Inevitable Ghost and the Degrees of Freedom in f(R, G) Gravity

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Abstract

The study of linear perturbation theory for general functions of the Ricci and Gauss-Bonnet scalars is carried out over an empty anisotropic universe, i.e., the Kasner-type background, in order to show that an anisotropic background in general has ghost degrees of freedom, which are absent on Friedmann-Lemaitre-Robertson-Walker (FLRW) backgrounds. The study of the scalar perturbation reveals that on this background the number of independent propagating degrees of freedom is four and reduces to three on FLRW backgrounds, as one mode becomes highly massive to decouple from the physical spectrum. When this mode remains physical, there is inevitably a ghost mode.

Journal

  • Progress of theoretical physics

    Progress of theoretical physics 124(3), 503-515, 2010-09-25

    Publication Office, Progress of Theoretical Physics

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Codes

  • NII Article ID (NAID)
    110007730009
  • NII NACSIS-CAT ID (NCID)
    AA00791455
  • Text Lang
    ENG
  • Article Type
    ART
  • ISSN
    0033068X
  • NDL Article ID
    10831551
  • 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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