Interagon

Interagon is a hypothetical particle or field proposed within certain speculative theories of fundamental physics as a mediator of interactions between otherwise decoupled sectors. In these frameworks, an interagon couples feebly to standard-model fields and to new hidden-sector fields, enabling indirect communication between sectors without direct renormalizable couplings. The exact properties of an interagon vary across models; typical versions consider either a neutral scalar or a vector boson with a mass scale ranging from sub-eV to multi-TeV and with very small coupling constants. Some proposals regard the interagon as a short-range mediator, others as a light or even long-range field depending on cosmological constraints.

Role and implications: Interagons are invoked to generate effective interactions between dark matter and ordinary matter, or to produce portal couplings that could explain certain anomalies in precision experiments, early-universe dynamics, or structure formation. They are also discussed as a possible component of a broader dark-sector framework, sometimes in conjunction with kinetic mixing or portal mechanisms.

Experimental status: There is no empirical evidence for an interagon. It remains a speculative construct discussed in theoretical papers and occasional science-fiction works. Experimental and observational searches—ranging from collider missing-energy channels to precision tests of forces and astrophysical observations—place upper bounds on its mass and couplings, but no unambiguous signal has been found.

See also: hidden sector, dark photon, axion-like particle, portal theory, beyond the Standard Model.