1.8k citations · 2.1k across the 5 of their papers we have counts for
7 papers
High-Order Multiderivative IMEX Schemes
Alexander J. Dittmann
Recently, a 4th-order asymptotic preserving multiderivative implicit-explicit (IMEX) scheme was developed (Schütz and Seal 2020, arXiv:2001.08268). This scheme is based on a 4th-or…
Modified Hermite Integrators of Arbitrary Order
Alexander J. Dittmann
We present a family of modified Hermite integrators of arbitrary order possessing superior behaviour for the integration of Keplerian and near-Keplerian orbits. After recounting th…
Constraining the Neutron Star Mass-Radius Relation and Dense Matter Equation of State with NICER. II. Emission from Hot Spots on a Rapidly Rotating Neutron Star
Slavko Bogdanov, Frederick K. Lamb, Simin Mahmoodifar +10
We describe the model of surface emission from a rapidly rotating neutron star that is applied to Neutron Star Interior Composition Explorer X-ray data of millisecond pulsars in or…
PSR J0030+0451 Mass and Radius from NICER Data and Implications for the Properties of Neutron Star Matter
M. C. Miller, F. K. Lamb, A. J. Dittmann +18
Neutron stars are not only of astrophysical interest, but are also of great interest to nuclear physicists, because their attributes can be used to determine the properties of the…
Star Formation in Accretion Disks and SMBH Growth
Alexander J. Dittmann, M. Coleman Miller
Accretion disks around active galactic nuclei are potentially unstable to star formation at large radii. We note that when the compact objects formed from some of these stars spira…
A Candidate Tidal Disruption Event in a Quasar at z=2.359 from Abundance Ratio Variability
Xin Liu, Alexander Dittmann, Yue Shen +1
A small fraction of quasars show an unusually high nitrogen-to-carbon ratio (N/C) in their spectra. These "nitrogen-rich" (N-rich) quasars are a long-standing puzzle because their…