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01/03/2021 09:30
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Luc Blanchet01/03/2021 10:00
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Luciano Rezzolla01/03/2021 16:00
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Shinji Mukohyama02/03/2021 10:00
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Alessandra Buonanno02/03/2021 16:00
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Shinji Mukohyama03/03/2021 10:00
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David Shoemaker03/03/2021 16:00
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Alessandra Buonanno04/03/2021 10:00
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David Shoemaker04/03/2021 16:00
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Susanna Vergani05/03/2021 10:00
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05/03/2021 11:00
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Gabriele Vajente05/03/2021 16:00
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05/03/2021 17:00
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Monica Colpi08/03/2021 10:00
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Monica Colpi08/03/2021 16:00
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Danièle Steer09/03/2021 10:00
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Neil Cornish09/03/2021 16:00
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Giancarlo Ghirlanda10/03/2021 10:00
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Neil Cornish10/03/2021 16:00
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Giancarlo Ghirlanda11/03/2021 10:00
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Danièle Steer11/03/2021 16:00
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Germano Nardini12/03/2021 10:00
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12/03/2021 11:00
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Poster
The recent detections and data releases from LIGO-Virgo enable the first applications of statistical methods for constraining the Hubble parameter with Gravitational Waves (GWs).
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Moreover, they open up the possibility of new tests of General Relativity, since modified gravity models predict a non-standard GW luminosity distance, which is measured directly from the GW signal. By adding... -
Poster
We analyse various low-redshift cosmological data from Type-Ia Supernova, Baryon Acoustic Oscillations, Time-Delay measurements using Strong-Lensing, $H(z)$ measurements using Cosmic Chronometers and growth measurements from large scale structure observations for $\Lambda$CDM and some different dark energy models. By calculating the Bayesian Evidence for different dark energy models, we find...
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Poster
We develop new strategies to build numerical relativity surrogate models for
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eccentric binary black hole systems, which are expected to play an increasingly
important role in current and future gravitational-wave detectors. We
introduce a new surrogate waveform model, NRSur2dq1Ecc, using 47
nonspinning, equal-mass waveforms with eccentricities up to $0.2$ when measured
at a reference... -
Poster
We present GPE, a GPU-accelerated parameter estimation package for gravitational waves from compact binary coalescence sources. This stand-alone program is adapted from the nested sampling flavor of LALInference. Two main parallelization methods are implemented: (1) the frequency-domain waveform and likelihood calculations, (2) and the prior sampling portion in the nested sampling algorithm....
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If a star gets too close from a black hole (BH), the former can be disrupted by the tidal forces of the latter, resulting in a luminous event known as a tidal disruption event (TDE). Furthermore, the extreme nature of the system also results in the emission of gravitational waves, which carry additional informations about the properties of the BH and the star. As such, TDEs potentially allow...
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Poster
In this poster we introduce a new model free polarimetric analysis method based on quaternion Fourier transform and we also present a method to reconstruct both gravitational-wave polarizations from the full network data. Interestingly, this formalism allows to formulate generic priors on the polarization that can guide the problem inversion. As an illustration we perform the polarimetric...
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Poster
We sketch the inflationary predictions from a class of higher-curvature corrections to Starobinsky inflation and propose constraints on these theories, inspired by holography.
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Poster
We study an impact of asymmetric dark matter on properties of the neutron stars and their ability to reach the two solar masses limit, which allows us to present a new range of masses of dark matter particles and their fractions inside the star. Our analysis is based on the observational fact of the existence of two pulsars reaching this limit and on the theoretically predicted reduction of...
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Poster
Current gravitational-wave data analysis of merging binary black holes accounts for two precessing spins, allowing inference of the six spin degrees of freedom. Nonetheless, it is convenient to use effective parameters to interpret detections; the effective aligned spin $\chi_{\rm{eff}}$ and the effective precessing spin $\chi_{\rm{p}}$ measure components parallel and perpendicular to the...
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Monica Colpi
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Monica Colpi
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Danièle Steer
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Danièle Steer
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Prof. Neil Cornish (Montana State Univ.)
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Prof. Neil Cornish (Montana State Univ.)
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Prof. Neil Cornish (Montana State Univ.)
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David Shoemaker (MIT)
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David Shoemaker (MIT)
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David Shoemaker (MIT)
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Giancarlo Ghirlanda
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Giancarlo Ghirlanda
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Poster
The detection of gravitational waves (GWs) and an accompanying electromagnetic (E/M) counterpart have been suggested as a future probe for cosmology and theories of gravity. In this paper, we present calculations of the luminosity distance of sources taking into account inhomogeneities in the matter distribution that are predicted in numerical simulations of structure formation. In addition,...
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Poster
In this poster I present two recent works [1,2] that aim to enhance our understanding of reconstructing black hole space-times from different type of observations. While gravitational wave detectors like LIGO/Virgo allow to perform black hole spectroscopy of stellar mass black holes, images such as those produced by the Event Horizon Telescope provide information of the shadow from super...
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Poster
For nearly a century, Einstein’s theory of gravity has been the standard theory for describing gravitational phenomena in our universe. Along with its successes, there are some questions for which it does not provide a satisfactory answer. This has led to proposals that modify or supersede Einstein’s theory, and testing these theories against data, especially in the strong-field regime, has...
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Poster
Massive black holes, with masses ranging from tens of thousands to billions of solar masses are undeniably intertwined with their galactic hosts. There are a number of empirical relations linking central black holes with their galactic environment on both large and small scales, including bulge luminosities, stellar velocity dispersion or halo mass just to mention a few. Unfortunately, we are...
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Poster
We study hydrodynamical simulations of galaxy formation, based on the GADGET-3 code, and investigate supermassive black hole binaries coalescence at $5.5<z<14$ and the expected gravitational waves emitted from the binary mergers for different AGN feedback models. A fraction of the accreted rest-mass energy is radiated away by each BH. A fraction of this radiated energy is coupled to the...
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Poster
In our work ‘Revisiting a family of wormholes: geometry, matter, scalar quasi-normal modes and echoes (P.D.Roy, S. Aneesh, S. Kar, Eur. Phys. J. C (2020) 80: 850)’ we study the behavior of a family of ultrastatic, Lorentzian wormholes having two parameters, namely ‘n’ that controls the geometry of each member wormhole and throat radius ‘b_0’, under scalar perturbations. For n=2 ...
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Poster
We present algorithms (a) for nested neural likelihood-to-evidence ratio estimation, and (b) for simulation reuse via an inhomogeneous Poisson point process cache of parameters and corresponding simulations. Together, these algorithms enable automatic and extremely simulator efficient estimation of marginal and joint posteriors. The algorithms are applicable to a wide range of physics and...
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Poster
In the last few years, progressively more frequent and precise direct detections of gravitational waves have facilitated sensitive tests of general relativity. Among the most intriguing possibilities is the existence of horizonless objects more compact than the photon ring. If such objects exist, it is inevitable that in addition to a standard ringdown, there will be late-time echoes of...
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Poster
With the recent publication of the second gravitational wave transient catalog by the LIGO-Virgo collaboration (LVC), the number of binary compact object mergers has risen dramatically, from a dozen to ~ 50 events. From these detections, the LVC inferred the merger rate density both in the local Universe and as a function of redshift. It is then of foremost importance to compare the merger...
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Poster
The treatment and criteria for development of unstable Roche lobe overflow (RLOF) that leads to the common envelope (CE) phase have hindered the evolutionary predictions for decades. In particular, the formation of black hole–black hole (BH-BH), black hole–neutron star (BH-NS), and neutron star–neutron star (NS-NS) merging binaries depends sensitively on the CE phase in classical isolated...
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Poster
The coalescence of compact binary stars is expected to produce a stochastic background of gravitational waves (GW) observable with future GW detectors. Such backgrounds are usually characterized by their power spectrum as a function of frequency. Here, we present a method to calculate the full 1-point distribution of strain fluctuations. We focus on time series data, but our approach...
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Poster
With planned future gravitational wave observatories such as LISA and Einstein Telescope, coupled with powerful telescopes such as Euclid, it is vital we explore how these two windows into the content and dynamics of the Universe can complement one another. The weak lensing of gravitational waves found using luminosity distances obtained from compact binary coalescences, and redshifts from...
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Poster
One of the main questions of fundamental physics is the action of gravity on antimatter. We present here the simulation of the last part of the experiment GBAR at CERN, i.e. the measurement of the free fall acceleration 𝑔̅ of antihydrogen atoms in the gravitational field of Earth. A precision of the measurement beyond the % level is confirmed by taking into account the experimental design.
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