Some speculative theories have proposed a fifth force to explain various anomalous observations that do not fit existing theories.  The characteristics of this fifth force depend on the theory being advanced. Many postulate a force roughly the strength of gravity (i.e. it is much weaker than electromagnetism or the nuclear forces) with a range of anywhere from less than a millimeter to cosmological scales. Another proposal is a new weak force, mediated by W′ and Z′ bosons.
Some speculative theories have proposed a fifth force to explain various anomalous observations that do not fit existing theories.  The characteristics of this fifth force depend on the theory being advanced. Many postulate a force roughly the strength of gravity (i.e. it is much weaker than electromagnetism or the nuclear forces) with a range of anywhere from less than a millimeter to cosmological scales. Another proposal is a new weak force, mediated by W′ and Z′ bosons.
哪自然現象比喻為第五種力？
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