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• W2531497643 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 $P_zeta$, spectral index $n_s$ and its running $dn_s/dln k$, the non-Gaussianities $f_{NL}$, $g_{NL}$ and $tau_{NL}$, 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." @default.
• W2531497643 created "2016-10-21" @default.
• W2531497643 creator A5069645037 @default.
• W2531497643 date "2016-10-10" @default.
• W2531497643 modified "2023-10-18" @default.
• W2531497643 title "Spectator fields and their imprints on the Cosmic Microwave Background" @default.
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