Probing the early universe with the CMB scalar, vector and tensor bispectrum Maresuke Shiraishi

Format:

Book

Thesis/Dissertation

Author/Creator:

Shiraishi, Maresuke

Series:

Springer theses

Springer theses 2190-5053

Language:

English

Subjects (All):

Cosmic background radiation.

Genre:

dissertations

Academic theses

Physical Description:

1 online resource

Place of Publication:

Tokyo New York Springer ©2013

Summary:

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

Contents:

Introduction

Fluctuations in the inflation

Fluctuations in℗¡cosmic 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

Notes:

Ph. D. Nagoya University

Includes bibliographical references

"Doctoral thesis accepted by Nagoya University, Nagoya, Aichi, Japan"

Online resource; title from PDF title page (SpringerLink, viewed July 23, 2013)

Other Format:

Print version Shiraishi, Maresuke. Probing the Early Universe with the CMB Scalar, Vector and Tensor Bispectrum

ISBN:

9784431541806

4431541802

OCLC:

853506034

Access Restriction:

Restricted for use by site license