Relativity

by Josep Blai Covas Vidal

Title: Spherical Einstein Field Equations on Hyperboloidal Slices: A Generalized Harmonic Gauge Formalism Author: Shalabh Gautam Hour: 12.00 Place: Antoni Maria Alcover i Sureda, aula [...]

We explore the Algebraic-Hyperbolic Formulation (AHF) or 2+1 decomposition of the constraint equations in cosmological scenarios. We propose a pseudo-spectral method based on the Fourier [...]

Unknown neutron stars in binary systems might be one of the best sources of continuous gravitational waves (yet to be detected), due to their millisecond [...]

Over the past few years, with the help of LIGO-Virgo-KAGRA detector network, the catalog of Gravitational Waves (GW) merger events have grown to about 90 [...]

Data-driven methods like surrogate modeling can capture the full physics of binary black hole simulations, including complex effects like spin precession and recoil kicks. As [...]

The following 20 of June 2023 at 15h  Federrico Carrasco from the Universidad de Cordoba will give a seminar entittle "Are multipolar magnetic field necessary [...]

The following 22 of June 2023 at 12h  Jose Pons professor in the Universidad de Alicante will give a seminar entittle "Modelling Force-Free Neutron Star [...]

Abstract: The central black hole of active galaxies accretes large amounts of matter and powers jets of relativistic particles that can propagate beyond the host [...]

When performing parameter estimation for gravitational-wave (GW) data, Bayesian techniques provide a powerful framework to describe said parameters. These techniques are consistent with both our prior [...]

Gravitational wave radiation is only unambiguously defined at future null infinity - the location in spacetime where light rays arrive and where global properties of [...]

Accurate modeling of neutrino transport plays a crucial role in understanding astrophysical phenomena such as core-collapse supernovae and neutron star mergers. This talk will review [...]

Although the gravitational wave signal emitted by the merging of compact objects, such as black holes or neutron stars, has almost become “normal”, we are [...]

Since 2015, the LIGO-Virgo-KAGRA collaboration has been detecting and analyzing gravitational-wave signals, with about 90 observations of compact binary coalescence signals after the third-observing runs. [...]

With increasing sensitivities of the current ground-based gravitational wave (GW) detectors, the prospects of detecting a gravitationally lensed GW signal are going to improve in [...]

The analytical modelling of gravitational waves in general relativity has been one of the key element to allow the numerous detections by the LIGO-Virgo-KAGRA collaboration. [...]

The detection of 90+ gravitational wave signals produced by coalescing black holes or neutron stars have opened up a rich discovery space for astrophysics, gravitation, [...]

In recent years there has been an increased interest in modelling the nonlinear dynamics in theories beyond general relativity. Recent work by different groups has [...]

Galactic nuclei are extreme environments where stars are densely packed around a supermassive black hole (SMBH). Occasionally, dynamical interactions in the galactic center lead the [...]

The inference of quasinormal modes frequencies from the ringdown part of gravitational-wave signals produced by the coalescence of black hole binaries can be used to [...]

The growing number of gravitational wave detections in recent years has established Gravitational waves astronomy as a strong contributor to multi messenger astronomy. In this [...]

The sensitivity of gravitational waves detectors keeps improving and we should expect to find gravitationally lensed gravitational waves soon. Since the number of detections is [...]

Rapidly spinning, non-axisymmetric neutron stars (NSs) are expected to emit continuous gravitational waves (CWs). Detecting such signals would significantly improve our understanding of the galactic [...]

The increase in sensitivity and detector upgrades planned in the coming years will challenge existing waveform models and demand considerable improvements in accuracy, parameter space [...]

The current phenomenological waveform models for binary black hole mergers do not include the (l=2, m=0) spherical harmonic, which is the only mode with l=2 [...]

Precessing binaries exhibit complex dynamics that significantly modulate the emitted gravitational waveform. Describing such systems is challenging due to the lack of a canonical choice [...]

Solutions to the Einstein Equations that are close to the threshold of black hole formation exhibit features that resemble critical phenomena in statistical mechanics. We [...]

Gravitational wave memory is characterized by a signal component that persists after a transient signal has decayed. Treating such signals in the frequency domain is [...]

State-of-the-art gravitational waveform models need input from many frameworks tackling the relativistic two-body problem. Among them are the gravitational self-force approach, which was designed to [...]

There are a wide variety of phenomena in solar prominences, such as waves, instabilities or mass flows. Observations have shown the ubiquitous presence of MHD [...]