Tracking Oscillating Energy

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  • 17 February 2000
Abstract
Recent cosmological observations strongly suggest that the Universe is dominated by an unknown form of energy with negative pressure. An intriguing suggestion is that this energy tracks the other forms of energy (e.g. matter, radiation) in the Universe, thereby explaining its closeness to the critical density today. In general tracking models fail, however, because (i) they give the wrong equation of state and (ii) they spoil the predictions of Big Bang Nucleosynthesis. We propose a class of models which track but can avoid these problems. These models require an oscillatory potential; the resultant field dynamics not only solves the missing energy problem but also leads to testable predictions in the Cosmic Microwave Background (CMB) and Large Scale Structure (LSS).

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