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Li Tjonnie (KULeuven)03/11/2021, 09:40
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Giacomo Bruno (UCLouvain)03/11/2021, 09:50
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Archisman Ghosh (UGent)03/11/2021, 10:00
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Maxime Fays (ULiège)03/11/2021, 10:10
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Nick Van Remortel (University of Antwerp)03/11/2021, 10:20
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03/11/2021, 10:30
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Alberto Mariotti (VUB), Alexandre SEVRIN (Vrije Universiteit Brussel)03/11/2021, 10:40
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Geoffrey Compère (ULB), Nicolas Chamel, Sébastien Clesse (Université Libre de Bruxelles (ULB))03/11/2021, 10:50
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Ricardo Cabrita (UCLouvain)03/11/2021, 11:30
Phase cameras (PCs) - developed at Nikhef and recently installed at Advanced Virgo - are capable of probing wavefront amplitude and phase in 2D for any frequency. This allows for monitoring the frequencies used to generate the error signals to lock the interferometer. Additionally, the PC has been used in the past to inform on wavefront distortions due to thermal defects in the mirrors....
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Elvis Ferreira (UCLouvain)03/11/2021, 11:50
We are developing a Cryogenic Superconducting Inertial Sensor (CSIS) to be employed in the forthcoming Einstein Telescope (ET). The designed displacement sensitivity for this device is a few fm/√Hz at 0.5 Hz, which is 3 orders of magnitude more sensitive than the state-of-the-art. The sensor will open pathways to monitor low-vibration motions of cryocoolers applied to the penultimate stage of...
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Vincent Boudart (ULiège)03/11/2021, 12:10
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Nicolas Herman (UNamur)03/11/2021, 12:30
The possibility to detect gravitational waves (GW) from planetary-mass primordial black hole (PBH) binaries with electromagnetic (EM) detectors of high-frequency GWs is investigated. We consider two patented experimental designs, based on the inverse Gertsenshtein effect, in which incoming GWs passing through a static magnetic field induce EM excitations inside either a TM cavity or a TEM...
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Eleni Bagui (ULB)03/11/2021, 14:00
Primordial black holes (PBHs) with a wide mass distribution imprinted by the thermal history of the Universe, which naturally produces a high peak at the solar mass scale, could explain the gravitational-wave events seen by LIGO/Virgo and up to the totality of the dark matter. We show that compared to monochromatic or log-normal mass functions, the gravitational wave backgrounds (GWBs) from...
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Andrew Miller (UCLouvain)03/11/2021, 14:20
We present new constraints on the merging rates and abundance of planetary-mass and asteroid-mass inspiraling primordial black hole binaries using limits on continuous waves (quasi-monochromatic, quasi-infinte duration signals) derived from from all-sky searches for isolated compact objects in the first half of the third observing run (O3a) of LIGO/Virgo. We derive these rates in a...
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Disrael Cunha (UCLouvain)03/11/2021, 14:40
I will report the findings of 2104.14231. We computed the all-length scales unequal-time strain power spectrum and the energy density parameter of gravitational waves generated by various scaling sources, such as Cosmic Strings, showing that these exhibit a fine structure.
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Jishnu Suresh03/11/2021, 15:00
With the increasing sensitivities of the gravitational wave detectors and more detectors joining the international network, the chances of detection of a stochastic GW background (SGWB) are progressively increasing. Different astrophysical and cosmological processes are likely to give rise to backgrounds with distinct spectral signatures and distributions on the sky. The observed background...
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Kevin Turbang03/11/2021, 15:20
A gravitational wave background is expected to arise from the superposition of unresolved sources. Among these sources are black hole binaries, whose time domain signal is expected to be popcorn like, i.e. intermittent. The current search within the LVK collaboration does not consider this intermittent nature. We propose a new method to properly model the intermittency and thus, improve the...
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Kwinten Fransen (KULeuven)03/11/2021, 16:10
Rotating black holes in general relativity are notoriously simple objects. They can be fully fixed by measuring a single dominant (complex) characteristic frequency. Having determined this 'quasinormal mode' (QNM) frequency for the endstate of a binary merger, any additional information, from earlier binary dynamics or other QNMs, can serve as a test of our understanding of general relativity...
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Daniel Mayerson03/11/2021, 16:30
Equatorial symmetry – flipping the sign of the z coordinate – is a somewhat accidental symmetry of the Kerr black hole. There is no theorem guaranteeing its existence for a stationary black hole, as opposed to axisymmetry. Indeed, in many string theory black holes and horizonless compact objects, equatorial symmetry is generically broken. Somehow surprisingly, however, the possible observable...
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Cristian Joana03/11/2021, 16:50
In this talk, I will motivate the usage of numerical relativity for studies on the early universe. In particular, I will show simulations of the preinflationary epoch to prove the robustness of Higgs inflation to inhomogeneous initial conditions. Also, I will show ongoing preliminary results: full GR simulation of the reheating, and investigations on primordial black hole formation during the...
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03/11/2021, 17:10
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