13 papers
Gravitational-wave constraints on the pair-instability mass gap and nuclear burning in massive stars
Fabio Antonini, Isobel Romero-Shaw, Thomas Callister +5
Pair-instability should prevent the direct formation of black holes above about creating a pair-instability mass gap. Yet gravitational-wave observations have detected…
Second-Generation Mass Peak in the Gravitational-Wave Population as a Probe of Globular Clusters
Yonadav Barry Ginat, Fabio Antonini, Elizabeth Flanagan +1
Gravitational-wave observations have revealed an excess of binary black hole mergers with primary masses near . We show that if this feature originates from dynam…
The Depletion of Collisionless Dark Matter Spikes
Charlie Sharpe, Yonadav Barry Ginat, Thomas F. M. Spieksma +1
Dense concentrations of dark matter (DM) surrounding black holes provide a compelling opportunity to probe the nature of DM. In the classic Gondolo-Silk model, the adiabatic growth…
Dynamical Evolution of Quasi-Hierarchical Triples
Yonadav Barry Ginat, Jakob Stegmann, Johan Samsing
We study the gravitational dynamics of quasi-hierarchical triple systems, where the outer orbital period is significantly longer than the inner one, but the outer orbit is extremel…
Apparent Dark-Energy Evolution from Cosmic Inhomogeneities
Yonadav Barry Ginat, Pedro G. Ferreira
A mildly inhomogeneous universe with a cosmological constant may look like it contains evolving dark energy. We show that could be the case by modelling the inhomogeneities and the…
Angular-momentum pairs in spherical systems: applications to the Galactic centre
Taras Panamarev, Yonadav Barry Ginat, Bence Kocsis
Consider a system of point masses in a spherical potential. In such systems objects execute planar orbits covering two-dimensional rings or annuli, represented by the angular-momen…