Astronomical transients are signposts of catastrophic events in
space, including the most extreme stellar deaths, stellar tidal
disruptions by supermassive black holes, and mergers of compact
objects. Thanks to new and improved observational...
Abstract: I give new results for
"gravastars'', which are horizonless compact objects that closely
mimic mathematical black holes in their exterior geometry,
but for which g_{00} is always positive. They result
from solving the Tolman...
The magnetospheres and jets of black holes host
collisionless and highly magnetized plasmas. In such plasmas,
relativistic magnetic reconnection may catalyze the release of free
magnetic energy, powering quiescent and – especially – flaring
emission...
The Atacama Cosmology Telescope is a ground-based CMB survey
that has mapped half the millimeter sky at significantly higher
resolution and sensitivity than the Planck satellite. I will
present new ACT results from a 9400 sq.deg. gravitational...
Driven by gravity, galaxies continuously grow through accretion
of smaller systems. Stellar streams are nice illustrations of this
hierarchical build-up, but the accreted stars quickly disperse. I
will present advanced dynamical models that can...
Abstract: The Atacama Cosmology Telescope
is a ground-based CMB survey that has mapped half the millimeter
sky at significantly higher resolution and sensitivity than the
Planck satellite. I will present new ACT results from a 9400
sq.deg...
