Stellar Systems Dynamics

Course objectives

GENERAL OBJECTIVES:: Providing a knowledge of astrophysical problems connected to the study of the gravitational potential. Such knowledge will leads the students to understand the calculation of a density profile starting from the gravitational potential and viceversa. Particular attention will be addressed to calculation of gravitational potential of a generic distribution of matter by a development in series of Legendre Polynomials. SPECIFIC OBJECTIVES: A - Knowledge and understanding OF 1) To know the properties of homogeneous spheroids OF 2) To understand the procedures underlying the calculation of the gravitational potential of any matter distribution by development in spherical harmonics. B - Application skills OF 3) To be able to calculate a development in spherical harmonics. C - Autonomy of judgment OF 4) To be able to integrate the knowledge acquired in order to apply them in the more general context connected with gravitational waves and cosmology D - Communication skills E - Ability to learn OF 5) Have the ability to consult scientific articles in order to independently investigate some topics introduced during the course.

Channel 1
MARCO MERAFINA Lecturers' profile

Program - Frequency - Exams

Course program
a) Theory of gravitational potential Potential energy and gravitational energy. Non spherical potentials, Kuzmin-Plummer models, logatithmic potentials. Axisymmetric systems. Triaxial systems. Disk potentials. b) Development in series of gravitational potential Fundamental solution of Legrendre equation. Harmonic functions. Legendre Polynomials and properties. Spherical harmonic functions and properties. Development in series of spherical harmonic for matter distributions. c) Mathematical Appendix Abel Equation. Elliptical integrals. Bessel functions. Analytical functions with complex variables. Residual theorem. Mittag-Leffler series. Spherical trigonometry.
Prerequisites
No pre-requisites
Books
- Binney e Tremaine "Galactic Dynamics" - Princeton - Lesson notes
Frequency
In presence and in remote connection (on demand)
Exam mode
The exam consists of an interview on the topics illustrated in the course. The student must show to be able to present a topic or repeat a calculation discussed during the course and to apply the learned methods to examples and situations similar to those already discussed. The evaluation will take into account: - the correctness of the exposed concepts; - the clarity and rigor of the presentation; - the capacity in the analytical development of the theory; - attitude in "problem solving" (method and results). The oral exam lasts about 30 minutes.
Lesson mode
The lecture format is through blackboard or projections on screen. Alternatively, through e-learning platform.
MARCO MERAFINA Lecturers' profile

Program - Frequency - Exams

Course program
a) Theory of gravitational potential Potential energy and gravitational energy. Non spherical potentials, Kuzmin-Plummer models, logatithmic potentials. Axisymmetric systems. Triaxial systems. Disk potentials. b) Development in series of gravitational potential Fundamental solution of Legrendre equation. Harmonic functions. Legendre Polynomials and properties. Spherical harmonic functions and properties. Development in series of spherical harmonic for matter distributions. c) Mathematical Appendix Abel Equation. Elliptical integrals. Bessel functions. Analytical functions with complex variables. Residual theorem. Mittag-Leffler series. Spherical trigonometry.
Prerequisites
No pre-requisites
Books
- Binney e Tremaine "Galactic Dynamics" - Princeton - Lesson notes
Frequency
In presence and in remote connection (on demand)
Exam mode
The exam consists of an interview on the topics illustrated in the course. The student must show to be able to present a topic or repeat a calculation discussed during the course and to apply the learned methods to examples and situations similar to those already discussed. The evaluation will take into account: - the correctness of the exposed concepts; - the clarity and rigor of the presentation; - the capacity in the analytical development of the theory; - attitude in "problem solving" (method and results). The oral exam lasts about 30 minutes.
Lesson mode
The lecture format is through blackboard or projections on screen. Alternatively, through e-learning platform.
  • Lesson code10620437
  • Academic year2025/2026
  • CourseAstrophysics and Cosmology
  • CurriculumSingle curriculum
  • Year1st year
  • Semester2nd semester
  • SSDFIS/05
  • CFU6