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Related papers: A review of action estimation methods for galactic…

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A method is proposed for the determination of the position and inclination angles of the plane of a spiral galaxy based on the assumption that every spiral arm is a monotonic function of the radius versus azimuthal angle. This method may…

Astrophysics · Physics 2007-05-23 S. G. Poltorak , A. M. Fridman

Context: Dynamical studies of irradiated circumstellar disks require an accurate treatment of radiation transport to, for example, properly determine cooling and fragmentation properties. The radiation transport algorithm should be as fast…

Solar and Stellar Astrophysics · Physics 2013-06-20 Rolf Kuiper , Ralf S. Klessen

Charged particle motion in axisymmetric toroidal magnetic fields is analyzed within the context of the canonical Hamiltonian Guiding Center theory. A canonical transformation to variables measuring the drift orbit deviation from a magnetic…

Plasma Physics · Physics 2021-02-08 Yannis Antonenas , Giorgos Anastassiou , Yannis Kominis

The observed stellar kinematics of dispersion-supported galaxies are often used to measure dynamical masses. Recently, several analytical relationships between the stellar line-of-sight velocity dispersion, the projected (2D) or deprojected…

The numerical action variational principle is used to find fully nonlinear solutions for the orbits of the mass tracers given their present redshifts and angular positions and the cosmological boundary condition that the peculiar velocities…

Astrophysics · Physics 2009-10-28 Edward J. Shaya , P. J. E. Peebles , R. Brent Tully

We present an improved method for calculating the parallel and perpendicular velocity correlation functions directly from peculiar velocity surveys using weighted maximum-likelihood estimators. A central feature of the new method is the use…

Cosmology and Nongalactic Astrophysics · Physics 2021-09-29 Yuyu Wang , Sarah Peery , Hume A. Feldman , Richard Watkins

Spatially-resolved emission line kinematics are invaluable to investigating fundamental galaxy properties and have become increasingly accessible for galaxies at $z\gtrsim0.5$ through sensitive near-infrared imaging spectroscopy and…

Purpose: To develop a computationally viable autofocus method for estimating 3D rigid motion in MR imaging. Theory and Methods: The proposed method, REACT, assumes a piecewise-constant motion trajectory and estimates the rigid motion…

Image and Video Processing · Electrical Eng. & Systems 2026-03-25 Kwang Eun Jang , Dwight G. Nishimura

We introduce a novel dynamical model, named empirical triaxial orbit-superposition model, for the Milky Way halo. This model relies on minimal physical assumptions that the system is stationary, meaning the distribution function in 6D…

Astrophysics of Galaxies · Physics 2025-11-05 Ling Zhu , Xiang-Xiang Xue , Shude Mao , Chengqun Yang , Lan Zhang

We present Forstand, a new code for constructing dynamical models of galaxies with the Schwarzschild orbit-superposition method. These models are constrained by line-of-sight kinematic observations and applicable to galaxies of all…

Astrophysics of Galaxies · Physics 2020-02-05 Eugene Vasiliev , Monica Valluri

This paper presents an analytical model for collision probability assessments between de-orbiting or injecting space objects and satellite constellations. Considering the first to be subjected to a continuous tangential acceleration, its…

Instrumentation and Methods for Astrophysics · Physics 2023-05-15 Eduardo Maria Polli , Juan Luis Gonzalo , Camilla Colombo

This paper considers unconstrained convex optimization problems with time-varying objective functions. We propose algorithms with a discrete time-sampling scheme to find and track the solution trajectory based on prediction and correction…

Information Theory · Computer Science 2017-09-18 Andrea Simonetto , Aryan Mokhtari , Alec Koppel , Geert Leus , Alejandro Ribeiro

We shall define the oscillatory integrals by action integrals, Van Vleck determinant and Dewitt curvature. Our method employs action integrals along the shortest paths. We have the strong but not uniform convergence of time slicing Feynman…

Mathematical Physics · Physics 2015-01-16 Yoshihisa Miyanishi

Asymptotic theory for approximate martingale estimating functions is generalised to diffusions with finite-activity jumps, when the sampling frequency and terminal sampling time go to infinity. Rate optimality and efficiency are of…

Methodology · Statistics 2018-09-05 Nina Munkholt Jakobsen , Michael Sørensen

We have extended the spectral dynamics formalism introduced by Binney & Spergel, and have implemented a semi-analytic method to represent regular orbits in any potential, making full use of their regularity. We use the spectral analysis…

Astrophysics · Physics 2009-10-31 Y. Copin , H. S. Zhao , P. T. de Zeeuw

We are launching FindBounce, a Mathematica package for the evaluation of the Euclidean bounce action that enters the decay rate of metastable states in quantum and thermal field theories. It is based on the idea of polygonal bounces, which…

High Energy Physics - Phenomenology · Physics 2020-09-04 Victor Guada , Miha Nemevšek , Matevž Pintar

The presence of non-axisymmetric perturbations in an axisymmetric magnetic field equilibrium renders the Guiding Center (GC) particle motion non-integrable and may result in particle, energy and momentum redistribution, due to resonance…

Plasma Physics · Physics 2016-04-20 P. A. Zestanakis , Y. Kominis , G. Anastassiou , K. Hizanidis

The density of dark matter near the Sun is important for experiments hunting for dark matter particles in the laboratory, and for constraining the local shape of the Milky Way's dark matter halo. Estimates to date have typically assumed…

Astrophysics of Galaxies · Physics 2022-02-16 S. Sivertsson , J. I. Read , H. Silverwood , P. F. de Salas , K. Malhan , A. Widmark , C. F. P. Laporte , S. Garbari , K. Freese

In various fields of physics and astronomy, access to experimental facilities or to telescopes is becoming more and more competitive and limited. It becomes therefore important to optimize the type of measurements and their scheduling to…

Instrumentation and Methods for Astrophysics · Physics 2019-08-01 A. Hees , A. Dehghanfar , T. Do , A. M. Ghez , G. D. Martinez , R. Campbell , J. R. Lu

$Gaia$ DR2 has provided an unprecedented wealth of information about the positions and motions of stars in our Galaxy, and has highlighted the degree of disequilibria in the disc. As we collect data over a wider area of the disc it becomes…

Astrophysics of Galaxies · Physics 2020-07-15 Jason A. S. Hunt , Kathryn V. Johnston , Alex R. Pettitt , Emily C. Cunningham , Daisuke Kawata , David W. Hogg
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