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Title: Observational constraints on non-canonical inflation
Author: Li, Sheng
Awarding Body: University of Sussex
Current Institution: University of Sussex
Date of Award: 2014
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This work concentrates on theoretical cosmology in the aspect of modelling the inflationary cosmology, and the central work investigates Non-Canonical inflation (NCI) through the Kinflation paradigm. In this work the objective NCI models can be classified to three classes which are summation-separable models, product-separable models and an ansatz for NCI models, respectively. For simplicity of discussion, the application of the methods, and also the generality of the resulting predictions, I studied NCI models which are associated with the single-term polynomial potential V (�) = A�m. By means of several methods, which include scalar field redefinition and the asymptotic method, as well as the efficient approximations such as slow-roll approximation, for the first time I formulated and revealed the degeneracy and the correlations for the model parameters, in for instance both the scalar potential and the kinetic energy for different investigated NCI models in the work. The work also introduces one developed code, namely Kinetic Model (KMC) for the considered NCI models which implements and extends the scope of ModeCode based on the CosmoMC packages from the conventional canonical inflation to the generic NCI models. The results from numerical exploration helps in illustrating the constraints on the model parameters without the limits of slow-roll assumptions, and the generated results present the consistency as well as similar correlations to those derived from theoretical calculations. Specifically, all investigated NCI models which are driven by a quartic potential ��4 present a novel explanation as a viable candidate theory in modelling our universe given the current high precise observational data, such as from Wilkinson Microwave Anisotropy Probe (WMAP) satellite and Planck satellite.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available
Keywords: QB0980 Cosmogony. Cosmology