Lecture Notes:

Lecture 1

Lecture 2

Lecture 3

Lecture 4

References:

1. Peskin & Schroeder, An introduction to Quantum Field Theory.

2. Mukhanov, Physical foundation of Cosmology.

3. Feynman & Vernon, “The Theory of a general quantum system interacting with a linear dissipative system,” Annals Phys. 24 (1963) 118–173.

4. Veltman, “Diagrammatica: The Path to Feynman rules,” Cambridge Lect. Notes Phys. 4 (1994) 1–284.

5. Chou, Su & Lu Yu, Equilibrium and non-equilibrium formalisms made unified, Phys. Reports, 118 (1985) 1-131.

6. Kamenev, Field Theory of Non-Equilibrium Systems. Cambridge University Press, Cambridge, 1985.

7. Haehl, Loganayagam & Rangamani, “Schwinger-Keldysh formalism I: BRST symmetries and superspace," J. High Energ. Phys. (2017) 2017: 69.

8. Rivas & Huelga, Open Quantum Systems: An Introduction. SpringerBriefs in Physics, Springer Berlin Heidelberg, 2011.

9. Breuer & Petruccione, The theory of open quantum systems. Oxford, UK: Univ. Pr. (2002) 625 p, 2002.

10. Sieberer, Buchhold & S. Diehl, “Keldysh Field Theory for Driven Open Quantum Systems,” Reports on Progress in Physics, 79 (2016) 9.

11. Passarino & Veltman, “One Loop Corrections for e+ e- Annihilation Into mu+ mu-in the Weinberg Model,” Nucl. Phys. B160 (1979) 151-207.

12. Baidya, Jana, Loganayagam & Rudra, JHEP 1711 (2017) 204 .

13. Avinash, Jana, Loganayagam & Rudra, 'unpublished work'.