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14 papers · 2 filters
The fate of fallback matter around newly born compact objects
Rosalba Perna, Paul Duffell, Matteo Cantiello +1
The presence of fallback disks around young neutron stars has been invoked over the years to explain a large variety of phenomena. Here we perform a numerical investigation of the…
Binary Black Hole Accretion From a Circumbinary Disk: Gas Dynamics Inside the Central Cavity
Brian D. Farris, Paul Duffell, Andrew I. MacFadyen +1
We present the results of 2D hydrodynamical simulations of circumbinary disk accretion using the finite-volume code DISCO. This code solves the 2D viscous Navier-Stokes equations o…
GRB Afterglow Blast Wave Encountering Sudden Circumburst Density Change Produces No Flares
Ilana Gat, Hendrik van Eerten, Andrew MacFadyen
Afterglows of gamma-ray bursts are observed to produce light curves with the flux following power law evolution in time. However, recent observations reveal bright flares at times…
Tentative identification of the source of four UHECRs, and implications thereof
Glennys R. Farrar
Four UHECRs in the combined HiRes and AGASA datasets are backtracked in the Galactic magnetic field. They point to a common source which is localized to within 1 degree, if they ar…
A "Boosted Fireball" Model for Structured Relativistic Jets
Paul C. Duffell, Andrew I. MacFadyen
We present a model for relativistic jets which generates a particular angular distribution of Lorentz factor and energy per solid angle. We consider a fireball with specific intern…
Testing models of new physics with UHE air shower observations
Jeffrey Allen, Glennys Farrar
Several air shower observatories have established that the number of muons produced in UHE air showers is significantly larger than that predicted by models. We argue that the only…