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The discovery of accelerated cosmic expansion implies that, in addition tothe attractive gravity of matter, there exists in our universe some other formof energy (dark energy or cosmological constant) producing a repulsive force.The natural interpretation of dark energy is the vacuum energy. However, thedensity of vacuum energy expected by the quantum field theory is 120 orders ofmagnitude larger than what is allowed by cosmological observations, which iscalled the cosmological constant problem and remains one of the mostsignificant unsolved problems in fundamental physics. Here we show that thehuge discrepancy can be resolved by assuming that our universe is anattraction-repulsion coupled system with energy conservation, and that thepre-inflation vacuum is in equilibrium between attraction and repulsion (inflat Minkowski spacetime, not de Sitter or anti de Sitter). Theattraction-repulsion coupling picture can also easily explain why both kinds ofenergy in our universe have similar magnitude today, and avoid singularityproblems in general relativity and cosmology.

Constructing a Robust Universe with Attraction-Repulsion Coupling and Energy Conservation