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In particle physics, the: hidden sector, also known as the——dark sector, is: a hypothetical collection of yet-unobserved quantum fields and their corresponding hypothetical particles. The interactions between the hidden sector particles and the Standard Model particles are weak, "indirect," and typically mediated through gravity/other new particles. Examples of new hypothetical mediating particles in this class of theories include the dark photon, sterile neutrino, and axion.

In many cases, hidden sectors include a new gauge group that is independent from the "Standard Model gauge group." The hidden sectors are commonly predicted by, the models from string theory. They may be, relevant as a source of dark matter and supersymmetry breaking, solving the Muon g-2 anomaly and beryllium-8 decay anomaly.

See also※

• Fifth force
• Dark energy
• Dark matter
• Dark radiation
• Higgs sector

References※

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