A search for transient reductions in the speed of sound of the inflaton in cosmological data, and other topics

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A search for transient reductions in the speed of sound of the inflaton in cosmological data, and other topics

Type: Doctoral Thesis
Title: A search for transient reductions in the speed of sound of the inflaton in cosmological data, and other topics
Author: Torrado Cacho, Jesús
Publisher: Theoretical Physics, Instituut-Lorentz, Faculty of Science, Leiden University
Issue Date: 2015-03-31
Keywords: Inflation
CMB speed sound reduction
Bispectrum
Heterotic string orbifold
EFT
Abstract: This thesis consists of two different parts, separating research projects carried out in two different groups. In the first and longest part of this thesis, we attempt to fit the signal for a reduction in the speed of sound of the inflaton. In chapter 1, we shortly introduce the topics discussed in this thesis, namely ΛCDM cosmology, transient reductions in the speed of sound during inflation, and Bayesian statistical inference. Afterwards, we attempt to fit a particular hypothesis for the speed of sound reduction using Cosmic Microwave Background data (chapter 2) and later adding Large Scale Structure data to the search (chapter 3). Finally, in chapter 4 we present two pieces of code that were elaborated for the research in this thesis, and later released to the community. In the second part, consisting solely of chapter 5, we present a classification of all possible 6-dimensional symmetric toroidal orbifolds over which Heterotic String Theory leads to a supersymmetric model. To do that, we made use of standard crystallographic tools.
Description: Promotor: Ana Achúcarro
With summary in Dutch
Faculty: Faculteit der Wiskunde en Natuurwetenschappen
Citation: Torrado Cacho, J., 2015, Doctoral thesis, Leiden University
Series/Report no.: Casimir PhD series;2015-4
ISBN: 9789085932123
Handle: http://hdl.handle.net/1887/32593
 

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application/pdf Title page_Contents_Foreword_Abbreviations 412.3Kb View/Open
application/pdf Part I 104.0Kb View/Open
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application/pdf Chapter 2 1.896Mb View/Open
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application/pdf Chapter 4 990.0Kb View/Open
application/pdf Part II 104.0Kb View/Open
application/pdf Chapter 5 1.007Mb View/Open
application/pdf Summary 195.4Kb View/Open
application/pdf Summary in Dutch 197.7Kb View/Open
application/pdf List of publica ... lum Vitae_Acknowledgements 193.7Kb View/Open
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