Conformally related early universe models can be told apart by the location of frame-invariant variables built from the time variation of particle and Planck masses.
Reconstruction of a Nonminimal Coupling Theory with Scale-invariant Power Spectrum
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abstract
A nonminimal coupling single scalar field theory, when transformed from Jordan frame to Einstein frame, can act like a minimal coupling one. Making use of this property, we investigate how a nonminimal coupling theory with scale-invariant power spectrum could be reconstructed from its minimal coupling counterpart, which can be applied in the early universe. Thanks to the coupling to gravity, the equation of state of our universe for a scale-invariant power spectrum can be relaxed, and the relation between the parameters in the action can be obtained. This approach also provides a means to address the Big-Bang puzzles and anisotropy problem in the nonminimal coupling model within Jordan frame. Due to the equivalence between the two frames, one may be able to find models that are free of the horizon, flatness, singularity as well as anisotropy problems.
fields
gr-qc 1years
2019 1verdicts
CONDITIONAL 1representative citing papers
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Towards degeneracy breaking of early universe models
Conformally related early universe models can be told apart by the location of frame-invariant variables built from the time variation of particle and Planck masses.