Are There Additional Space-Time Dimensions?
A promising, if challenging, theoretical approach to unification is string theory, which represents elementary particles as “musical notes” of tiny loops of energy, called strings, and which requires extra dimensions of space-time. These could have such small extent that they don’t affect us, but might explain why gravity is so much weaker than the other basic forces: perhaps its effect is spread over more than three dimensions. Experimenters are already searching for evidence of extra dimensions; for example, a loss of energy from high energy particle collisions. To include fermions (matter constituents) as well as bosons (force carriers) among the elementary particles it describes, a string theory must obey supersymmetry. This theory adds a boson partner for each fermion and a fermion partner for each boson and thus doubles the number of elementary particles. Most of the superpartners are expected to be too massive to produce with the energies available at today’s accelerators, but s
Related Questions
- For example what dimensions would make a 20 gallon sump/refugium (not including the additional height to prevent overflow due to a pump malfunction)?
- If I want to change the basic dimensions such as base width, height etc., would it mean much additional time and effort?
- Are there additional dimensions?
