# Physical Processes in Astronomy

After a brief overview of vector calculus, integral theorems and coordinate transformations, this course takes on the dynamics of fluids, including collisionless ones. We derive the continuity, momentum & energy equations, discuss hydrostatic equilibrium, viscous flows, fluid instabilities, and focus on various astrophysical applications such as stellar structure and accretion disks. In the final part, we discuss thermal and non-thermal emission mechanisms, study the interaction of radiation and matter, delve into radiative transfer, and address statistical equilibrium.

**Lecture hours:** T-Th 4.00 – 5.15pm, classroom WTS A60

**Syllabus:** Click here for download

**Lecture Notes:** PDF document (210 pages). Click here for download

**Grading: – **35% final exam

– 30% midterm exam

– 35% problem sets

For more information, use the Yale Canvas System.

**Textbook(s)**

Although no textbook is required (detailed lecture notes are available), students are strongly encouraged to buy the textbook “The Physics of Fluids and Plasmas: An Introduction for Astrophysicists” by Arnab Rai Choudhuri, which covers most of the material covered in class and at the right level. Additional textbooks that are recommended are listed below:

**Problem Sets**

Problem sets (and their solutions) will be made available for download here.

Problem Set 1: due date Jan 22 [solutions]

Problem Set 2: due date Jan 31 [solutions]

Problem Set 3: due date Feb 14 [solutions]

Problem Set 4: due date Feb 28

Problem Set 5: due date TBD

NOTE: Don’t forget to indicate your name, staple your work, and always explain your answers to the problem sets. Points will be subtracted if you fail to explain how you came to the solution, even if it is correct.