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Why is there no fifth fundamental force - Or should we keep looking?
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June 5th, 2009
According to the present understanding, there are four fundamental interactions or forces: gravitation, electromagnetism, the weak interaction, and the strong interaction. Their magnitude and behavior vary greatly. Modern physics attempts to explain every observed physical phenomenon by these fundamental interactions. Moreover, reducing the number of different interaction types is seen as desirable. Two cases in point are the unification of:
* Electric and magnetic force into electromagnetism;
* The electromagnetic interaction and the weak interaction into the electroweak interaction.
Could a fifth fundamental force help scientists develop a unified theory (sometimes called ToE, a Theory of Everything)? Or should we be grateful for having found only four because they are easier to unify?
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