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Multi-Point Hermite Methods for the N-Body Problem
Alexander J. Dittmann
Numerical integration methods are central to the study of self-gravitating systems, particularly those comprised of many bodies or otherwise beyond the reach of analytical methods.…
A Semi-Analytical Model for Stellar Evolution in AGN Disks
Alexander J. Dittmann, Matteo Cantiello
Disks of gas accreting onto supermassive black holes may host numerous stellar-mass objects, formed within the disk or captured from a nuclear star cluster. We present a simplified…
Mapping the Outcomes of Stellar Evolution in the Disks of Active Galactic Nuclei
Gaia Fabj, Alexander J. Dittmann, Matteo Cantiello +2
The disks of Active Galactic Nuclei (AGNs) are expected to be populated by numerous stars, either formed in the outer regions of the disk via gravitational instability, or captured…
A More Precise Measurement of the Radius of PSR J0740+6620 Using Updated NICER Data
Alexander J. Dittmann, M. Coleman Miller, Frederick K. Lamb +9
PSR J0740+6620 is the neutron star with the highest precisely determined mass, inferred from radio observations to be . Measurements of its radius therefo…
Exploring Waveform Variations among Neutron Star Ray-tracing Codes for Complex Emission Geometries
Devarshi Choudhury, Anna L. Watts, Alexander J. Dittmann +8
Pulse Profile Modeling (PPM), the technique used to infer mass, radius and geometric parameters for rotation-powered millisecond pulsars using data from the Neutron Star Interior C…
The Effects of Cooling on Boundary Layer Accretion
Alexander J. Dittmann
In many cases accretion proceeds from disks onto planets, stars, white dwarfs, and neutron stars via a boundary layer, a region of intense shear where gas transitions from a near-K…