When the primary star in a close binary system evolves into a giant and engulfs its
companion, its core and the companion temporarily orbit each other inside a common …

If a point mass moves through a uniform gas cloud, at what rate does it accrete material?
This is the question studied by Bondi, Hoyle and Lyttleton. This paper draws together the …

Stellar-mass primordial black holes (PBH) have been recently reconsidered as a dark matter
(DM) candidate after the aLIGO discovery of several binary black hole (BH) mergers with …

Rotation is thought to be a major factor in the evolution of massive stars—especially at low
metallicity—with consequences for their chemical yields, ionizing flux, and final fate …

We present a rapid binary-evolution algorithm that enables modelling of even the most
complex binary systems. In addition to all aspects of single-star evolution, features such as …

Mass accretion by black holes (BHs) is typically capped at the Eddington rate, when
radiation's push balances gravity's pull. However, even exponential growth at the Eddington …

While the formation of the first black holes (BHs) at high redshift is reasonably well
understood though debated, massive BH formation at later cosmic epochs has not been …

A theoretical model for quasi-spherical subsonic accretion on to slowly rotating magnetized
neutron stars is constructed. In this model, the accreting matter subsonically settles down on …

We introduce a new computational method for embedding Lagrangian sink particles into a
Eulerian calculation. Simulations of gravitational collapse or accretion generally produce …

Double black hole binaries are among the most important sources of gravitational radiation
for ground-based detectors such as LIGO or VIRGO. Even if formed with lower efficiency …