Probing the Early Universe with the CMB Scalar, Vector and Tensor Bispectrum [electronic resource] / by Maresuke Shiraishi.

By: Shiraishi, Maresuke [author.]
Contributor(s): SpringerLink (Online service)
Material type: TextTextSeries: Springer Theses, Recognizing Outstanding Ph.D. Research: Publisher: Tokyo : Springer Japan : Imprint: Springer, 2013Description: XIII, 180 p. online resourceContent type: text Media type: computer Carrier type: online resourceISBN: 9784431541806Subject(s): Physics | Mathematical physics | Astronomy | Astrophysics | Cosmology | Physics | Astronomy, Astrophysics and Cosmology | Mathematical Methods in Physics | Mathematical Physics | Física y Astronomía | Física y AstronomíaAdditional physical formats: Printed edition:: No titleDDC classification: 520 LOC classification: QB1-991QB460-466QB980-991Online resources: Texto completo
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.
In: Springer eBooksSummary: 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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Item type Current location Shelving location Call number Status Date due Barcode Item holds
Springer (Colección 2013) Springer (Colección 2013) BIBLIOTECA GENERAL
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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.

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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