Instability and backreaction of spin-2 fields around black holes
William E. East, Nils Siemonsen
2309.05096 [gr-qc]
Pseudospectrum and Black Hole Quasinormal Mode Instability
José L Jaramillo, Rodrigo P Macedo, Lamis Al Sheikh
2004.06434 [gr-qc]
From 4-8 September 2023 the IST Astronomy Summer School gathered enthusiastic high school students to learn about astronomy. Amongst the activities there was a round table with the participation of our grup. The video link of the discussion can be found here.
Where and why does Einstein-Scalar-Gauss-Bonnet theory break down?
Abhishek Hegade K R, Justin L. Ripley, Nicolás Yunes
Static black binaries in de Sitter space
Óscar J. C. Dias, Gary W. Gibbons, Jorge E. Santos, and Benson Way
arXiv: 2303.07361v2
Gravitational-wave observations of extreme mass ratio inspirals (EMRIs) hold incredible potential to probe gravity, astrophysical and exotic environments. One of the main effects of astrophysical environments — in particular active galactic nuclei — is the torque exerted by their gaseous disk, which forces EMRIs to “migrate” (mostly) inward like planets.
Primordial black holes (PBHs) might form in the early universe and could comprise a significant fraction of the dark matter. If they are generated due to enhanced scalar perturbations at small scales, their formation is inevitably accompanied by the emission of gravitational waves (GWs) that could be seen by current and future GW experiments.
Ultralight dark matter is an exciting alternative to the standard cold dark matter paradigm, reproducing its large scale predictions, while solving most of its potential tension with small scale observations (like the "cusp-core" and "missing satellites" problems).
