- Term: Winter 2022.
- Course codes: AMATH872 / PHYS785
- Instructor: Achim Kempf
- Prerequisite: AMATH673 or PHYS702 or consent of instructor. Some knowledge of general relativity.
- Time/venue: Mondays and Wednesdays (initially online) but now the lectures are in person, Mon+Wed, 4-5:20pm in the Bob room at Perimeter Institute.
- Reading week: no lectures Feb.19-27, 2022
- Discussions/tutorial with prof: Fridays 4-5pm in PI's Bob room, except: (via Zoom on March 25th).
- Office hours: by arrangement.
This course introduces quantum field theory from scratch and then develops the theory of the quantum fluctuations of fields and particles. We will focus, in particular, on how quantum fields are affected by curvature and by spacetime horizons. This will lead us to the Unruh effect, Hawking radiation and to inflationary cosmology. Inflationary cosmology, which we will study in detail, is part of the current standard model of cosmology which holds that all structure in the universe - such as the distribution of galaxies - originated in tiny quantum fluctuations of a scalar field and of space-time itself. For intuition, consider that quantum field fluctuations of significant amplitude normally occur only at very small length scales. Close to the big bang, during a brief initial period of nearly exponentially fast expansion (inflation), such small-wavelength but large-amplitude quantum fluctuations were stretched out to cosmological wavelengths. In this way, quantum fluctuations are thought to have seeded the observed inhomogeneities in the cosmic microwave background - which in turn seeded the condensation of hydrogen into galaxies and stars, all closely matching the increasingly accurate astronomical observations over recent years. The prerequisites for this course are a solid understanding of quantum theory and some basic knowledge of general relativity, such as FRW spacetimes.
- The grades will be based on a project.
- For the description of the project, click here. Part A is explained in some detail to get you started. In Part B you can give the project your own focus.
- Deadline (15-20 pages max, in pdf format): Friday, 29 April 2022, 6:00 pm
- Also: Brief summaries of a week's lectures (1/2 page per week) are to be submitted as a pdf file via email to the instructor:
- The summaries should be in full sentences, in your own words, concisely explaining what were the key points of the lectures.
- The homework will be graded pass/fail. The homework does not enter the calculation of the course grade.
- However, at least 8 of the 11 homework summaries need to be passes to pass the course.
- In your email's subject line, use the word "summary".
- Submissions are due Fridays 10pm to akempf at the usual uwaterloo.ca.:
14 Jan for Lectures 2+3
21 Jan for Lectures 4+5
28 Jan for Lectures 6+7
4 Feb for Lectures 8+9
11 Feb for Lectures 10+11
18 Feb for Lectures 12+13
*** reading week here ***
4 March for Lectures 14+15
11 March for Lectures 16+17
18 March for Lectures 18+19
25 March for Lectures 20 +21
1 April for Lectures 22+23
No summaries are to be submitted for lectures 1 and 24
Lectures (initially online) and lecture notes:
Announcement (25 Jan.): Preliminary indications from Perimeter Institute are that we will be able to move to in-class teaching from after reading week. I was also told that there is a chance that PI might open to us earlier.
From this time onward, our lectures will be in person in the Bob room.
- The recordings will stay online here.
- Do not come if you don't wish to come, have symptoms or have tested positive.
- Arrive early enough because you will probably need to do a rapid test at the reception.
Remark to those who are not enrolled: I invite anybody to download these lecture notes for study purposes and to view the recordings, even without being enrolled in the course. If you do, please send me an email though, I'd just like to know. Thanks!
To some extent, we will follow this textbook: V. Mukhanov, Sergei Winitzki, Introduction to Quantum Effects in Gravity, Cambridge University Press, June 2007. It has plenty of homework problems including solutions. I strongly recommend making use of them.
- N.D. Birrell, P.C.W. Davies, Quantum Fields in Curved Space, CUP, 1984.
- S.A. Fulling, Aspects of Quantum Field Theory in Curve Space-Time, CUP, 1989.
- A.R. Liddle, D. H. Lyth, Cosmological Inflation and Large-Scale Structure, CUP, 2000.
- T. Jacobson, Introduction to Quantum Fields in Curved Spacetime and the Hawking Effect, http://arxiv.org/abs/gr-qc/0308048
- L.H. Ford, Quantum Field Theory in Curved Spacetime, http://arxiv.org/abs/gr-qc/9707062