Particle Production in Models with Helicity-0 Graviton Ghost in de Sitter Spacetime

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Abstract

We revisit the problem of the helicity-0 ghost mode of a massive graviton in the de Sitter background. In general, the presence of a ghost particle, which has negative energy, drives the vacuum to be unstable through the pair production of ghost particles and ordinary particles. In the case that the vacuum state preserves the de Sitter invariance, the number density created by the pair production inevitably diverges owing to unsuppressed ultraviolet (UV) contributions. In such cases, one can immediately conclude that the model is not viable. However, in the massive gravity theory, we cannot construct a vacuum state that respects the de Sitter invariance. Therefore, the presence of a ghost does not immediately mean the breakdown of the model. Explicitly estimating the number density and the energy density of particles created by the pair production of two conformal scalar particles and one helicity-0 ghost graviton, we find that these densities both diverge. However, since models with a helicity-0 ghost graviton have no de Sitter invariant vacuum state, it is rather natural to consider a UV cutoff scale in the three-dimensional momentum space. Then, even if we take a cutoff scale as large as the Planck scale, the created number density and energy density are well suppressed. In many models, the cutoff scale is smaller than the Planck scale. In such models, the created number density and energy density are negligible as long as only the physics below the cutoff scale is concerned.

Journal

  • Progress of Theoretical Physics

    Progress of Theoretical Physics 121(2), 427-436, 2009-02-25

    Published for the Yukawa Institute for Theoretical Physics and the Physical Society of Japan

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  • No de Sitter Invariant Vacuum in Massive Gravity Theory with Ghost

    IZUMI Keisuke , TANAKA Takahiro , Department of Physics Kyoto University , Yukawa Institute for Theoretical Physics Kyoto University

    Progress of Theoretical Physics 121(2), 419-426, 2009-02-25

    DOI  References (34) Cited by (1)

Codes

  • NII Article ID (NAID)
    110007339312
  • NII NACSIS-CAT ID (NCID)
    AA00791455
  • Text Lang
    ENG
  • Article Type
    ART
  • ISSN
    0033068X
  • NDL Article ID
    10162930
  • NDL Source Classification
    ZM35(科学技術--物理学)
  • NDL Call No.
    Z53-A468
  • Data Source
    CJP  NDL  NII-ELS 
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