- About Us
- People
- Undergrad
- Graduate
- Research
- News & Events
-
News by Year
- 2022
- Physics Professors named Canada Research Chairs
- Physics Faculty and Graduate Student Win Teaching Awards
- SFU Physics Professor wins 2021 Buchalter Cosmology Prize
- Dr. Hayden's Research in SFU Scholarly Impact
- Karen Kavanagh selected as a Fellow of the MRS
- Applied Physics undergrad wins AMPP Poster Competition
- Physics BSc Grad Gives Convocation Address
- 2021
- Simmons wins Women of Distinction Award
- Pogosian's Research in SFU Scholarly Impact
- PhD Graduate Awarded Convocation Medal
- Convocation Speaker Aidan Wright
- Nancy Forde Elected BSC President
- Bechhoefer named Royal Society of Canada Fellow
- Jeff Sonier Named American Physical Society Fellow
- SFU undergrads receive quantum grant award
- 2020
- 2019
- 2018
- 2022
- Events by Year
- Events By Category
-
News by Year
- Outreach
- _how-to
- Congratulations to our Class of 2021
- Archive
Cosmology Seminar
Canonical Exorcism for Cosmological Ghosts
Alexander Vikman
IoP of the Czech Academy of Sciences
Canonical Exorcism for Cosmological Ghosts
Aug 04, 2016
Synopsis
We discuss time-dependent classical and quantum canonical transformation. In particular, we demonstrated that for the quantum canonical transformations the Hamiltonian is transformed as a connection in non-abelian gauge theories. We explicitly construct such quantum and classical transformations which change the sign the Hamiltonian. Hence one can canonically transform a ghost into a field with the correct standard sign in front of the quadratic action. Therefore the usual naive criteria for the presence or absence of ghost-like vacuum instabilities on time-dependent backgrounds are not well physically motivated and the actual information about instabilities is hidden in the interactions.
http://www.sfu.ca/physics-archive/cosmology/seminars/2016-08-04.html