Impact of ultraviolet regularization on the spectrum of curvature perturbations during inflation
- INAF/IASF-BO, Istituto di Astrofisica Spaziale e Fisica Cosmica di Bologna, via Gobetti 101, I-40129 Bologna (Italy)
Inflationary predictions based on the linear theory of cosmological perturbations are related to the two-point function of a (second quantized) real scalar free field during the accelerated stage. Such a two-point function is finite, in contrast with its coincidence limit, which is divergent due to the ultraviolet divergences proper of field theory. We therefore argue that predictions of most of the inflationary models do not necessarily need a regularization scheme to leading order, i.e. tree level, which is required instead for nonlinear corrections or calculations involving the energy-momentum tensor. We also discuss unpleasant features for the spectrum on demanding its regularization by the traditional fourth order adiabatic subtraction.
- OSTI ID:
- 21027821
- Journal Information:
- Physical Review. D, Particles Fields, Vol. 76, Issue 10; Other Information: DOI: 10.1103/PhysRevD.76.103528; (c) 2007 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 0556-2821
- Country of Publication:
- United States
- Language:
- English
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