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Spectator fields and their imprints on the Cosmic Microwave Background

Research output: Thesis › Doctoral Thesis

Published

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Spectator fields and their imprints on the Cosmic Microwave Background. / Wang, Lingfei.
Lancaster University, 2016. 182 p.

Research output: Thesis › Doctoral Thesis

Harvard

Wang, L 2016, 'Spectator fields and their imprints on the Cosmic Microwave Background', PhD, Lancaster University.

APA

Wang, L. (2016). Spectator fields and their imprints on the Cosmic Microwave Background. [Doctoral Thesis, Lancaster University]. Lancaster University.

Vancouver

Wang L. Spectator fields and their imprints on the Cosmic Microwave Background. Lancaster University, 2016. 182 p.

Author

Wang, Lingfei. / Spectator fields and their imprints on the Cosmic Microwave Background. Lancaster University, 2016. 182 p.

Bibtex

@phdthesis{21f28be34e94470f81e8c2a0129a2cf5,
title = "Spectator fields and their imprints on the Cosmic Microwave Background",
abstract = "When a subdominant light scalar field ends slow roll during inflation, but well after the Hubble exit of the pivot scales, it may determine the cosmological perturbations. This thesis investigates how such a scalar field, the spectator, may leave its impact on the Cosmic Microwave Background (CMB) radiation and be consequently constrained. We first introduce the observables of the CMB, namely the power spectrum Pζ , spectral index ns and its running dns/d ln k, the non-Gaussianities fNL, gNL and τNL, and the lack of isocurvature and polarization modes. Based on these studies, we derive the cosmological predictions for the spectator scenario, revealing its consistency with the CMB for inflection point potentials, hyperbolic tangent potentials, and those with a sudden phase transition. In the end, we utilize the spectator scenario to explain the CMB power asymmetry, with a brief tachyonic fast-roll phase.",
author = "Lingfei Wang",
year = "2016",
language = "English",
publisher = "Lancaster University",
school = "Lancaster University",

}

RIS

TY - BOOK

T1 - Spectator fields and their imprints on the Cosmic Microwave Background

AU - Wang, Lingfei

PY - 2016

Y1 - 2016

N2 - When a subdominant light scalar field ends slow roll during inflation, but well after the Hubble exit of the pivot scales, it may determine the cosmological perturbations. This thesis investigates how such a scalar field, the spectator, may leave its impact on the Cosmic Microwave Background (CMB) radiation and be consequently constrained. We first introduce the observables of the CMB, namely the power spectrum Pζ , spectral index ns and its running dns/d ln k, the non-Gaussianities fNL, gNL and τNL, and the lack of isocurvature and polarization modes. Based on these studies, we derive the cosmological predictions for the spectator scenario, revealing its consistency with the CMB for inflection point potentials, hyperbolic tangent potentials, and those with a sudden phase transition. In the end, we utilize the spectator scenario to explain the CMB power asymmetry, with a brief tachyonic fast-roll phase.

AB - When a subdominant light scalar field ends slow roll during inflation, but well after the Hubble exit of the pivot scales, it may determine the cosmological perturbations. This thesis investigates how such a scalar field, the spectator, may leave its impact on the Cosmic Microwave Background (CMB) radiation and be consequently constrained. We first introduce the observables of the CMB, namely the power spectrum Pζ , spectral index ns and its running dns/d ln k, the non-Gaussianities fNL, gNL and τNL, and the lack of isocurvature and polarization modes. Based on these studies, we derive the cosmological predictions for the spectator scenario, revealing its consistency with the CMB for inflection point potentials, hyperbolic tangent potentials, and those with a sudden phase transition. In the end, we utilize the spectator scenario to explain the CMB power asymmetry, with a brief tachyonic fast-roll phase.

M3 - Doctoral Thesis

PB - Lancaster University

ER -