Adiabatic interpretation of particle creation in a de Sitter universe

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Description

The choice of vacuum state for a quantum scalar field propagating in a de Sitter spacetime (massive and arbitrarily coupled to the gravitational field) is discussed. The problem of finite-time initial conditions for the mode functions is analyzed, as well as how these determine the vacuum state of the quantum system. The principle guiding the choice of vacuum state is the following: one wants the vacuum contribution to the energy-momentum tensor to contain all the ultraviolet divergent terms, so that the particle creation terms are finite, and covariantly conserved. There is a suitable set of modes (instantaneous adiabatic basis) in ... continued below

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16 p.

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Molina-Paris, C. June 10, 1998.

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Description

The choice of vacuum state for a quantum scalar field propagating in a de Sitter spacetime (massive and arbitrarily coupled to the gravitational field) is discussed. The problem of finite-time initial conditions for the mode functions is analyzed, as well as how these determine the vacuum state of the quantum system. The principle guiding the choice of vacuum state is the following: one wants the vacuum contribution to the energy-momentum tensor to contain all the ultraviolet divergent terms, so that the particle creation terms are finite, and covariantly conserved. There is a suitable set of modes (instantaneous adiabatic basis) in which this splitting of the expectation value of the energy-momentum tensor can be carried out. Numerical results are presented for different finite-time initial conditions (m = 0.6, {zeta} = 1/6). The nature of the particle creation effect is described and its relationship to the concept of a horizon crossing time is shown. These numerical results imply that back-reaction can be important and should be the subject of further research.

Physical Description

16 p.

Notes

INIS; OSTI as DE99001252

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  • Other Information: PBD: 10 Jun 1998

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  • Other: DE99001252
  • Report No.: LA-UR--98-2676
  • Grant Number: W-7405-ENG-36
  • DOI: 10.2172/296829 | External Link
  • Office of Scientific & Technical Information Report Number: 296829
  • Archival Resource Key: ark:/67531/metadc687326

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Office of Scientific & Technical Information Technical Reports

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  • June 10, 1998

Added to The UNT Digital Library

  • July 25, 2015, 2:20 a.m.

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  • May 20, 2016, 2:14 p.m.

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Molina-Paris, C. Adiabatic interpretation of particle creation in a de Sitter universe, report, June 10, 1998; New Mexico. (digital.library.unt.edu/ark:/67531/metadc687326/: accessed October 19, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.