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Inflationary cosmology and the scale-invariant spectrum

McCabe, Gordon (2017) Inflationary cosmology and the scale-invariant spectrum. [Preprint]

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Abstract

The claim of inflationary cosmology to explain certain observable facts, which the Friedmann-Roberston-Walker models of `Big-Bang' cosmology were forced to assume, has already been the subject of significant philosophical analysis. However, the principal empirical claim of inflationary cosmology, that it can predict the scale-invariant power spectrum of density perturbations, as detected in measurements of the cosmic microwave background radiation, has hitherto been taken at face value by philosophers.

The purpose of this paper is to expound the theory of density perturbations used by inflationary cosmology, to assess whether inflation really does predict a scale-invariant spectrum, and to identify the assumptions necessary for such a derivation.

The first section of the paper explains what a scale invariant power-spectrum is, and the requirements placed on a cosmological theory of such density perturbations. The second section explains and analyses the concept of the Hubble horizon, and its behaviour within an inflationary space-time. The third section expounds the inflationary derivation of scale-invariance, and scrutinises the assumptions within that derivation. The fourth section analyses the explanatory role of `horizon-crossing' within the inflationary scenario.


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Item Type: Preprint
Creators:
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McCabe, Gordon
Keywords: Inflationary cosmology scale-invariant power spectrum perturbations Hubble horizon vacuum state
Subjects: Specific Sciences > Physics > Cosmology
Specific Sciences > Physics
Specific Sciences > Physics > Quantum Field Theory
Depositing User: Gordon McCabe
Date Deposited: 09 Aug 2017 17:08
Last Modified: 09 Aug 2017 17:08
Item ID: 13313
Subjects: Specific Sciences > Physics > Cosmology
Specific Sciences > Physics
Specific Sciences > Physics > Quantum Field Theory
Date: 7 August 2017
URI: https://philsci-archive-dev.library.pitt.edu/id/eprint/13313

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