Instability of Kaluza-Klein cosmology

Details Instability of Kaluza-Klein cosmology Instability of Kaluza-Klein cosmology

Sep 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987phlb..195..349s&link_type=abstract

Physics Letters B, Volume 195, Issue 3, p. 349-356.

Physics

15

Scientific paper

We show that cosmological solutions in Kaluza-Klein theory in more than five dimensions are unstable. This is due to the fact that the extra cosmic scale factors appearing in the metric ansatz act as scalar matter fields in the physical four-dimensional spacetime. These fields have physically unacceptable features: their kinetic energy can be negative and the energy spectrum is unbounded from below. To remove the defects a reinterpretation of the cosmological metric ansatz is necessary.

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