XV Black Holes Workshop

Session

Session 4 A

19 Dec 2022, 16:30

ISCTE - University Institute of Lisbon

113. H. Witek: CSI: Gravity -- investigating fundamental physics with black holes

19/12/2022, 16:30

The detection of 90 gravitational wave signals produced by coalescing black holes or neutron stars have opened a rich discovery space for astrophysics, fundamental physics and cosmology. In particular, they enable qualitatively new tests of gravity in its most extreme regime that unfolds when black holes collide. To link gravitational wave observations to the underlying theory of gravity we...

114. Z. Zhong: Piercing of a boson star by a black hole

19/12/2022, 16:45

New light fundamental fields are natural candidates for all or a fraction of dark matter. Self-gravitating structures of such fields might be common objects in the universe, and could comprise even galactic halos. These structures would interact gravitationally with black holes, a process of the utmost importance since it dictates their lifetime, the black hole motion, and possible...

115. N. Sanchis-Gual: The impact of the wavelike nature of Proca stars on their gravitational-wave emission

19/12/2022, 17:00

I will present a systematic study of the dynamics and gravitational-wave emission of head-on collisions of spinning vector boson stars, known as Proca stars. To this aim we build a catalogue of about 800 numerical-relativity simulations of such systems. We have found that the wave-like nature of bosonic stars has a large impact on the gravitational-wave emission. In particular, we show that...

116. M. Vaglio: Parameter estimation on boson-star binary signals with a model-based coherent inspiral template

19/12/2022, 17:15

Compact boson star solutions can be constructed on such a scale that binary systems emit gravitational waves in the same frequency range of stellar-mass black hole binaries. Nonetheless, already at the inspiral stage, the resulting signal is significantly different due to tidal and spin-induced effects which affect the waveform. We constructed a post-Newtonian expanded template for the...

117. R. Luna: Kicks in charged black hole binaries

19/12/2022, 17:30

We compute the emission of linear momentum (kicks) by both gravitational and electromagnetic radiation in fully general-relativistic numerical evolutions of quasi-circular charged black hole binaries. We derive analytical expressions for slowly moving bodies and explore numerically a variety of mass ratios and charge-to-mass ratios. We find that for the equal mass case our analytical...

118. A. Vaño-Viñuales: Towards causal visualization of collapsing hyperboloidal slices

19/12/2022, 17:45

Carter-Penrose diagrams are a useful tool to understand the causal properties of spacetimes. I will consider the spherically symmetric collapse of a massless scalar field in the context of numerical relativity. The evolution takes place on hyperboloidal slices, which are smooth and spacelike, and reach future null infinity. This is the collection of the endpoints of future-directed null...