The forthcoming space-based gravitational wave detectors such as LISA, Tianqin and Taiji will unlock the low-frequency gravitational-wave sky, offering an unprecedented probe into the fundamental dynamics of gravity. A prime target for such detectors is Extreme Mass Ratio Inspirals (EMRIs)—the adiabatic inspiral of a stellar-mass compact object into a supermassive black hole. While...
Physics-informed neural networks (PINNs) have gained considerable importance in recent years in the domain of Astronomy \& Astrophysics, particularly as a potential tool to solve differential equations within the given boundary conditions, not only for making accurate predictions but also for providing an efficient approach for large computations. In this work, we have focused on solving the...
The dense and dynamic environments that is active galactic nuclei (AGN) accretion disks may be a birthplace for binary black holes (BBHs). It is thus a new possible formation channel for BBHs, which is getting more interest recently. This presentation exhibits recent results aimed at describing the gravitational waves (GWs) lensing of a binary merger event occuring behind an AGN (an AGN-BBH...
The origin of globular clusters remains one of the most important open questions in astrophysics, with essential implications for our understanding of galaxy formation and the early Universe.
Globular clusters are unique sites of hierarchical black hole mergers, where the remnant of a previous merger undergoes a subsequent coalescence, a process only expected in the dense dynamical...
Dark matter could compose ~80% of all matter in the universe, and yet it is completely invisible to us. Despite decades of experiments designed to detect dark matter, and numerous models for potential dark matter particles, no concrete evidence has been put forward to support the existence of beyond standard-model physics. Because of this, it is worth asking whether approaching the detection...
Eccentric compact binary coalescences (CBCs) are expected to be observed in current and future gravitational-wave (GW) detector networks. Such detections are especially valuable as they can provide insights on the environments that nurture CBCs. However, it has been recently pointed out that a number of other physical and beyond-GR effects could imitate, or be mimicked by, eccentric CBCs. The...
The Laser Interferometer Space Antenna (LISA) will open a new observational window into the millihertz gravitational wave sky, enabling observations of sources previously inaccessible to ground-based detectors. One of the most anticipated is the detection of Extreme Mass Ratio Inspiral (EMRI) systems, in which a stellar-mass compact object completes at least tens of thousands of orbits around...
The Laser Interferometer Space Antenna (LISA) will be the first gravitational wave detector able
to observe sources that emit in the millihertz regime such as Galactic Binaries (GBs), Massive Black Hole Binaries (MBHBs) or Extreme Mass Ratio Inspirals (EMRIs). Consequently, the data stream sent by LISA will be a superposition of an unknown number of various gravitational wave sources. In...
Recent international PTA observations have provided compelling evidence for a primordial background gravitational wave, bringing its direct detection within reach. In light of this progress, we are planning precise measurements of the annual parallaxes of PTA pulsars in order to identify the astrophysical sources responsible for the background gravitational waves.
While the detection of the...
Employing effective field theory techniques, we advance computations of thermal parameters that enter predictions for the gravitational wave spectra from first-order electroweak phase transitions. Working with the real-singlet-extended Standard Model, we utilize recent lattice simulations to confirm the existence of first-order phase transitions across the free parameter space. For the first...
Pulsar Timing Arrays (PTAs) are entering a new era of nano-Hertz gravitational wave (GW) astronomy with evidence for a GW signal found in several PTA data sets, CPTA, EPTA, InPTA, NANOGrav, PPTA and MPTA. They are working together in the IPTA to combine the data sets and analyze the truely best upcoming global PTA data set, IPTA DR3, to be able to conclusively confirm the detection of...
Certain early-Universe scenarios predict a stochastic gravitational-wave background (SGWB) with nonzero circular polarization, making its detection a potentially powerful probe of parity-violating physics and the physics of the primordial Universe. In addition to polarization, the SGWB may exhibit anisotropies. A particularly well-motivated contribution is the kinematic dipole induced by the...
Gravitational-wave observations of compact-binary coalescences provide a direct measurement of luminosity distance. If the redshift of the source can also be determined, these events can be used as standard sirens to construct a Hubble diagram and probe the expansion history of the Universe. In practice, however, identifying the host galaxies of gravitational-wave sources is extremely...
