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Article Contents

ABSTRACT

1.INTRODUCTION

2.THE MYSTERIES
2.1.Classical vacuum energy
2.2.Quantum zero-point energy
2.3.The coincidence scandal

3.WHAT MIGHT BE GOING ON?
3.1.Are we misinterpreting the data?
3.2.Is general relativity breaking down?
3.3.Is dark energy dynamical?
3.4.Did we just get lucky?
3.5.Are we witnessing environmental selection?

4.OBSERVATIONAL ISSUES
4.1.Equation-of-state parameter
4.2.Direct detection of dark energy

5.CONCLUSIONS

REFERENCES