A5036255933- Pulsars and Gravitational Waves Research
- Gamma-ray bursts and supernovae
- Geophysics and Gravity Measurements
- Cosmology and Gravitation Theories
- Astrophysical Phenomena and Observations
- Radio Astronomy Observations and Technology
- Astrophysics and Cosmic Phenomena
- High-pressure geophysics and materials
- Seismic Waves and Analysis
- Geophysics and Sensor Technology
- Atomic and Subatomic Physics Research
- Statistical and numerical algorithms
- Magnetic confinement fusion research
- Seismology and Earthquake Studies
- Black Holes and Theoretical Physics
- Superconducting Materials and Applications
- Cold Atom Physics and Bose-Einstein Condensates
- Galaxies: Formation, Evolution, Phenomena
- Advanced Frequency and Time Standards
- Seismic Imaging and Inversion Techniques
- Relativity and Gravitational Theory
- Dark Matter and Cosmic Phenomena
- Computational Physics and Python Applications
- earthquake and tectonic studies
- Astronomical Observations and Instrumentation
Istituto Nazionale di Fisica Nucleare, Sezione di Roma I
2016-2024
Observatoire de la Côte d’Azur
2021-2024
Université Côte d'Azur
2021-2024
Centre National de la Recherche Scientifique
2019-2024
Université Paris Cité
2019-2024
Laboratoire AstroParticule et Cosmologie
2019-2024
University of Genoa
2023
Istituto Nazionale di Fisica Nucleare
2023
Ospedale Policlinico San Martino
2023
Sapienza University of Rome
2016-2021
The observation of binary neutron star merger GW170817, along with its optical counterpart, provided the first constraint on Hubble constant ${H}_{0}$ using gravitational wave standard sirens. When no counterpart is identified, a galaxy catalog can be used to provide necessary redshift information. However, true host might not contained in which complete out limit gravitational-wave detectability. These electromagnetic and selection effects must accounted for. We describe implement method...
ABSTRACT The mass, spin, and merger rate distribution of the binary black holes (BBHs) across cosmic redshifts provide a unique way to shed light on their formation channel. Along with redshift dependence BBH rate, mass BBHs can also exhibit due different channels metallicity parent stars. We explore jointly evolution from third gravitational wave (GW) catalogue GWTC-3 LIGO–Virgo–KAGRA collaboration. study possible connections between peak-like features in spectrum processes related...
\textit{Superradiance} can trigger the formation of an ultra-light boson cloud around a spinning black hole. Once formed, is expected to emit nearly periodic, long-duration, gravitational-wave signal. For masses in range $(10^{-13}-10^{-11})$ eV, and stellar mass holes, such signals are potentially detectable by gravitational wave detectors, like Advanced LIGO Virgo. In this {\it Letter} we present full band upper limits for generic all-sky search periodic waves O2 data, use them derive -...
Knowledge of the shape mass spectrum compact objects can be used to help break degeneracy between and redshift gravitational wave (GW) sources thus infer cosmological parameters in absence measurements obtained from electromagnetic observations. In this paper, we study extensively different aspects approach, including its computational limits achievable accuracy. Focusing on ground-based detectors with current future sensitivities, first perform analysis an extensive set simulated data using...
Abstract We outline the “dark siren” galaxy catalog method for cosmological inference using gravitational wave (GW) standard sirens, clarifying some common misconceptions in implementation of this method. When a confident transient electromagnetic counterpart to GW event is unavailable, identification unique host general challenging. Instead, as originally proposed by Schutz, one can consult and implement dark siren statistical approach incorporating all potential galaxies within...
Gravitational wave (GW) sources at cosmological distances can be used to probe the expansion rate of Universe. GWs directly provide a distance estimation source but no direct information on its redshift. The optimal scenario obtain redshift is through identification an electromagnetic (EM) counterpart and host galaxy. With almost 100 GW detected without EM counterparts (dark sirens), it becoming crucial have statistical techniques able perform studies in absence emission. Currently, only two...
Abstract In the absence of numerous gravitational-wave detections with confirmed electromagnetic counterparts, “dark siren” method has emerged as a leading technique cosmology. The allows redshift information such events to be inferred statistically from catalogue potential host galaxies. Due selection effects, dark siren analyses necessarily depend on mass distribution compact objects and evolution their merger rate redshift. Informative priors these quantities will impact posterior...
We present a comprehensive study of the effectiveness Convolution Neural Networks (CNNs) to detect long duration transient gravitational-wave signals lasting $O(hours-days)$ from isolated neutron stars. determine that CNNs are robust towards signal morphologies differ training set, and they do not require many injections/data guarantee good detection efficiency low false alarm probability. In fact, we only need train one CNN on signal/noise maps in single 150 Hz band; afterwards, can...
Gravitational wave echoes have been proposed as a smoking-gun signature of exotic compact objects with near-horizon structure. Recently there observational claims that are indeed present in stretches data from Advanced LIGO and Virgo immediately following gravitational signals presumed binary black hole mergers, well neutron star merger. In this paper we deploy morphology-independent search algorithm for introduced by Tsang et al. [Phys. Rev. D 98, 024023 (2018)], which (a) is able to...
The direct detection of gravitational waves by the LIGO/Virgo Collaboration has opened a new window with which to measure cosmological parameters such as Hubble constant ${H}_{0}$, and also probe general relativity on large scales. In this paper we present phenomenological approach, together its inferential implementation, for measuring deviations from (GR) scales concurrently determination ${H}_{0}$. We consider (GWs) propagating in an expanding homogeneous isotropic background, but...
Gravitational waves (GWs) from compact binary coalescences can constrain the cosmic expansion of Universe. In absence an associated electromagnetic counterpart, spectral siren method exploits relation between detector frame and source masses to jointly infer parameters mass distribution black holes (BHs) parameter ${H}_{0}$. This technique relies on choice parametrization for population BHs observed in hole mergers (BBHs). Using astrophysically motivated BBH populations, we study possible...
As a consequence of superradiant instability induced in Kerr black holes, ultralight boson clouds can be source persistent gravitational waves, potentially detectable by current and future gravitational-wave detectors. These signals have been predicted to nearly monochromatic, with small steady frequency increase (spin-up), but given the several assumptions simplifications done at theoretical level, it is wise consider, from data analysis point view, broader class which phase (or frequency)...
One of the open issues standard cosmological model is value cosmic dipole measured from Cosmic Microwave Background (CMB), as well number count quasars and radio sources. These measurements are currently in tension, with being 2-5 times larger than expected CMB measurements. This discrepancy has been pointed out a possible indication that principle not valid. In this paper, we explore possibility detecting estimating gravitational waves (GWs) compact binary mergers detected by future...
Continuous gravitational wave signals, like those expected by asymmetric spinning neutron stars, are among the most promising targets for LIGO and Virgo detectors. The development of fast robust data analysis methods is crucial to increase chances a detection. We have developed new flexible general framework search this kind which allows reduce computational cost about two orders magnitude with respect current procedures. This can correspond, at fixed computing cost, sensitivity gain up...
In this work we present the results of a search for continuous gravitational waves from Galactic Center using LIGO O2 data. The uses Band-Sampled-Data directed pipeline, which performs semi-coherent wide-parameter-space search, exploiting robustness FrequencyHough transform algorithm. targets signals emitted by isolated asymmetric spinning neutron stars, located within 25-150 parsecs Center. frequencies covered in range between 10 and 710 Hz with spin-down $-1.8\times10^{-9}$ to...
Since their first detection in 2015, gravitational wave observations have enabled a variety of studies, ranging from stellar evolution to fundamental physics. In this chapter, we focus on use as "standard sirens", describing the different methodologies that can be adopted measure cosmological parameters with compact object binaries ground-based detectors. We cover three main classes standard siren measurements, showing how expansion Universe constrained through Bayesian statistics both alone...
Exotic compact objects (ECOs) are a theorized class of that solve the paradoxes black holes by replacing event horizon with physical surface located at $r=r_+(1+\epsilon)$ from would-be $r_+$. Spinning horizonless prone to ergoregion instability, which would prevent their existence if spin is higher than critical threshold. In this paper, we set upper limits on population merging ECOs distribution binary coalescences (CBCs) detected LIGO, Virgo and KAGRA collaboration. Using measurements 104...
Rapidly rotating neutron stars are promising sources of continuous gravitational wave radiation for the LIGO and Virgo interferometers. The majority in our galaxy have not been identified with electromagnetic observations. All-sky searches isolated offer potential to detect waves from these unidentified sources. parameter space blind all-sky searches, which also cover a large range frequencies frequency derivatives, presents significant computational challenge. Different methods designed...
We describe a method to detect gravitational waves lasting $O(hours-days)$ emitted by young, isolated neutron stars, such as those that could form after supernova or binary star merger, using advanced LIGO/Virgo data. The is based on generalization of the FrequencyHough (FH), pipeline performs hierarchical searches for continuous mapping points in time/frequency plane detector lines frequency/spindown source. show signals whose spindowns are related their frequencies power law can be...
ABSTRACT With nearly a hundred gravitational wave detections, the origin of black hole mergers has become key question. Here, we focus on understanding typical galactic environment in which binary (BBH) arise. To this end, synthesize progenitors BBH as function redshift progenitor formation, present-day formation galaxy mass, and stellar metallicity for 240 star evolution models. We provide guidelines to infer properties time highlighting interplay between rate efficiency forming merging...
We present ICAROGW 2.0, a pure python code developed to infer the astrophysical and cosmological population properties of noisy, heterogeneous, incomplete observations. The has mainly been for compact binary coalescence (CBC) inference with gravitational wave (GW) It contains several models masses, spins, redshift CBC distributions it is able distributions, as well parameters possible general relativity deviations at scales. Here, we theoretical computational foundations 2.0 describe how can...
Gravitational waves from the coalescence of compact binaries, together with an associated electromagnetic counterpart, are ideal probes cosmological models. As demonstrated GW170817, such multimessenger observations allow one to use source as a standard siren, analog candles in conventional astronomy, order measure parameters Hubble constant. No ladder is needed estimate luminosity distance detected gravitational waves. The error on plays crucial role budget for inference In this paper, we...
Binary neutron star mergers offer a new and independent means of measuring the Hubble constant $H_0$ by combining gravitational-wave inferred source luminosity distance with its redshift obtained from electromagnetic follow-up. This method is limited intrinsic degeneracy between system orbital inclination in signal. Observing afterglow counterpart to merger can further constrain angle, allowing this be partially lifted improving measurement $H_0$. In case binary GW170817, light-curve imagery...