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 spacetime 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 smallwavelength but largeamplitude 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.
https://uwaterloo.ca/physicsofinformationlab/teaching/quantumfieldtheorycosmologyamath872phys785w2024
https://pitp.zoom.us/j/96567241418?pwd=U3I1V1g4YXdaZ3psT1FrZUdlYm1zdz09
Format results

Quantum Field Theory for Cosmology  Lecture 20240109
Achim Kempf University of Waterloo

Quantum Field Theory for Cosmology  Lecture 20240111
Achim Kempf University of Waterloo

Quantum Field Theory for Cosmology  Lecture 20240116
Achim Kempf University of Waterloo

Quantum Field Theory for Cosmology  Lecture 20240118
Achim Kempf University of Waterloo

Quantum Field Theory for Cosmology  Lecture 20240123
Achim Kempf University of Waterloo

Quantum Field Theory for Cosmology  Lecture 20240125
Achim Kempf University of Waterloo

Quantum Field Theory for Cosmology  Lecture 20240130
Achim Kempf University of Waterloo

Quantum Field Theory for Cosmology  Lecture 20240201
Achim Kempf University of Waterloo

Quantum Field Theory for Cosmology  Lecture 20240206
Achim Kempf University of Waterloo

Quantum Field Theory for Cosmology  Lecture 20240208
Achim Kempf University of Waterloo

Quantum Field Theory for Cosmology  Lecture 20240213
Achim Kempf University of Waterloo

Quantum Field Theory for Cosmology  Lecture 20240215
Achim Kempf University of Waterloo