Belgian Gravitational-Wave Meeting (ULB/VUB), Nov 3, 2021

Session

Gravitational-wave backgrounds: sources and analysis

3 Nov 2021, 14:00

Salle Solvay (Plaine, bât NO, 5th floor) (ULB)

13. A boosted gravitational wave background for primordial black holes with broad mass distributions and thermal features

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...

14. Direct constraints on planetary-mass primordial black holes using data from LIGO/Virgo's third observing run

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...

15. Interferences in the Stochastic Gravitational Wave Background

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.

16. Jointly setting upper limits on multiple components of a stochastic gravitational wave background

Jishnu Suresh

03/11/2021, 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...

17. A Search for Intermittent Gravitational Wave Backgrounds

Kevin Turbang

03/11/2021, 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...