AST 347 - Undergrad Cosmology


Welcome to the home page for the course “Cosmology” (AST 347) in Fall 2021.

Lecturer:            Neelima Sehgal

Contact:             neelima.sehgal{at},    Office: 454 ESS

Class Times:     Tuesdays and Thursdays   8:00 - 9:20am   Room 069 ESS


Office Hours:    Thursdays 9:30 - 10:30am  ESS 454

Course grade:   Homework Problem Sets (15%)

                            Midterm Exam 1 (25%)

                            Midterm Exam 2 (25%)

                            Final Exam (35%)

Course Text Book: Introduction to Cosmology by Barbara Ryden

Class Structure: 

• Homework problem sets will be assigned on Tuesdays and are due the following Tuesday

• Midterm Exam 1 will be on Thursday October 7th

• Midterm Exam 2 will be on Thursday November 18th

• The Final Exam will be on Wednesday December 8th

• We will aim to cover roughly one chapter of the textbook per week

Topics to be Covered:

Fundamental Observations

Intro to Spacetime Curvature

Cosmic Dynamics

Single-Component Universes

Multi-Component Universes

Measuring Cosmological Parameters

Dark Matter

The Cosmic Microwave Background

Nucleosynthesis and the Early Universe

Inflation and the Very Early Universe

The Formation of Structure

Americans with Disabilities Act:

If you have a physical, psychological, medical or learning disability that may impact your course work, please contact Disability Support Services, ECC (Educational Communications Center) Building, room128, (631) 632-6748. They will determine with you what accommodations, if any, are necessary

and appropriate. All information and documentation is confidential.

Academic Integrity:

Each student must pursue his or her academic goals honestly and be personally accountable for all submitted work. Representing another person's work as your own is always wrong. Faculty are required to report any suspected instances of academic dishonesty to the Academic Judiciary.  Faculty in the Health Sciences Center (School of Health Technology & Management, Nursing, Social Welfare, Dental Medicine) and School of Medicine are required to follow their school-specific procedures.  For more comprehensive information on academic integrity, including categories of academic dishonesty, please refer to the academic judiciary website at

Critical Incident Management:

Stony Brook University expects students to respect the rights, privileges, and property of other people. Faculty are required to report to the Office of Judicial Affairs any disruptive behavior that interrupts their ability to teach, compromises the safety of the learning environment, or inhibits students' ability to learn.  Faculty in the HSC Schools and the School of Medicine are required to follow their school-specific procedures.