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Theory and phenomenology of quintessence

Doran, Michael

German Title: Theorie und Phenomenlogie der Quintessenz

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Translation of abstract (English)

We investigate cosmological models containing quintessence. Quintessence is a hypothetical form of energy distributed almost homogeneously throughout the Universe. We calculate cosmological perturbations and cosmic microwave background anisotropies using gauge-invariant variables. For many models, quintessence fluctuations follow simple power laws at early times. The implications of quintessence on the cosmic microwave background and the age of the universe are described via three intuitive parameters. We quantify the relation between the peaks in the multipole spectrum of the cosmic microwave background to the so called acoustic scale. We show that this acoustic scale is extractable from experimental data. Using this and constraints from structure formation, we considerably restrict two frequently used quintessence models. Quantum loop corrections to the classical quintessence potentials are calculated. From this, models with a coupling to dark matter become unlikely. Finally, we present cmbeasy, a computer code for calculating the cosmic microwave background anisotropies

Item Type: Dissertation
Supervisor: Wetterich, Prof. Dr. Christof
Date of thesis defense: 2. July 2002
Date Deposited: 25. Jul 2002 00:00
Date: 2002
Faculties / Institutes: The Faculty of Physics and Astronomy > Institute for Theoretical Physics
Subjects: 530 Physics
Controlled Keywords: Kosmologie, Kosmische Hintergrundstrahlung
Uncontrolled Keywords: Quintessenz , Dunkle Energiequintessence , dark energy , cosmic microwave background , perturbations
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