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The Intrinsic Bispectrum of the Cosmic Microwave Background

Part of the Springer Theses Book Series

DOI: 10.1007/978-3-319-21882-3

ISBN: 978-3-319-21881-6

Publisher: Springer International Publishing - Springer Journals

Aug 28, 2015

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Chapter 1Introduction

Pettinari, Guido Walter

Pages: 1 –8

[During the last three decades, cosmology has undergone a transition from a theory-dominated discipline to a data-driven science. Currently, numerous Earth and space-based experiments provide observers with a continuous flow of high precision data, allowing us to constrain and rule out many of...
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Chapter 2The Standard Model of Cosmology

Pettinari, Guido Walter

Pages: 9 –52

[Cosmologists are now converging towards a unified picture of the Universe, similar to when particle physicists built the standard model of particle physics. The standard model of cosmology depicts the Universe as a mixture of five known particle species (photons, neutrinos, electrons, protons...
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Chapter 3Perturbation Theory

Pettinari, Guido Walter

Pages: 53 –99

[There is a stark contrast between the smooth and homogeneous Universe predicted by the Big Bang theory and the most basic astronomical observations, which show that the visible matter is arranged in planets, stars and galaxies that cluster together. This disagreement can be overcome by adopting...
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Chapter 4The Boltzmann Equation

Pettinari, Guido Walter

Pages: 101 –146

[The Einstein equations are insufficient to describe the Universe unless we complement them with a model of its content. In this chapter we shall introduce the Boltzmann formalism, a statistical treatment of the Universe matter content that naturally coexists with general relativity. Each matter...
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Chapter 5Evolution of the Second-Order Perturbations

Pettinari, Guido Walter

Pages: 147 –196

[The Boltzmann equation dictates the evolution of the matter components of the Universe in an inhomogeneous Universe, while the Einstein equation describes how the curvature is affected by the distribution of matter, energy and momentum. In this chapter, we provide a numerical treatment of the...
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Chapter 6The Intrinsic Bispectrum of the CMB

Pettinari, Guido Walter

Pages: 197 –233

[The non-Gaussianity of the cosmic microwave background is a powerful probe of the physics of the early Universe. However, we do not expect all of the observed non-Gaussianity to be of primordial origin. The late-time non-linear effects described in the previous chapters will generate some degree...
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Chapter 7Conclusions

Pettinari, Guido Walter

Pages: 235 –239

[In this final short chapter we summarise the results of the thesis. The contamination from the intrinsic bispectrum generated by the non-linear effects generally leads to a small bias in the estimates of primordial non-Gaussianity. This is good news for the prospect of using CMB data to probe...

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