## Abstract

The regularization and renormalization of an interacting scalar field φ in a curved spacetime background is performed by the method of continuation to n dimensions. In addition to the familiar counter terms of the flat-space theory, c-number, “vacuum” counter terms must also be introduced. These involve zero, first, and second powers of the Reimann curvature tensor R_{αβψδ}. Moreover, the renormalizability of the theory requires that the Lagrange function couple φ^{2} to the curvature scalar R with a coupling constant η. The coupling η must obey an inhomogeneous renormalization group equation, but otherwise it is an arbitrary, free parameter. All the counter terms obey renormalization group equations which determine the complete structure of these quantities in terms of the residues of their simple poles in n − 4. The coefficient functions of the counter terms determine the construction of φ^{2} and φ^{4} in terms of renormalized composite operators 1, [φ^{2}], and [φ^{4}]. Two of the counter terms vanish in conformally flat space-time. The others may be computed from the theory in purely flat space-time. They are determined, in a rather intricate fashion, by the additive renormalizations for two-point functions of [φ^{2}] and [φ^{4}] in Minkowski space-time. In particular, using this method, we compute the leading divergence of the R^{2} interaction which is of fifth order in the coupling constant λ.

Original language | English (US) |
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Pages (from-to) | 215-248 |

Number of pages | 34 |

Journal | Annals of Physics |

Volume | 130 |

Issue number | 1 |

DOIs | |

State | Published - Jan 1 1980 |

## All Science Journal Classification (ASJC) codes

- General Physics and Astronomy