Electronic Resource

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

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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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Ketersediaan

Informasi Detail

Judul Seri

Springer Theses

No. Panggil

E1794

Penerbit

Tokyo : Springer., 2013

Deskripsi Fisik

xiii, 180 hlm.

Bahasa

English

ISBN/ISSN

9784431541806

Klasifikasi

NONE

Tipe Isi

text

Tipe Media

computer

Tipe Pembawa

online resource

Edisi

-

Subjek

Fisika : Metode Matematika
Astrofisika dan Kosmologi

Info Detail Spesifik

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Pernyataan Tanggungjawab

Maresuke Shiraishi

Versi lain/terkait

Lampiran Berkas

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