Can inflation occur in anisotropic cosmologies?

Details Can inflation occur in anisotropic cosmologies? Can inflation occur in anisotropic cosmologies?

Nov 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986phlb..180...19r&link_type=abstract

Physics Letters B, Volume 180, Issue 1-2, p. 19-24.

Physics

57

Scientific paper

Several investigators have recently claimed to show that inflation takes place in all Bianchi models and that therefore anisotropy does not suppress inflation. It is shown here that these calculations are only valid in the zero-shear limit of orthogonal models (models without rotation and acceleration). However, the scalar field is not coupled to the fluid so a simple demonstration can be given that, within certain caveats, the results is nonetheless true. This demonstration is valid in all Bianchi classes except curvature-dominated type IX. A plausibility argument suggests that the conclusion will not hold in inhomogeneous cosmologies.

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