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Correlated perturbations from thermal dissipative inflation
Wolung Lee,Li-Zhi Fang 한국물리학회 2004 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.45 No.1
We study the primordial scalar perturbations in the thermal dissipative inflation where the thermal radiation persists and the density uctuations are thermally originated. The perturbation generated in this model is hybrid, i.e., it consists of both adiabatic and isocurvature components. We nd that the adiabatic and the isocurvature perturbations are correlated, even though the fluctuations of the radiation component is considered uncorrelated with that of the infaton. Furthermore, the correlation depends mainly on the ratio between the dissipation coefficient က and the Hubble parameter H during in ation and the predicted relation is consistent with the WMAP observation.
Da-Shin Lee,Li-Zhi Fang,Wolung Lee,Yeo-Yie Charng 한국물리학회 2004 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.45 No.1
We study the off-equilibrium effects of the in aton field on the dynamics of primordial perturbations in the O(N) model. A self-consistent off-equilibrium formalism is employed to investigate the evolution of the in ationary background eld and its uctuations with the back-reaction effects. We nd two observable remains left behind after the off-equilibrium processes: the running spectral index of primordial density perturbations and the correlations between perturbation modes in phase space, which can serve as the imprints to probe the epoch of in ation, and beyond.