Probing the Early Universe with the CMB Scalar, Vector and Tensor Bispectrum

Probing the Early Universe with the CMB Scalar, Vector and Tensor Bispectrum

by Maresuke Shiraishi

Paperback(Softcover reprint of the original 1st ed. 2013)

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Overview

The non-Gaussianity in the primordial density fluctuations is a key feature to clarify the early Universe and it has been probed with the Cosmic Microwave Background (CMB) bispectrum. In recent years, we have treated the novel-type CMB bispectra, which originate from the vector- and tensor-mode perturbations and include the violation of the rotational or parity invariance.
On the basis of our current works, this thesis provides the general formalism for the CMB bispectrum sourced by the non-Gaussianity in the scalar, vector and tensor-mode perturbations. Applying this formalism, we calculate the CMB bispectra from the two scalars and a graviton correlation and primordial magnetic fields, and then outline new constraints on these magnitudes. Furthermore, this formalism can be easily extended to the cases where the rotational or parity invariance is broken. We also compute the CMB bispectra from the scalar-mode non-Gaussianities with a preferred direction and the tensor-mode non-Gaussianities induced by the parity-violating Weyl cubic terms. Here, we show that these bispectra include unique signals, which any symmetry-invariant models can never produce.

Product Details

ISBN-13: 9784431547167
Publisher: Springer Japan
Publication date: 08/06/2015
Series: Springer Theses
Edition description: Softcover reprint of the original 1st ed. 2013
Pages: 180
Product dimensions: 6.10(w) x 9.25(h) x (d)

About the Author

Dr. Maresuke Shiraishi
Department of Physics
Nagoya University

Table of Contents

Introduction.- Fluctuations in the inflation.- Fluctuations incosmic microwave background radiation.- Primordial non-Gaussianities.- General formalism for the CMB bispectrum from primordial scalar, vector and tensor non-Gaussianities.- CMB bispectrum Induced by the two scalars and a graviton correlator.- Violation of the rotational invariance in the CMB bispectrum.- Parity violation of gravitons in the CMB bispectrum.- CMB bispectrum generated from primordial magnetic fields.- Conclusion.

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