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Title: The Cosmological Implications of Multiple Inflation
Author: Hunt, Paul
ISNI:       0000 0000 6548 7084
Awarding Body: University of Oxford
Current Institution: University of Oxford
Date of Award: 2006
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Multiple inflation is a natural consequence of supersymmetry, the most compelling extension to the standard model of particle physics. In the multiple inflation scenario one or more flat direction fields undergoes a symmetry breaking phase transition during inflation, triggered by the fall in temperature. We calculate the curvature perturbation spectrum using a WKB approach which goes beyond the standard slow-roll approximation. We find that each phase transition gives a step in the power spectrum with superimposed oscillations due to the motion of the flat direction as it settles into the potential minimum. We fit the multiple inflation model to recent cosmological observations using MCMC likelihood analysis, and investigate how assumptions made about the scale invariance of the power spectrum influence the inferred cosmological parameters. Our main result is that multiple inflation in an Einstein-de Sitter universe fits the WMAP data and SDSS matter power spectrum at least as well as the standard concordance model, without the need for a cosmological constant. Unfortunately, the position of the baryon peak in the SDSS LRG two-point correlation function seems to require a Hubble constant which is too high for an Einstein-de Sitter model, as we show.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available