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Probing the Early Universe with the CMB Scalar, Vector and Tensor Bispectrum (Springer Theses)

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en Limba Engleză Carte Hardback – 29 Jul 2013
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.
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Specificații

ISBN-13: 9784431541790
ISBN-10: 4431541799
Pagini: 196
Dimensiuni: 155 x 235 x 16 mm
Greutate: 4.20 kg
Ediția: 2013
Editura: Springer
Colecția Springer
Seria Springer Theses

Locul publicării: Tokyo, Japan

Public țintă

Research

Cuprins

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.

Notă biografică

Dr. Maresuke Shiraishi
Department of Physics
Nagoya University

Textul de pe ultima copertă

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.

Caracteristici

Develops a complete formalism for the CMB bispectrum induced by the primordial non-Gaussianities

Provides novel constraints on the primordial non-Gaussianities composed of not only scalar but also vector- and tensor-mode fluctuations

Analyzes statistical anisotropy and parity violation in the CMB bispectrum

Nominated as an outstanding Ph.D thesis by Nagoya University's Physics Department in 2012