### Abstract

Two families of cosmological solutions are presented in D = 6, N = 2 Kaluza-Klein supergravity theories. One family, which applies to the case that the universe is in a vacuum state, includes the (Minkowski space-time)×(constant sphere S^{2}) solution. The case with four-dimensional radiation comprises the other family, which contains the (Friedmann universe)× (constant sphere S^{2}) solution. All solutions in the latter family approach the Friedmann universe asymptotically. The four-dimensional cosmological constant vanishes automatically without fine-tuning in both families of solutions.

Original language | English |
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Pages (from-to) | 358-362 |

Number of pages | 5 |

Journal | Physics Letters B |

Volume | 154 |

Issue number | 5-6 |

DOIs | |

Publication status | Published - 1985 May 9 |

Externally published | Yes |

### ASJC Scopus subject areas

- Nuclear and High Energy Physics

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## Cite this

Maeda, K., & Nishino, H. (1985). Cosmological solutions in D = 6, N = 2 Kaluza-Klein supergravity - The Friedmann universe without fine-tuning.

*Physics Letters B*,*154*(5-6), 358-362. https://doi.org/10.1016/0370-2693(85)90409-5