Neutriinod

Neutriinod is a fictional particle concept used in speculative physics and some science fiction worlds. In this context, a neutriinod refers to a neutral fermion that is lighter than many known particles and interacts only very weakly with Standard Model matter through a hypothetical new mediator particle.

Theoretical basis and characteristics commonly ascribed to neutriinods involve extensions of the Standard Model that introduce a new gauge interaction or mixing with active neutrinos. A typical model envisions a light or ultra-light neutral fermion, which could be Dirac or Majorana, and a mediator such as a light X boson that couples primarily to the neutriinod and possibly to neutrinos. As a result, neutriinods would interact feebly with ordinary matter, making them challenging to detect directly.

Potential roles and implications discussed in speculative literature include serving as a component of dark matter, contributing to neutrino anomalies, or offering a portal to new physics beyond the Standard Model. Their production could occur in the early universe, in astrophysical environments, or in high-energy experiments, while signatures might include subtle distortions in beta-decay spectra, unusual neutrino oscillation patterns, or missing-energy events in collider-like settings. Because neutriinods are hypothetical, all proposed properties and experimental expectations are model-dependent, and no confirmed detections exist to date.

See also: neutrino, sterile neutrino, dark matter, physics beyond the Standard Model, new gauge boson.