PIRSA:10100071

Infrared instability of massless scalars in De Sitter space-time.

Dolgov, A. (2010). Infrared instability of massless scalars in De Sitter space-time. . Perimeter Institute. https://pirsa.org/10100071

Dolgov, Alexander. Infrared instability of massless scalars in De Sitter space-time. . Perimeter Institute, Oct. 28, 2010, https://pirsa.org/10100071 

          @misc{ pirsa_PIRSA:10100071,
            doi = {10.48660/10100071},
            url = {https://pirsa.org/10100071},
            author = {Dolgov, Alexander},
            keywords = {Cosmology},
            language = {en},
            title = {Infrared instability of massless scalars in De Sitter space-time. },
            publisher = {Perimeter Institute},
            year = {2010},
            month = {oct},
            note = {PIRSA:10100071 see, \url{https://pirsa.org}}
          }

Alexander Dolgov National Institute for Nuclear Physics

Talk numberPIRSA:10100071
DOI10.48660/10100071
Collection
Talk Type Conference
Subject

Abstract

Vacuum expectation value of the square of the quantum field operator of massless or light scalar field is calculated in the De Sitter space-time. The suggested method of calculation is different from the standard one used in the 80th. The calculations are heavily based on the De Sitter covarinace of the relevant quantities. The found result is significanlty different for the old one for the massless field but coinsides with the classical result for light massive field. Possible explanation of the dicrepancy by a spontaneous breaking of De Sitter invariance or by finite duration of the (quasi) De Sitter stage is discussed.