The Vector Mode in the Second-order Cosmological Perturbation Theory
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Beschreibung
This thesis sheds valuable new light on the second-order cosmological perturbation theory, extensively discussing it in the context of cosmic microwave background (CMB) fluctuations. It explores the observational consequences of the second-order vector mode, and addresses magnetic field generation and the weak lensing signatures, which are key phenomena of the vector mode.
The author demonstrates that the second-order vector mode, which never appears at the linear-order level, naturally arises from the non-linear coupling of the first-order scalar modes. This leads to the remarkable statement that the vector-order mode clearly contributes to the generation of cosmological magnetic fields. Moreover, the weak lensing observations are shown to be accessible to the vector mode. On the basis of ongoing and forthcoming observations, the thesis concludes that the second-order vector mode is detectable.
Nominated as an outstanding PhD thesis by the Nagoya University, Japan Skillfully describes the development of the complete formalism for the second-order cosmological perturbation theory, involving vector and tensor modes Proposes a scenario of magnetic field generation in the second-order perturbation theory Quantifies the weak lensing signals from the second-order vector and tensor modes to provide forecasts for future experiments
Autor*in
Shohei Saga
Themen in »The Vector Mode in the Second-order Cosmological Perturbation Theory«
Cosmic Microwave Background Lensing Cosmological Vector Mode Primordial Magnetic Fields Magnetogenesis Weak Lensing 21cm Radiation Large-scale Structure of the Cosmos Cosmic Microwave Background Fluctuations