ones might not be. In this talk we present an exact solution of the Einstein-Phantom Field equations similar to the Kerr solution. It is singular in a ring around the thro…
I will review the properties of kilonova host galaxies, focusing in particular on kilonovae detected from their associated gamma-ray burst component. A special consideration will be devoted to the physical properties of KNe, such as the offset from their hosts…
New wide-field astronomical surveys are opening a new window on the Universe, by collecting data for extraordinarily vaste samples of galaxies. Strong gravitational lenses are rare astronomical events, whose actual number will increase of more than 100 times t…
Strong gravitational lenses are massive cosmic objects, like galaxies or galaxy clusters, which can map an extended background source, like a galaxy, into several highly distorted and magnified images. Analysing the properties of those images yields important…
I will briefly discuss how the first images of the supermassive black holes M87and Sgr A were obtained by the EHT collaboration. In particular, I will describe the theoretical aspects that have allowed us to model the dynamics of the plasma accreting onto the…
The fourth observing run (O4) of LIGO-Virgo-KAGRA is now ongoing, relying on the most sensitive network of gravitational-wave interferometers to date. In this talk, I will highlight in a multimessenger context some of the most recent astrophysical findings and…
Abstract: Stueckelberg solved the problem of gauge invariance in massive QED by a new mechanism which is precursor for Abelian Higgs. It has several implications in Cosmology and we will discuss few of them. Strong electromagnetic and gravitational field physi…
The discovery of gravitational waves and their synergistic signatures has opened immense opportunities for astrophysics. Significant advancements in gravitational-wave detector technology, both on Earth and in space, along with progress in electromagnetic and…
This presentation explores some applications of transfer learning in astronomical image analysis, focusing on the usage of a pretrained network (EfficientNet) as a feature extractor. We discuss methods for identifying active galactic nuclei, extracting physica…
A well-known effect confirmed by astrophysical observations is the light deflection in the gravitational field. In the recent years, the Hamiltonian formalism has been frequently applied in analytical studies to discuss how a medium that surrounds the gravitat…
UCAS The gravitational quantum field theory is a gauge formulation of the gravity dynamics based on the inhomogeneous spin gauge symmetry, which leads to the generalized Einstein equation. In order to test this theory, we linearize the dynamic equations of gra…
This work aims to investigate the impact of spatial curvature in modified gravity models, specifically within the Horndeski framework. Typically overlooked in the literature due to the spatial flatness assumed in the ΛCDM model, this study aims to fill this ga…
Multimessenger signals from binary neutron star (BNS) mergers are promising tools to infer the largely unknown properties of nuclear matter at densities that are presently inaccessible to laboratory experiments. The gravitational waves (GWs) emitted by BNS mer…
Supernova (SN) 2023ixf in M101 is the closest SN explosion observed in the last decade. Therefore, it is a suitable test bed to study the role of jets in powering the SN ejecta. With this aim, we explored the idea that high-energy neutrinos could be produced d…
The luminosity distance-redshift (DL-z) relation of Type Ia supernovae (SNe Ia) yields evidence for a nonzero cosmological constant, i.e. ‘dark energy’. SNe Ia analyses typically involve fitting the DL and z to the functional form derived theoretically from th…