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We give a brief introduction into the formalism of the effective action. We use the effective action to investigate the stability of scalar quintessence potentials under quantum fluctuations both for uncoupled models and models with a coupling to fermions. We find that uncoupled models are usually stable in the late universe. However, a coupling to fermions is severely restricted. We check whether...
We give a brief introduction into the formalism of the effective action. We use the effective action to investigate the stability of scalar quintessence potentials under quantum fluctuations both for uncoupled models and models with a coupling to fermions. We find that uncoupled models are usually stable in the late universe. However, a coupling to fermions is severely restricted. We check...
The CMB data recently released by BOOMERANG and MAXIMA suggest that the anisotropy spectrum has a third peak in the range 800<l 3 <900. A<space>combination of this result with constraints from large-scale structure permit us to differentiate between different quintessence models. In particular, we find that inverse power law models with power α>1 are disfavoured. Models with...
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