## Attraction-repulsion coupled and energy conserved universe

**Ti-Pei Li**

**The discovery of an accelerating cosmic expansion rate implies that, in addition to the attractive gravity of matter, there exist in our universe some other form of energy (dark energy or cosmological constant) producing a repulsive force.**

** The natural interpretation of dark energy is the vacuum energy.**

** However, the density of vacuum energy expected by the quantum field theory is 120 orders of magnitude larger than what allowed by cosmological observations, which is called the cosmological constant problem and remains one of the most significant unsolved problems in fundamental physics.**

** Here we show that the huge discrepancy between theoretical expectation and observational data can be resolved by assuming that our universe is an attraction-repulsion coupled system with energy conservation, and that the pre-inflation vacuum is in balance between attraction and repulsion (a flat Minkowski spacetime, not de Sitter or anti de Sitter).**

** The attraction-repulsion coupling picture can also easily explain why both kinds of energy in our universe have similar magnitude today, and avoid singularity problems in general relativity and cosmology…..**

Read more: http://arxiv.org

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