Belgian Gravitational Wave Meeting - October 27 2020

Session

Neutron Star mergers and Fundamental Physics

27 Oct 2020, 16:10

Zoom

21. The \nu_R-philic scalar: its loop-induced interactions and Yukawa forces in LIGO observations

Xunjie Xu (ULB)

27/10/2020, 16:10

Right-handed neutrinos (νR) are often considered as a portal to new hidden physics. It is tempting to consider a gauge singlet scalar (ϕ) that exclusively couples to νR via a νRνRϕ term. Such a νR-philic scalar does not interact with charged fermions at tree level but loop-induced effective interactions are inevitable, which are systematically investigated in this work. The magnitude of the...

25. Properties of the secondary component of GW190814

Prasanta Char (ULiège)

27/10/2020, 16:30

We study the odds for the secondary component of GW190814 being a neutron star incorporating a large spin while also employing a stiff high density equation of state of nuclear matter. Since its mass resides $\in (2.50,2.67) M_\odot$, it could be the heaviest neutron star or the lightest black hole ever observed. Therefore, finding its true nature has far reaching implications on the...

26. The source of secondary peaks in the GW power spectral density from neutron star post-mergers

Matteo Lucca (ULB)

27/10/2020, 16:50

Although the main features of the evolution of binary neutron star (NS) systems are now well established, many details are still subject to debate, especially regarding the merger and post-merger phase. For instance, the precise mechanism responsible for the production of the secondary peaks in the observable gravitational wave (GW) power spectral density is still unclear. Thus, in order to...

27. Effects of dense matter properties on the tidal deformability and GW waveforms of neutrons star mergers

Loïc Perot (ULB)

27/10/2020, 17:10

Formed in gravitational core-collapse supernovae explosions, neutron stars are the most compact stars known in the universe: their average density exceeds than that found in atomic nuclei. The properties of the dense matter contained in their core are still poorly known. In this talk, I will present my first results about the role of the dense matter properties on the tidal deformability and...